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.TH "CMAKE-GENERATOR-EXPRESSIONS" "7" "Jul 19, 2023" "3.26.5" "CMake"
.SH NAME
cmake-generator-expressions \- CMake Generator Expressions
.SH INTRODUCTION
.sp
Generator expressions are evaluated during build system generation to produce
information specific to each build configuration.  They have the form
\fB$<...>\fP\&.  For example:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
target_include_directories(tgt PRIVATE /opt/include/$<CXX_COMPILER_ID>)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This would expand to \fB/opt/include/GNU\fP, \fB/opt/include/Clang\fP, etc.
depending on the C++ compiler used.
.sp
Generator expressions are allowed in the context of many target properties,
such as \fI\%LINK_LIBRARIES\fP, \fI\%INCLUDE_DIRECTORIES\fP,
\fI\%COMPILE_DEFINITIONS\fP and others.  They may also be used when using
commands to populate those properties, such as \fI\%target_link_libraries()\fP,
\fI\%target_include_directories()\fP, \fI\%target_compile_definitions()\fP
and others.  They enable conditional linking, conditional definitions used when
compiling, conditional include directories, and more.  The conditions may be
based on the build configuration, target properties, platform information,
or any other queryable information.
.sp
Generator expressions can be nested:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
target_compile_definitions(tgt PRIVATE
  $<$<VERSION_LESS:$<CXX_COMPILER_VERSION>,4.2.0>:OLD_COMPILER>
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The above would expand to \fBOLD_COMPILER\fP if the
\fI\%CMAKE_CXX_COMPILER_VERSION\fP is less
than 4.2.0.
.SH WHITESPACE AND QUOTING
.sp
Generator expressions are typically parsed after command arguments.
If a generator expression contains spaces, new lines, semicolons or
other characters that may be interpreted as command argument separators,
the whole expression should be surrounded by quotes when passed to a
command.  Failure to do so may result in the expression being split and
it may no longer be recognized as a generator expression.
.sp
When using \fI\%add_custom_command()\fP or \fI\%add_custom_target()\fP,
use the \fBVERBATIM\fP and \fBCOMMAND_EXPAND_LISTS\fP options to obtain robust
argument splitting and quoting.
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
# WRONG: Embedded space will be treated as an argument separator.
# This ends up not being seen as a generator expression at all.
add_custom_target(run_some_tool
  COMMAND some_tool \-I$<JOIN:$<TARGET_PROPERTY:tgt,INCLUDE_DIRECTORIES>, \-I>
  VERBATIM
)
.ft P
.fi
.UNINDENT
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
# Better, but still not robust. Quotes prevent the space from splitting the
# expression. However, the tool will receive the expanded value as a single
# argument.
add_custom_target(run_some_tool
  COMMAND some_tool \(dq\-I$<JOIN:$<TARGET_PROPERTY:tgt,INCLUDE_DIRECTORIES>, \-I>\(dq
  VERBATIM
)
.ft P
.fi
.UNINDENT
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
# Nearly correct. Using a semicolon to separate arguments and adding the
# COMMAND_EXPAND_LISTS option means that paths with spaces will be handled
# correctly. Quoting the whole expression ensures it is seen as a generator
# expression. But if the target property is empty, we will get a bare \-I
# with nothing after it.
add_custom_target(run_some_tool
  COMMAND some_tool \(dq\-I$<JOIN:$<TARGET_PROPERTY:tgt,INCLUDE_DIRECTORIES>,;\-I>\(dq
  COMMAND_EXPAND_LISTS
  VERBATIM
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Using variables to build up a more complex generator expression is also a
good way to reduce errors and improve readability.  The above example can be
improved further like so:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
# The $<BOOL:...> check prevents adding anything if the property is empty,
# assuming the property value cannot be one of CMake\(aqs false constants.
set(prop \(dq$<TARGET_PROPERTY:tgt,INCLUDE_DIRECTORIES>\(dq)
add_custom_target(run_some_tool
  COMMAND some_tool \(dq$<$<BOOL:${prop}>:\-I$<JOIN:${prop},;\-I>>\(dq
  COMMAND_EXPAND_LISTS
  VERBATIM
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
A common mistake is to try to split a generator expression across multiple
lines with indenting:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
# WRONG: New lines and spaces all treated as argument separators, so the
# generator expression is split and not recognized correctly.
target_compile_definitions(tgt PRIVATE
  $<$<AND:
      $<CXX_COMPILER_ID:GNU>,
      $<VERSION_GREATER_EQUAL:$<CXX_COMPILER_VERSION>,5>
    >:HAVE_5_OR_LATER>
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Again, use helper variables with well\-chosen names to build up a readable
expression instead:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
set(is_gnu \(dq$<CXX_COMPILER_ID:GNU>\(dq)
set(v5_or_later \(dq$<VERSION_GREATER_EQUAL:$<CXX_COMPILER_VERSION>,5>\(dq)
set(meet_requirements \(dq$<AND:${is_gnu},${v5_or_later}>\(dq)
target_compile_definitions(tgt PRIVATE
  \(dq$<${meet_requirements}:HAVE_5_OR_LATER>\(dq
)
.ft P
.fi
.UNINDENT
.UNINDENT
.SH DEBUGGING
.sp
Since generator expressions are evaluated during generation of the buildsystem,
and not during processing of \fBCMakeLists.txt\fP files, it is not possible to
inspect their result with the \fI\%message()\fP command.  One possible way
to generate debug messages is to add a custom target:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
add_custom_target(genexdebug COMMAND ${CMAKE_COMMAND} \-E echo \(dq$<...>\(dq)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
After running \fBcmake\fP, you can then build the \fBgenexdebug\fP target to print
the result of the \fB$<...>\fP expression (i.e. run the command
\fI\%cmake \-\-build ... \-\-target genexdebug\fP).
.sp
Another way is to write debug messages to a file with \fI\%file(GENERATE)\fP:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
file(GENERATE OUTPUT filename CONTENT \(dq$<...>\(dq)
.ft P
.fi
.UNINDENT
.UNINDENT
.SH GENERATOR EXPRESSION REFERENCE
.sp
\fBNOTE:\fP
.INDENT 0.0
.INDENT 3.5
This reference deviates from most of the CMake documentation in that it
omits angular brackets \fB<...>\fP around placeholders like \fBcondition\fP,
\fBstring\fP, \fBtarget\fP, etc.  This is to prevent an opportunity for those
placeholders to be misinterpreted as generator expressions.
.UNINDENT
.UNINDENT
.SS Conditional Expressions
.sp
A fundamental category of generator expressions relates to conditional logic.
Two forms of conditional generator expressions are supported:
.INDENT 0.0
.TP
.B $<condition:true_string>
Evaluates to \fBtrue_string\fP if \fBcondition\fP is \fB1\fP, or an empty string
if \fBcondition\fP evaluates to \fB0\fP\&.  Any other value for \fBcondition\fP
results in an error.
.UNINDENT
.INDENT 0.0
.TP
.B $<IF:condition,true_string,false_string>
New in version 3.8.

.sp
Evaluates to \fBtrue_string\fP if \fBcondition\fP is \fB1\fP, or \fBfalse_string\fP
if \fBcondition\fP is \fB0\fP\&.  Any other value for \fBcondition\fP results in an
error.
.UNINDENT
.sp
Typically, the \fBcondition\fP is itself a generator expression.  For instance,
the following expression expands to \fBDEBUG_MODE\fP when the \fBDebug\fP
configuration is used, and the empty string for all other configurations:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
$<$<CONFIG:Debug>:DEBUG_MODE>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Boolean\-like \fBcondition\fP values other than \fB1\fP or \fB0\fP can be handled
by wrapping them with the \fB$<BOOL:...>\fP generator expression:
.INDENT 0.0
.TP
.B $<BOOL:string>
Converts \fBstring\fP to \fB0\fP or \fB1\fP\&. Evaluates to \fB0\fP if any of the
following is true:
.INDENT 7.0
.IP \(bu 2
\fBstring\fP is empty,
.IP \(bu 2
\fBstring\fP is a case\-insensitive equal of
\fB0\fP, \fBFALSE\fP, \fBOFF\fP, \fBN\fP, \fBNO\fP, \fBIGNORE\fP, or \fBNOTFOUND\fP, or
.IP \(bu 2
\fBstring\fP ends in the suffix \fB\-NOTFOUND\fP (case\-sensitive).
.UNINDENT
.sp
Otherwise evaluates to \fB1\fP\&.
.UNINDENT
.sp
The \fB$<BOOL:...>\fP generator expression is often used when a \fBcondition\fP
is provided by a CMake variable:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
$<$<BOOL:${HAVE_SOME_FEATURE}>:\-DENABLE_SOME_FEATURE>
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Logical Operators
.sp
The common boolean logic operators are supported:
.INDENT 0.0
.TP
.B $<AND:conditions>
where \fBconditions\fP is a comma\-separated list of boolean expressions,
all of which must evaluate to either \fB1\fP or \fB0\fP\&.  The whole expression
evaluates to \fB1\fP if all conditions are \fB1\fP\&.  If any condition is \fB0\fP,
the whole expression evaluates to \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<OR:conditions>
where \fBconditions\fP is a comma\-separated list of boolean expressions.
all of which must evaluate to either \fB1\fP or \fB0\fP\&.  The whole expression
evaluates to \fB1\fP if at least one of the \fBconditions\fP is \fB1\fP\&.  If all
\fBconditions\fP evaluate to \fB0\fP, the whole expression evaluates to \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<NOT:condition>
\fBcondition\fP must be \fB0\fP or \fB1\fP\&.  The result of the expression is
\fB0\fP if \fBcondition\fP is \fB1\fP, else \fB1\fP\&.
.UNINDENT
.SS Primary Comparison Expressions
.sp
CMake supports a variety of generator expressions that compare things.
This section covers the primary and most widely used comparison types.
Other more specific comparison types are documented in their own separate
sections further below.
.SS String Comparisons
.INDENT 0.0
.TP
.B $<STREQUAL:string1,string2>
\fB1\fP if \fBstring1\fP and \fBstring2\fP are equal, else \fB0\fP\&.
The comparison is case\-sensitive.  For a case\-insensitive comparison,
combine with a \fI\%string transforming generator expression\fP\&.  For example, the following
evaluates to \fB1\fP if \fB${foo}\fP is any of \fBBAR\fP, \fBBar\fP, \fBbar\fP, etc.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
$<STREQUAL:$<UPPER_CASE:${foo}>,BAR>
.ft P
.fi
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B $<EQUAL:value1,value2>
\fB1\fP if \fBvalue1\fP and \fBvalue2\fP are numerically equal, else \fB0\fP\&.
.UNINDENT
.SS Version Comparisons
.INDENT 0.0
.TP
.B $<VERSION_LESS:v1,v2>
\fB1\fP if \fBv1\fP is a version less than \fBv2\fP, else \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<VERSION_GREATER:v1,v2>
\fB1\fP if \fBv1\fP is a version greater than \fBv2\fP, else \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<VERSION_EQUAL:v1,v2>
\fB1\fP if \fBv1\fP is the same version as \fBv2\fP, else \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<VERSION_LESS_EQUAL:v1,v2>
New in version 3.7.

.sp
\fB1\fP if \fBv1\fP is a version less than or equal to \fBv2\fP, else \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<VERSION_GREATER_EQUAL:v1,v2>
New in version 3.7.

.sp
\fB1\fP if \fBv1\fP is a version greater than or equal to \fBv2\fP, else \fB0\fP\&.
.UNINDENT
.SS String Transformations
.INDENT 0.0
.TP
.B $<LOWER_CASE:string>
Content of \fBstring\fP converted to lower case.
.UNINDENT
.INDENT 0.0
.TP
.B $<UPPER_CASE:string>
Content of \fBstring\fP converted to upper case.
.UNINDENT
.INDENT 0.0
.TP
.B $<MAKE_C_IDENTIFIER:...>
Content of \fB\&...\fP converted to a C identifier.  The conversion follows the
same behavior as \fI\%string(MAKE_C_IDENTIFIER)\fP\&.
.UNINDENT
.SS List Expressions
.INDENT 0.0
.TP
.B $<IN_LIST:string,list>
New in version 3.12.

.sp
\fB1\fP if \fBstring\fP is an item in the semicolon\-separated \fBlist\fP, else \fB0\fP\&.
It uses case\-sensitive comparisons.
.UNINDENT
.INDENT 0.0
.TP
.B $<JOIN:list,string>
Joins the list with the content of \fBstring\fP inserted between each item.
.UNINDENT
.INDENT 0.0
.TP
.B $<REMOVE_DUPLICATES:list>
New in version 3.15.

.sp
Removes duplicated items in the given \fBlist\fP\&. The relative order of items
is preserved, but if duplicates are encountered, only the first instance is
preserved.
.UNINDENT
.INDENT 0.0
.TP
.B $<FILTER:list,INCLUDE|EXCLUDE,regex>
New in version 3.15.

.sp
Includes or removes items from \fBlist\fP that match the regular expression
\fBregex\fP\&.
.UNINDENT
.SS Path Expressions
.sp
Most of the expressions in this section are closely associated with the
\fI\%cmake_path()\fP command, providing the same capabilities, but in
the form of a generator expression.
.sp
For all generator expressions in this section, paths are expected to be in
cmake\-style format. The \fI\%$<PATH:CMAKE_PATH>\fP
generator expression can be used to convert a native path to a cmake\-style
one.
.SS Path Comparisons
.INDENT 0.0
.TP
.B $<PATH_EQUAL:path1,path2>
New in version 3.24.

.sp
Compares the lexical representations of two paths. No normalization is
performed on either path. Returns \fB1\fP if the paths are equal, \fB0\fP
otherwise.
.sp
See \fI\%cmake_path(COMPARE)\fP for more details.
.UNINDENT
.SS Path Queries
.sp
These expressions provide the generation\-time capabilities equivalent to the
\fI\%Query\fP options of the \fI\%cmake_path()\fP command.
All paths are expected to be in cmake\-style format.
.INDENT 0.0
.TP
.B $<PATH:HAS_*,path>
New in version 3.24.

.sp
The following operations return \fB1\fP if the particular path component is
present, \fB0\fP otherwise. See \fI\%Path Structure And Terminology\fP for the
meaning of each path component.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
$<PATH:HAS_ROOT_NAME,path>
$<PATH:HAS_ROOT_DIRECTORY,path>
$<PATH:HAS_ROOT_PATH,path>
$<PATH:HAS_FILENAME,path>
$<PATH:HAS_EXTENSION,path>
$<PATH:HAS_STEM,path>
$<PATH:HAS_RELATIVE_PART,path>
$<PATH:HAS_PARENT_PATH,path>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Note the following special cases:
.INDENT 7.0
.IP \(bu 2
For \fBHAS_ROOT_PATH\fP, a true result will only be returned if at least one
of \fBroot\-name\fP or \fBroot\-directory\fP is non\-empty.
.IP \(bu 2
For \fBHAS_PARENT_PATH\fP, the root directory is also considered to have a
parent, which will be itself.  The result is true except if the path
consists of just a \fI\%filename\fP\&.
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:IS_ABSOLUTE,path>
New in version 3.24.

.sp
Returns \fB1\fP if the path is \fI\%absolute\fP, \fB0\fP otherwise.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:IS_RELATIVE,path>
New in version 3.24.

.sp
This will return the opposite of \fBIS_ABSOLUTE\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:IS_PREFIX[,NORMALIZE],path,input>
New in version 3.24.

.sp
Returns \fB1\fP if \fBpath\fP is the prefix of \fBinput\fP, \fB0\fP otherwise.
.sp
When the \fBNORMALIZE\fP option is specified, \fBpath\fP and \fBinput\fP are
\fI\%normalized\fP before the check.
.UNINDENT
.SS Path Decomposition
.sp
These expressions provide the generation\-time capabilities equivalent to the
\fI\%Decomposition\fP options of the \fI\%cmake_path()\fP
command.  All paths are expected to be in cmake\-style format.
.INDENT 0.0
.TP
.B $<PATH:GET_*,...>
New in version 3.24.

.sp
The following operations retrieve a different component or group of
components from a path. See \fI\%Path Structure And Terminology\fP for the
meaning of each path component.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
$<PATH:GET_ROOT_NAME,path>
$<PATH:GET_ROOT_DIRECTORY,path>
$<PATH:GET_ROOT_PATH,path>
$<PATH:GET_FILENAME,path>
$<PATH:GET_EXTENSION[,LAST_ONLY],path>
$<PATH:GET_STEM[,LAST_ONLY],path>
$<PATH:GET_RELATIVE_PART,path>
$<PATH:GET_PARENT_PATH,path>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
If a requested component is not present in the path, an empty string is
returned.
.UNINDENT
.SS Path Transformations
.sp
These expressions provide the generation\-time capabilities equivalent to the
\fI\%Modification\fP and \fI\%Generation\fP
options of the \fI\%cmake_path()\fP command.  All paths are expected to be
in cmake\-style format.
.INDENT 0.0
.TP
.B $<PATH:CMAKE_PATH[,NORMALIZE],path>
New in version 3.24.

.sp
Returns \fBpath\fP\&. If \fBpath\fP is a native path, it is converted into a
cmake\-style path with forward\-slashes (\fB/\fP). On Windows, the long filename
marker is taken into account.
.sp
When the \fBNORMALIZE\fP option is specified, the path is \fI\%normalized\fP after the conversion.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:APPEND,path,input,...>
New in version 3.24.

.sp
Returns all the \fBinput\fP arguments appended to \fBpath\fP using \fB/\fP as the
\fBdirectory\-separator\fP\&. Depending on the \fBinput\fP, the value of \fBpath\fP
may be discarded.
.sp
See \fI\%cmake_path(APPEND)\fP for more details.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:REMOVE_FILENAME,path>
New in version 3.24.

.sp
Returns \fBpath\fP with filename component (as returned by
\fB$<PATH:GET_FILENAME>\fP) removed. After removal, any trailing
\fBdirectory\-separator\fP is left alone, if present.
.sp
See \fI\%cmake_path(REMOVE_FILENAME)\fP for more details.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:REPLACE_FILENAME,path,input>
New in version 3.24.

.sp
Returns \fBpath\fP with the filename component replaced by \fBinput\fP\&. If
\fBpath\fP has no filename component (i.e. \fB$<PATH:HAS_FILENAME>\fP returns
\fB0\fP), \fBpath\fP is unchanged.
.sp
See \fI\%cmake_path(REPLACE_FILENAME)\fP for more details.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:REMOVE_EXTENSION[,LAST_ONLY],path>
New in version 3.24.

.sp
Returns \fBpath\fP with the \fI\%extension\fP removed, if any.
.sp
See \fI\%cmake_path(REMOVE_EXTENSION)\fP for more details.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:REPLACE_EXTENSION[,LAST_ONLY],path,input>
New in version 3.24.

.sp
Returns \fBpath\fP with the \fI\%extension\fP replaced by
\fBinput\fP, if any.
.sp
See \fI\%cmake_path(REPLACE_EXTENSION)\fP for more details.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:NORMAL_PATH,path>
New in version 3.24.

.sp
Returns \fBpath\fP normalized according to the steps described in
\fI\%Normalization\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:RELATIVE_PATH,path,base_directory>
New in version 3.24.

.sp
Returns \fBpath\fP, modified to make it relative to the \fBbase_directory\fP
argument.
.sp
See \fI\%cmake_path(RELATIVE_PATH)\fP for more
details.
.UNINDENT
.INDENT 0.0
.TP
.B $<PATH:ABSOLUTE_PATH[,NORMALIZE],path,base_directory>
New in version 3.24.

.sp
Returns \fBpath\fP as absolute. If \fBpath\fP is a relative path
(\fB$<PATH:IS_RELATIVE>\fP returns \fB1\fP), it is evaluated relative to the
given base directory specified by \fBbase_directory\fP argument.
.sp
When the \fBNORMALIZE\fP option is specified, the path is
\fI\%normalized\fP after the path computation.
.sp
See \fI\%cmake_path(ABSOLUTE_PATH)\fP for more details.
.UNINDENT
.SS Shell Paths
.INDENT 0.0
.TP
.B $<SHELL_PATH:...>
New in version 3.4.

.sp
Content of \fB\&...\fP converted to shell path style. For example, slashes are
converted to backslashes in Windows shells and drive letters are converted
to posix paths in MSYS shells. The \fB\&...\fP must be an absolute path.
.sp
New in version 3.14: The \fB\&...\fP may be a \fI\%semicolon\-separated list\fP
of paths, in which case each path is converted individually and a result
list is generated using the shell path separator (\fB:\fP on POSIX and
\fB;\fP on Windows).  Be sure to enclose the argument containing this genex
in double quotes in CMake source code so that \fB;\fP does not split arguments.

.UNINDENT
.SS Configuration Expressions
.INDENT 0.0
.TP
.B $<CONFIG>
Configuration name. Use this instead of the deprecated \fI\%CONFIGURATION\fP
generator expression.
.UNINDENT
.INDENT 0.0
.TP
.B $<CONFIG:cfgs>
\fB1\fP if config is any one of the entries in comma\-separated list
\fBcfgs\fP, else \fB0\fP\&. This is a case\-insensitive comparison. The mapping in
\fI\%MAP_IMPORTED_CONFIG_<CONFIG>\fP is also considered by this
expression when it is evaluated on a property of an \fI\%IMPORTED\fP
target.
.sp
Changed in version 3.19: Multiple configurations can be specified for \fBcfgs\fP\&.
CMake 3.18 and earlier only accepted a single configuration.

.UNINDENT
.INDENT 0.0
.TP
.B $<OUTPUT_CONFIG:...>
New in version 3.20.

.sp
Only valid in \fI\%add_custom_command()\fP and \fI\%add_custom_target()\fP
as the outer\-most generator expression in an argument.
With the \fI\%Ninja Multi\-Config\fP generator, generator expressions
in \fB\&...\fP are evaluated using the custom command\(aqs \(dqoutput config\(dq.
With other generators, the content of \fB\&...\fP is evaluated normally.
.UNINDENT
.INDENT 0.0
.TP
.B $<COMMAND_CONFIG:...>
New in version 3.20.

.sp
Only valid in \fI\%add_custom_command()\fP and \fI\%add_custom_target()\fP
as the outer\-most generator expression in an argument.
With the \fI\%Ninja Multi\-Config\fP generator, generator expressions
in \fB\&...\fP are evaluated using the custom command\(aqs \(dqcommand config\(dq.
With other generators, the content of \fB\&...\fP is evaluated normally.
.UNINDENT
.SS Toolchain And Language Expressions
.SS Platform
.INDENT 0.0
.TP
.B $<PLATFORM_ID>
The current system\(aqs CMake platform id.
See also the \fI\%CMAKE_SYSTEM_NAME\fP variable.
.UNINDENT
.INDENT 0.0
.TP
.B $<PLATFORM_ID:platform_ids>
\fB1\fP if CMake\(aqs platform id matches any one of the entries in
comma\-separated list \fBplatform_ids\fP, otherwise \fB0\fP\&.
See also the \fI\%CMAKE_SYSTEM_NAME\fP variable.
.UNINDENT
.SS Compiler Version
.sp
See also the \fI\%CMAKE_<LANG>_COMPILER_VERSION\fP variable, which is
closely related to the expressions in this sub\-section.
.INDENT 0.0
.TP
.B $<C_COMPILER_VERSION>
The version of the C compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<C_COMPILER_VERSION:version>
\fB1\fP if the version of the C compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<CXX_COMPILER_VERSION>
The version of the CXX compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<CXX_COMPILER_VERSION:version>
\fB1\fP if the version of the CXX compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<CUDA_COMPILER_VERSION>
New in version 3.15.

.sp
The version of the CUDA compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<CUDA_COMPILER_VERSION:version>
New in version 3.15.

.sp
\fB1\fP if the version of the CXX compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJC_COMPILER_VERSION>
New in version 3.16.

.sp
The version of the OBJC compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJC_COMPILER_VERSION:version>
New in version 3.16.

.sp
\fB1\fP if the version of the OBJC compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJCXX_COMPILER_VERSION>
New in version 3.16.

.sp
The version of the OBJCXX compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJCXX_COMPILER_VERSION:version>
New in version 3.16.

.sp
\fB1\fP if the version of the OBJCXX compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<Fortran_COMPILER_VERSION>
The version of the Fortran compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<Fortran_COMPILER_VERSION:version>
\fB1\fP if the version of the Fortran compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<HIP_COMPILER_VERSION>
New in version 3.21.

.sp
The version of the HIP compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<HIP_COMPILER_VERSION:version>
New in version 3.21.

.sp
\fB1\fP if the version of the HIP compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<ISPC_COMPILER_VERSION>
New in version 3.19.

.sp
The version of the ISPC compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<ISPC_COMPILER_VERSION:version>
New in version 3.19.

.sp
\fB1\fP if the version of the ISPC compiler matches \fBversion\fP, otherwise \fB0\fP\&.
.UNINDENT
.SS Compiler Language And ID
.sp
See also the \fI\%CMAKE_<LANG>_COMPILER_ID\fP variable, which is closely
related to most of the expressions in this sub\-section.
.INDENT 0.0
.TP
.B $<C_COMPILER_ID>
CMake\(aqs compiler id of the C compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<C_COMPILER_ID:compiler_ids>
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the C compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<CXX_COMPILER_ID>
CMake\(aqs compiler id of the CXX compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<CXX_COMPILER_ID:compiler_ids>
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the CXX compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<CUDA_COMPILER_ID>
New in version 3.15.

.sp
CMake\(aqs compiler id of the CUDA compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<CUDA_COMPILER_ID:compiler_ids>
New in version 3.15.

.sp
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the CUDA compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJC_COMPILER_ID>
New in version 3.16.

.sp
CMake\(aqs compiler id of the OBJC compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJC_COMPILER_ID:compiler_ids>
New in version 3.16.

.sp
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the Objective\-C compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJCXX_COMPILER_ID>
New in version 3.16.

.sp
CMake\(aqs compiler id of the OBJCXX compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<OBJCXX_COMPILER_ID:compiler_ids>
New in version 3.16.

.sp
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the Objective\-C++ compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<Fortran_COMPILER_ID>
CMake\(aqs compiler id of the Fortran compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<Fortran_COMPILER_ID:compiler_ids>
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the Fortran compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<HIP_COMPILER_ID>
New in version 3.21.

.sp
CMake\(aqs compiler id of the HIP compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<HIP_COMPILER_ID:compiler_ids>
New in version 3.21.

.sp
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the HIP compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<ISPC_COMPILER_ID>
New in version 3.19.

.sp
CMake\(aqs compiler id of the ISPC compiler used.
.UNINDENT
.INDENT 0.0
.TP
.B $<ISPC_COMPILER_ID:compiler_ids>
New in version 3.19.

.sp
where \fBcompiler_ids\fP is a comma\-separated list.
\fB1\fP if CMake\(aqs compiler id of the ISPC compiler matches any one
of the entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<COMPILE_LANGUAGE>
New in version 3.3.

.sp
The compile language of source files when evaluating compile options.
See \fI\%the related boolean expression\fP
\fB$<COMPILE_LANGUAGE:language>\fP
for notes about the portability of this generator expression.
.UNINDENT
.INDENT 0.0
.TP
.B $<COMPILE_LANGUAGE:languages>
New in version 3.3.

.sp
Changed in version 3.15: Multiple languages can be specified for \fBlanguages\fP\&.
CMake 3.14 and earlier only accepted a single language.

.sp
\fB1\fP when the language used for compilation unit matches any of the
comma\-separated entries in \fBlanguages\fP, otherwise \fB0\fP\&. This expression
may be used to specify compile options, compile definitions, and include
directories for source files of a particular language in a target. For
example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_executable(myapp main.cpp foo.c bar.cpp zot.cu)
target_compile_options(myapp
  PRIVATE $<$<COMPILE_LANGUAGE:CXX>:\-fno\-exceptions>
)
target_compile_definitions(myapp
  PRIVATE $<$<COMPILE_LANGUAGE:CXX>:COMPILING_CXX>
          $<$<COMPILE_LANGUAGE:CUDA>:COMPILING_CUDA>
)
target_include_directories(myapp
  PRIVATE $<$<COMPILE_LANGUAGE:CXX,CUDA>:/opt/foo/headers>
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This specifies the use of the \fB\-fno\-exceptions\fP compile option,
\fBCOMPILING_CXX\fP compile definition, and \fBcxx_headers\fP include
directory for C++ only (compiler id checks elided).  It also specifies
a \fBCOMPILING_CUDA\fP compile definition for CUDA.
.sp
Note that with \fI\%Visual Studio Generators\fP and \fI\%Xcode\fP there
is no way to represent target\-wide compile definitions or include directories
separately for \fBC\fP and \fBCXX\fP languages.
Also, with \fI\%Visual Studio Generators\fP there is no way to represent
target\-wide flags separately for \fBC\fP and \fBCXX\fP languages.  Under these
generators, expressions for both C and C++ sources will be evaluated
using \fBCXX\fP if there are any C++ sources and otherwise using \fBC\fP\&.
A workaround is to create separate libraries for each source file language
instead:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(myapp_c foo.c)
add_library(myapp_cxx bar.cpp)
target_compile_options(myapp_cxx PUBLIC \-fno\-exceptions)
add_executable(myapp main.cpp)
target_link_libraries(myapp myapp_c myapp_cxx)
.ft P
.fi
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B $<COMPILE_LANG_AND_ID:language,compiler_ids>
New in version 3.15.

.sp
\fB1\fP when the language used for compilation unit matches \fBlanguage\fP and
CMake\(aqs compiler id of the \fBlanguage\fP compiler matches any one of the
comma\-separated entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&. This expression
is a short form for the combination of \fB$<COMPILE_LANGUAGE:language>\fP and
\fB$<LANG_COMPILER_ID:compiler_ids>\fP\&. This expression may be used to specify
compile options, compile definitions, and include directories for source
files of a particular language and compiler combination in a target.
For example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_executable(myapp main.cpp foo.c bar.cpp zot.cu)
target_compile_definitions(myapp
  PRIVATE $<$<COMPILE_LANG_AND_ID:CXX,AppleClang,Clang>:COMPILING_CXX_WITH_CLANG>
          $<$<COMPILE_LANG_AND_ID:CXX,Intel>:COMPILING_CXX_WITH_INTEL>
          $<$<COMPILE_LANG_AND_ID:C,Clang>:COMPILING_C_WITH_CLANG>
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This specifies the use of different compile definitions based on both
the compiler id and compilation language. This example will have a
\fBCOMPILING_CXX_WITH_CLANG\fP compile definition when Clang is the CXX
compiler, and \fBCOMPILING_CXX_WITH_INTEL\fP when Intel is the CXX compiler.
Likewise, when the C compiler is Clang, it will only see the
\fBCOMPILING_C_WITH_CLANG\fP definition.
.sp
Without the \fBCOMPILE_LANG_AND_ID\fP generator expression, the same logic
would be expressed as:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
target_compile_definitions(myapp
  PRIVATE $<$<AND:$<COMPILE_LANGUAGE:CXX>,$<CXX_COMPILER_ID:AppleClang,Clang>>:COMPILING_CXX_WITH_CLANG>
          $<$<AND:$<COMPILE_LANGUAGE:CXX>,$<CXX_COMPILER_ID:Intel>>:COMPILING_CXX_WITH_INTEL>
          $<$<AND:$<COMPILE_LANGUAGE:C>,$<C_COMPILER_ID:Clang>>:COMPILING_C_WITH_CLANG>
)
.ft P
.fi
.UNINDENT
.UNINDENT
.UNINDENT
.SS Compile Features
.INDENT 0.0
.TP
.B $<COMPILE_FEATURES:features>
New in version 3.1.

.sp
where \fBfeatures\fP is a comma\-separated list.
Evaluates to \fB1\fP if all of the \fBfeatures\fP are available for the \(aqhead\(aq
target, and \fB0\fP otherwise. If this expression is used while evaluating
the link implementation of a target and if any dependency transitively
increases the required \fI\%C_STANDARD\fP or \fI\%CXX_STANDARD\fP
for the \(aqhead\(aq target, an error is reported.  See the
\fI\%cmake\-compile\-features(7)\fP manual for information on
compile features and a list of supported compilers.
.UNINDENT
.SS Linker Language And ID
.INDENT 0.0
.TP
.B $<LINK_LANGUAGE>
New in version 3.18.

.sp
The link language of the target when evaluating link options.
See \fI\%the related boolean expression\fP \fB$<LINK_LANGUAGE:languages>\fP
for notes about the portability of this generator expression.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
This generator expression is not supported by the link libraries
properties to avoid side\-effects due to the double evaluation of
these properties.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B $<LINK_LANGUAGE:languages>
New in version 3.18.

.sp
\fB1\fP when the language used for link step matches any of the comma\-separated
entries in \fBlanguages\fP, otherwise \fB0\fP\&.  This expression may be used to
specify link libraries, link options, link directories and link dependencies
of a particular language in a target. For example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(api_C ...)
add_library(api_CXX ...)
add_library(api INTERFACE)
target_link_options(api   INTERFACE $<$<LINK_LANGUAGE:C>:\-opt_c>
                                    $<$<LINK_LANGUAGE:CXX>:\-opt_cxx>)
target_link_libraries(api INTERFACE $<$<LINK_LANGUAGE:C>:api_C>
                                    $<$<LINK_LANGUAGE:CXX>:api_CXX>)

add_executable(myapp1 main.c)
target_link_options(myapp1 PRIVATE api)

add_executable(myapp2 main.cpp)
target_link_options(myapp2 PRIVATE api)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This specifies to use the \fBapi\fP target for linking targets \fBmyapp1\fP and
\fBmyapp2\fP\&. In practice, \fBmyapp1\fP will link with target \fBapi_C\fP and
option \fB\-opt_c\fP because it will use \fBC\fP as link language. And \fBmyapp2\fP
will link with \fBapi_CXX\fP and option \fB\-opt_cxx\fP because \fBCXX\fP will be
the link language.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
To determine the link language of a target, it is required to collect,
transitively, all the targets which will be linked to it. So, for link
libraries properties, a double evaluation will be done. During the first
evaluation, \fB$<LINK_LANGUAGE:..>\fP expressions will always return \fB0\fP\&.
The link language computed after this first pass will be used to do the
second pass. To avoid inconsistency, it is required that the second pass
do not change the link language. Moreover, to avoid unexpected
side\-effects, it is required to specify complete entities as part of the
\fB$<LINK_LANGUAGE:..>\fP expression. For example:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib STATIC file.cxx)
add_library(libother STATIC file.c)

# bad usage
add_executable(myapp1 main.c)
target_link_libraries(myapp1 PRIVATE lib$<$<LINK_LANGUAGE:C>:other>)

# correct usage
add_executable(myapp2 main.c)
target_link_libraries(myapp2 PRIVATE $<$<LINK_LANGUAGE:C>:libother>)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
In this example, for \fBmyapp1\fP, the first pass will, unexpectedly,
determine that the link language is \fBCXX\fP because the evaluation of the
generator expression will be an empty string so \fBmyapp1\fP will depends on
target \fBlib\fP which is \fBC++\fP\&. On the contrary, for \fBmyapp2\fP, the first
evaluation will give \fBC\fP as link language, so the second pass will
correctly add target \fBlibother\fP as link dependency.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B $<LINK_LANG_AND_ID:language,compiler_ids>
New in version 3.18.

.sp
\fB1\fP when the language used for link step matches \fBlanguage\fP and the
CMake\(aqs compiler id of the language linker matches any one of the comma\-separated
entries in \fBcompiler_ids\fP, otherwise \fB0\fP\&. This expression is a short form
for the combination of \fB$<LINK_LANGUAGE:language>\fP and
\fB$<LANG_COMPILER_ID:compiler_ids>\fP\&. This expression may be used to specify
link libraries, link options, link directories and link dependencies of a
particular language and linker combination in a target. For example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(libC_Clang ...)
add_library(libCXX_Clang ...)
add_library(libC_Intel ...)
add_library(libCXX_Intel ...)

add_executable(myapp main.c)
if (CXX_CONFIG)
  target_sources(myapp PRIVATE file.cxx)
endif()
target_link_libraries(myapp
  PRIVATE $<$<LINK_LANG_AND_ID:CXX,Clang,AppleClang>:libCXX_Clang>
          $<$<LINK_LANG_AND_ID:C,Clang,AppleClang>:libC_Clang>
          $<$<LINK_LANG_AND_ID:CXX,Intel>:libCXX_Intel>
          $<$<LINK_LANG_AND_ID:C,Intel>:libC_Intel>)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This specifies the use of different link libraries based on both the
compiler id and link language. This example will have target \fBlibCXX_Clang\fP
as link dependency when \fBClang\fP or \fBAppleClang\fP is the \fBCXX\fP
linker, and \fBlibCXX_Intel\fP when \fBIntel\fP is the \fBCXX\fP linker.
Likewise when the \fBC\fP linker is \fBClang\fP or \fBAppleClang\fP, target
\fBlibC_Clang\fP will be added as link dependency and \fBlibC_Intel\fP when
\fBIntel\fP is the \fBC\fP linker.
.sp
See \fI\%the note related to\fP
\fB$<LINK_LANGUAGE:language>\fP for constraints about the usage of this
generator expression.
.UNINDENT
.SS Link Features
.INDENT 0.0
.TP
.B $<LINK_LIBRARY:feature,library\-list>
New in version 3.24.

.sp
Specify a set of libraries to link to a target, along with a \fBfeature\fP
which provides details about \fIhow\fP they should be linked.  For example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib1 STATIC ...)
add_library(lib2 ...)
target_link_libraries(lib2 PRIVATE \(dq$<LINK_LIBRARY:WHOLE_ARCHIVE,lib1>\(dq)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This specifies that \fBlib2\fP should link to \fBlib1\fP and use the
\fBWHOLE_ARCHIVE\fP feature when doing so.
.sp
Feature names are case\-sensitive and may only contain letters, numbers and
underscores.  Feature names defined in all uppercase are reserved for CMake\(aqs
own built\-in features.  The pre\-defined built\-in library features are:
.INDENT 7.0
.TP
.B \fBDEFAULT\fP
This feature corresponds to standard linking, essentially equivalent to
using no feature at all.  It is typically only used with the
\fI\%LINK_LIBRARY_OVERRIDE\fP and
\fI\%LINK_LIBRARY_OVERRIDE_<LIBRARY>\fP target properties.
.TP
.B \fBWHOLE_ARCHIVE\fP
Force inclusion of all members of a static library.  This feature is only
supported for the following platforms, with limitations as noted:
.INDENT 7.0
.IP \(bu 2
Linux.
.IP \(bu 2
All BSD variants.
.IP \(bu 2
SunOS.
.IP \(bu 2
All Apple variants.  The library must be specified as a CMake target name,
a library file name (such as \fBlibfoo.a\fP), or a library file path (such as
\fB/path/to/libfoo.a\fP).  Due to a limitation of the Apple linker, it
cannot be specified as a plain library name like \fBfoo\fP, where \fBfoo\fP
is not a CMake target.
.IP \(bu 2
Windows.  When using a MSVC or MSVC\-like toolchain, the MSVC version must
be greater than 1900.
.IP \(bu 2
Cygwin.
.IP \(bu 2
MSYS.
.UNINDENT
.TP
.B \fBFRAMEWORK\fP
This option tells the linker to search for the specified framework using
the \fB\-framework\fP linker option.  It can only be used on Apple platforms,
and only with a linker that understands the option used (i.e. the linker
provided with Xcode, or one compatible with it).
.sp
The framework can be specified as a CMake framework target, a bare framework
name, or a file path.  If a target is given, that target must have the
\fI\%FRAMEWORK\fP target property set to true.  For a file path, if it
contains a directory part, that directory will be added as a framework
search path.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib SHARED ...)
target_link_libraries(lib PRIVATE \(dq$<LINK_LIBRARY:FRAMEWORK,/path/to/my_framework>\(dq)

# The constructed linker command line will contain:
#   \-F/path/to \-framework my_framework
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
File paths must conform to one of the following patterns (\fB*\fP is a
wildcard, and optional parts are shown as \fB[...]\fP):
.INDENT 7.0
.INDENT 3.5
.INDENT 0.0
.IP \(bu 2
\fB[/path/to/]FwName[.framework]\fP
.IP \(bu 2
\fB[/path/to/]FwName.framework/FwName[suffix]\fP
.IP \(bu 2
\fB[/path/to/]FwName.framework/Versions/*/FwName[suffix]\fP
.UNINDENT
.UNINDENT
.UNINDENT
.sp
Note that CMake recognizes and automatically handles framework targets,
even without using the \fI\%$<LINK_LIBRARY:FRAMEWORK,...>\fP expression.
The generator expression can still be used with a CMake target if the
project wants to be explicit about it, but it is not required to do so.
The linker command line may have some differences between using the
generator expression or not, but the final result should be the same.
On the other hand, if a file path is given, CMake will recognize some paths
automatically, but not all cases.  The project may want to use
\fI\%$<LINK_LIBRARY:FRAMEWORK,...>\fP for file paths so that the expected
behavior is clear.
.sp
New in version 3.25: The \fI\%FRAMEWORK_MULTI_CONFIG_POSTFIX_<CONFIG>\fP target property as
well as the \fBsuffix\fP of the framework library name are now supported by
the \fBFRAMEWORK\fP features.

.TP
.B \fBNEEDED_FRAMEWORK\fP
This is similar to the \fBFRAMEWORK\fP feature, except it forces the linker
to link with the framework even if no symbols are used from it.  It uses
the \fB\-needed_framework\fP option and has the same linker constraints as
\fBFRAMEWORK\fP\&.
.TP
.B \fBREEXPORT_FRAMEWORK\fP
This is similar to the \fBFRAMEWORK\fP feature, except it tells the linker
that the framework should be available to clients linking to the library
being created.  It uses the \fB\-reexport_framework\fP option and has the
same linker constraints as \fBFRAMEWORK\fP\&.
.TP
.B \fBWEAK_FRAMEWORK\fP
This is similar to the \fBFRAMEWORK\fP feature, except it forces the linker
to mark the framework and all references to it as weak imports.  It uses
the \fB\-weak_framework\fP option and has the same linker constraints as
\fBFRAMEWORK\fP\&.
.TP
.B \fBNEEDED_LIBRARY\fP
This is similar to the \fBNEEDED_FRAMEWORK\fP feature, except it is for use
with non\-framework targets or libraries (Apple platforms only).
It uses the \fB\-needed_library\fP or \fB\-needed\-l\fP option as appropriate,
and has the same linker constraints as \fBNEEDED_FRAMEWORK\fP\&.
.TP
.B \fBREEXPORT_LIBRARY\fP
This is similar to the \fBREEXPORT_FRAMEWORK\fP feature,  except it is for use
with non\-framework targets or libraries (Apple platforms only).
It uses the \fB\-reexport_library\fP or \fB\-reexport\-l\fP option as appropriate,
and has the same linker constraints as \fBREEXPORT_FRAMEWORK\fP\&.
.TP
.B \fBWEAK_LIBRARY\fP
This is similar to the \fBWEAK_FRAMEWORK\fP feature, except it is for use
with non\-framework targets or libraries (Apple platforms only).
It uses the \fB\-weak_library\fP or \fB\-weak\-l\fP option as appropriate,
and has the same linker constraints as \fBWEAK_FRAMEWORK\fP\&.
.UNINDENT
.sp
Built\-in and custom library features are defined in terms of the following
variables:
.INDENT 7.0
.IP \(bu 2
\fI\%CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>_SUPPORTED\fP
.IP \(bu 2
\fI\%CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>\fP
.IP \(bu 2
\fI\%CMAKE_LINK_LIBRARY_USING_<FEATURE>_SUPPORTED\fP
.IP \(bu 2
\fI\%CMAKE_LINK_LIBRARY_USING_<FEATURE>\fP
.UNINDENT
.sp
The value used for each of these variables is the value as set at the end of
the directory scope in which the target was created.  The usage is as follows:
.INDENT 7.0
.IP 1. 3
If the language\-specific
\fI\%CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>_SUPPORTED\fP variable
is true, the \fBfeature\fP must be defined by the corresponding
\fI\%CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>\fP variable.
.IP 2. 3
If no language\-specific \fBfeature\fP is supported, then the
\fI\%CMAKE_LINK_LIBRARY_USING_<FEATURE>_SUPPORTED\fP variable must be
true and the \fBfeature\fP must be defined by the corresponding
\fI\%CMAKE_LINK_LIBRARY_USING_<FEATURE>\fP variable.
.UNINDENT
.sp
The following limitations should be noted:
.INDENT 7.0
.IP \(bu 2
The \fBlibrary\-list\fP can specify CMake targets or libraries.
Any CMake target of type \fI\%OBJECT\fP
or \fI\%INTERFACE\fP will ignore the feature aspect
of the expression and instead be linked in the standard way.
.IP \(bu 2
The \fB$<LINK_LIBRARY:...>\fP generator expression can only be used to
specify link libraries.  In practice, this means it can appear in the
\fI\%LINK_LIBRARIES\fP, \fI\%INTERFACE_LINK_LIBRARIES\fP, and
\fI\%INTERFACE_LINK_LIBRARIES_DIRECT\fP  target properties, and be
specified in \fI\%target_link_libraries()\fP and \fI\%link_libraries()\fP
commands.
.IP \(bu 2
If a \fB$<LINK_LIBRARY:...>\fP generator expression appears in the
\fI\%INTERFACE_LINK_LIBRARIES\fP property of a target, it will be
included in the imported target generated by a \fI\%install(EXPORT)\fP
command.  It is the responsibility of the environment consuming this
import to define the link feature used by this expression.
.IP \(bu 2
Each target or library involved in the link step must have at most only
one kind of library feature.  The absence of a feature is also incompatible
with all other features.  For example:
.INDENT 2.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib1 ...)
add_library(lib2 ...)
add_library(lib3 ...)

# lib1 will be associated with feature1
target_link_libraries(lib2 PUBLIC \(dq$<LINK_LIBRARY:feature1,lib1>\(dq)

# lib1 is being linked with no feature here. This conflicts with the
# use of feature1 in the line above and would result in an error.
target_link_libraries(lib3 PRIVATE lib1 lib2)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Where it isn\(aqt possible to use the same feature throughout a build for a
given target or library, the \fI\%LINK_LIBRARY_OVERRIDE\fP and
\fI\%LINK_LIBRARY_OVERRIDE_<LIBRARY>\fP target properties can be
used to resolve such incompatibilities.
.IP \(bu 2
The \fB$<LINK_LIBRARY:...>\fP generator expression does not guarantee
that the list of specified targets and libraries will be kept grouped
together.  To manage constructs like \fB\-\-start\-group\fP and \fB\-\-end\-group\fP,
as supported by the GNU \fBld\fP linker, use the \fI\%LINK_GROUP\fP
generator expression instead.
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B $<LINK_GROUP:feature,library\-list>
New in version 3.24.

.sp
Specify a group of libraries to link to a target, along with a \fBfeature\fP
which defines how that group should be linked.  For example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib1 STATIC ...)
add_library(lib2 ...)
target_link_libraries(lib2 PRIVATE \(dq$<LINK_GROUP:RESCAN,lib1,external>\(dq)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This specifies that \fBlib2\fP should link to \fBlib1\fP and \fBexternal\fP, and
that both of those two libraries should be included on the linker command
line according to the definition of the \fBRESCAN\fP feature.
.sp
Feature names are case\-sensitive and may only contain letters, numbers and
underscores.  Feature names defined in all uppercase are reserved for CMake\(aqs
own built\-in features.  Currently, there is only one pre\-defined built\-in
group feature:
.INDENT 7.0
.TP
.B \fBRESCAN\fP
Some linkers are single\-pass only.  For such linkers, circular references
between libraries typically result in unresolved symbols.  This feature
instructs the linker to search the specified static libraries repeatedly
until no new undefined references are created.
.sp
Normally, a static library is searched only once in the order that it is
specified on the command line.  If a symbol in that library is needed to
resolve an undefined symbol referred to by an object in a library that
appears later on the command line, the linker would not be able to resolve
that reference.  By grouping the static libraries with the \fBRESCAN\fP
feature, they will all be searched repeatedly until all possible references
are resolved.  This will use linker options like \fB\-\-start\-group\fP and
\fB\-\-end\-group\fP, or on SunOS, \fB\-z rescan\-start\fP and \fB\-z rescan\-end\fP\&.
.sp
Using this feature has a significant performance cost. It is best to use it
only when there are unavoidable circular references between two or more
static libraries.
.sp
This feature is available when using toolchains that target Linux, BSD, and
SunOS.  It can also be used when targeting Windows platforms if the GNU
toolchain is used.
.UNINDENT
.sp
Built\-in and custom group features are defined in terms of the following
variables:
.INDENT 7.0
.IP \(bu 2
\fI\%CMAKE_<LANG>_LINK_GROUP_USING_<FEATURE>_SUPPORTED\fP
.IP \(bu 2
\fI\%CMAKE_<LANG>_LINK_GROUP_USING_<FEATURE>\fP
.IP \(bu 2
\fI\%CMAKE_LINK_GROUP_USING_<FEATURE>_SUPPORTED\fP
.IP \(bu 2
\fI\%CMAKE_LINK_GROUP_USING_<FEATURE>\fP
.UNINDENT
.sp
The value used for each of these variables is the value as set at the end of
the directory scope in which the target was created.  The usage is as follows:
.INDENT 7.0
.IP 1. 3
If the language\-specific
\fI\%CMAKE_<LANG>_LINK_GROUP_USING_<FEATURE>_SUPPORTED\fP variable
is true, the \fBfeature\fP must be defined by the corresponding
\fI\%CMAKE_<LANG>_LINK_GROUP_USING_<FEATURE>\fP variable.
.IP 2. 3
If no language\-specific \fBfeature\fP is supported, then the
\fI\%CMAKE_LINK_GROUP_USING_<FEATURE>_SUPPORTED\fP variable must be
true and the \fBfeature\fP must be defined by the corresponding
\fI\%CMAKE_LINK_GROUP_USING_<FEATURE>\fP variable.
.UNINDENT
.sp
The \fBLINK_GROUP\fP generator expression is compatible with the
\fI\%LINK_LIBRARY\fP generator expression. The libraries involved in a
group can be specified using the \fI\%LINK_LIBRARY\fP generator expression.
.sp
Each target or external library involved in the link step is allowed to be
part of multiple groups, but only if all the groups involved specify the
same \fBfeature\fP\&.  Such groups will not be merged on the linker command line,
the individual groups will still be preserved.  Mixing different group
features for the same target or library is forbidden.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib1 ...)
add_library(lib2 ...)
add_library(lib3 ...)
add_library(lib4 ...)
add_library(lib5 ...)

target_link_libraries(lib3 PUBLIC  \(dq$<LINK_GROUP:feature1,lib1,lib2>\(dq)
target_link_libraries(lib4 PRIVATE \(dq$<LINK_GROUP:feature1,lib1,lib3>\(dq)
# lib4 will be linked with the groups {lib1,lib2} and {lib1,lib3}.
# Both groups specify the same feature, so this is fine.

target_link_libraries(lib5 PRIVATE \(dq$<LINK_GROUP:feature2,lib1,lib3>\(dq)
# An error will be raised here because both lib1 and lib3 are part of two
# groups with different features.
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
When a target or an external library is involved in the link step as part of
a group and also as not part of any group, any occurrence of the non\-group
link item will be replaced by the groups it belongs to.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib1 ...)
add_library(lib2 ...)
add_library(lib3 ...)
add_library(lib4 ...)

target_link_libraries(lib3 PUBLIC lib1)

target_link_libraries(lib4 PRIVATE lib3 \(dq$<LINK_GROUP:feature1,lib1,lib2>\(dq)
# lib4 will only be linked with lib3 and the group {lib1,lib2}
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Because \fBlib1\fP is part of the group defined for \fBlib4\fP, that group then
gets applied back to the use of \fBlib1\fP for \fBlib3\fP\&.  The end result will
be as though the linking relationship for \fBlib3\fP had been specified as:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
target_link_libraries(lib3 PUBLIC \(dq$<LINK_GROUP:feature1,lib1,lib2>\(dq)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Be aware that the precedence of the group over the non\-group link item can
result in circular dependencies between groups.  If this occurs, a fatal
error is raised because circular dependencies are not allowed for groups.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(lib1A ...)
add_library(lib1B ...)
add_library(lib2A ...)
add_library(lib2B ...)
add_library(lib3 ...)

# Non\-group linking relationships, these are non\-circular so far
target_link_libraries(lib1A PUBLIC lib2A)
target_link_libraries(lib2B PUBLIC lib1B)

# The addition of these groups creates circular dependencies
target_link_libraries(lib3 PRIVATE
  \(dq$<LINK_GROUP:feat,lib1A,lib1B>\(dq
  \(dq$<LINK_GROUP:feat,lib2A,lib2B>\(dq
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Because of the groups defined for \fBlib3\fP, the linking relationships for
\fBlib1A\fP and \fBlib2B\fP effectively get expanded to the equivalent of:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
target_link_libraries(lib1A PUBLIC \(dq$<LINK_GROUP:feat,lib2A,lib2B>\(dq)
target_link_libraries(lib2B PUBLIC \(dq$<LINK_GROUP:feat,lib1A,lib1B>\(dq)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This creates a circular dependency between groups:
\fBlib1A \-\-> lib2B \-\-> lib1A\fP\&.
.sp
The following limitations should also be noted:
.INDENT 7.0
.IP \(bu 2
The \fBlibrary\-list\fP can specify CMake targets or libraries.
Any CMake target of type \fI\%OBJECT\fP
or \fI\%INTERFACE\fP will ignore the feature aspect
of the expression and instead be linked in the standard way.
.IP \(bu 2
The \fB$<LINK_GROUP:...>\fP generator expression can only be used to
specify link libraries.  In practice, this means it can appear in the
\fI\%LINK_LIBRARIES\fP, \fI\%INTERFACE_LINK_LIBRARIES\fP,and
\fI\%INTERFACE_LINK_LIBRARIES_DIRECT\fP target properties, and be
specified in \fI\%target_link_libraries()\fP and \fI\%link_libraries()\fP
commands.
.IP \(bu 2
If a \fB$<LINK_GROUP:...>\fP generator expression appears in the
\fI\%INTERFACE_LINK_LIBRARIES\fP property of a target, it will be
included in the imported target generated by a \fI\%install(EXPORT)\fP
command.  It is the responsibility of the environment consuming this
import to define the link feature used by this expression.
.UNINDENT
.UNINDENT
.SS Link Context
.INDENT 0.0
.TP
.B $<LINK_ONLY:...>
New in version 3.1.

.sp
Content of \fB\&...\fP, except while collecting \fI\%Transitive Usage Requirements\fP,
in which case it is the empty string.  This is intended for use in an
\fI\%INTERFACE_LINK_LIBRARIES\fP target property, typically populated
via the \fI\%target_link_libraries()\fP command, to specify private link
dependencies without other usage requirements.
.sp
New in version 3.24: \fBLINK_ONLY\fP may also be used in a \fI\%LINK_LIBRARIES\fP target
property.  See policy \fI\%CMP0131\fP\&.

.UNINDENT
.INDENT 0.0
.TP
.B $<DEVICE_LINK:list>
New in version 3.18.

.sp
Returns the list if it is the device link step, an empty list otherwise.
The device link step is controlled by \fI\%CUDA_SEPARABLE_COMPILATION\fP
and \fI\%CUDA_RESOLVE_DEVICE_SYMBOLS\fP properties and
policy \fI\%CMP0105\fP\&. This expression can only be used to specify link
options.
.UNINDENT
.INDENT 0.0
.TP
.B $<HOST_LINK:list>
New in version 3.18.

.sp
Returns the list if it is the normal link step, an empty list otherwise.
This expression is mainly useful when a device link step is also involved
(see \fI\%$<DEVICE_LINK:list>\fP generator expression). This expression can
only be used to specify link options.
.UNINDENT
.SS Target\-Dependent Expressions
.sp
These queries refer to a target \fBtgt\fP\&. Unless otherwise stated, this can
be any runtime artifact, namely:
.INDENT 0.0
.IP \(bu 2
An executable target created by \fI\%add_executable()\fP\&.
.IP \(bu 2
A shared library target (\fB\&.so\fP, \fB\&.dll\fP but not their \fB\&.lib\fP import
library) created by \fI\%add_library()\fP\&.
.IP \(bu 2
A static library target created by \fI\%add_library()\fP\&.
.UNINDENT
.sp
In the following, the phrase \(dqthe \fBtgt\fP filename\(dq means the name of the
\fBtgt\fP binary file. This has to be distinguished from the phrase
\(dqthe target name\(dq, which is just the string \fBtgt\fP\&.
.INDENT 0.0
.TP
.B $<TARGET_EXISTS:tgt>
New in version 3.12.

.sp
\fB1\fP if \fBtgt\fP exists as a CMake target, else \fB0\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_NAME_IF_EXISTS:tgt>
New in version 3.12.

.sp
The target name \fBtgt\fP if the target exists, an empty string otherwise.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_NAME:...>
Marks \fB\&...\fP as being the name of a target.  This is required if exporting
targets to multiple dependent export sets.  The \fB\&...\fP must be a literal
name of a target, it may not contain generator expressions.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_PROPERTY:tgt,prop>
Value of the property \fBprop\fP on the target \fBtgt\fP\&.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.sp
Changed in version 3.26: When encountered during evaluation of \fI\%Transitive Usage Requirements\fP,
typically in an \fBINTERFACE_*\fP target property, lookup of the \fBtgt\fP
name occurs in the directory of the target specifying the requirement,
rather than the directory of the consuming target for which the
expression is being evaluated.

.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_PROPERTY:prop>
Value of the property \fBprop\fP on the target for which the expression
is being evaluated. Note that for generator expressions in
\fI\%Transitive Usage Requirements\fP this is the consuming target rather
than the target specifying the requirement.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_OBJECTS:tgt>
New in version 3.1.

.sp
List of objects resulting from building \fBtgt\fP\&.  This would typically be
used on \fI\%object library\fP targets.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_POLICY:policy>
\fB1\fP if the \fBpolicy\fP was \fBNEW\fP when the \(aqhead\(aq target was created,
else \fB0\fP\&.  If the \fBpolicy\fP was not set, the warning message for the policy
will be emitted. This generator expression only works for a subset of
policies.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_FILE:tgt>
Full path to the \fBtgt\fP binary file.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on, unless the expression is being used in
\fI\%add_custom_command()\fP or \fI\%add_custom_target()\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_FILE_BASE_NAME:tgt>
New in version 3.15.

.sp
Base name of \fBtgt\fP, i.e. \fB$<TARGET_FILE_NAME:tgt>\fP without prefix and
suffix.
For example, if the \fBtgt\fP filename is \fBlibbase.so\fP, the base name is \fBbase\fP\&.
.sp
See also the \fI\%OUTPUT_NAME\fP, \fI\%ARCHIVE_OUTPUT_NAME\fP,
\fI\%LIBRARY_OUTPUT_NAME\fP and \fI\%RUNTIME_OUTPUT_NAME\fP
target properties and their configuration specific variants
\fI\%OUTPUT_NAME_<CONFIG>\fP, \fI\%ARCHIVE_OUTPUT_NAME_<CONFIG>\fP,
\fI\%LIBRARY_OUTPUT_NAME_<CONFIG>\fP and
\fI\%RUNTIME_OUTPUT_NAME_<CONFIG>\fP\&.
.sp
The \fI\%<CONFIG>_POSTFIX\fP and \fI\%DEBUG_POSTFIX\fP target
properties can also be considered.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_FILE_PREFIX:tgt>
New in version 3.15.

.sp
Prefix of the \fBtgt\fP filename (such as \fBlib\fP).
.sp
See also the \fI\%PREFIX\fP target property.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_FILE_SUFFIX:tgt>
New in version 3.15.

.sp
Suffix of the \fBtgt\fP filename (extension such as \fB\&.so\fP or \fB\&.exe\fP).
.sp
See also the \fI\%SUFFIX\fP target property.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_FILE_NAME:tgt>
The \fBtgt\fP filename.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_FILE_DIR:tgt>
Directory of the \fBtgt\fP binary file.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_LINKER_FILE:tgt>
File used when linking to the \fBtgt\fP target.  This will usually
be the library that \fBtgt\fP represents (\fB\&.a\fP, \fB\&.lib\fP, \fB\&.so\fP),
but for a shared library on DLL platforms, it would be the \fB\&.lib\fP
import library associated with the DLL.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_LINKER_FILE_BASE_NAME:tgt>
New in version 3.15.

.sp
Base name of file used to link the target \fBtgt\fP, i.e.
\fB$<TARGET_LINKER_FILE_NAME:tgt>\fP without prefix and suffix. For example,
if target file name is \fBlibbase.a\fP, the base name is \fBbase\fP\&.
.sp
See also the \fI\%OUTPUT_NAME\fP, \fI\%ARCHIVE_OUTPUT_NAME\fP,
and \fI\%LIBRARY_OUTPUT_NAME\fP target properties and their configuration
specific variants \fI\%OUTPUT_NAME_<CONFIG>\fP,
\fI\%ARCHIVE_OUTPUT_NAME_<CONFIG>\fP and
\fI\%LIBRARY_OUTPUT_NAME_<CONFIG>\fP\&.
.sp
The \fI\%<CONFIG>_POSTFIX\fP and \fI\%DEBUG_POSTFIX\fP target
properties can also be considered.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_LINKER_FILE_PREFIX:tgt>
New in version 3.15.

.sp
Prefix of file used to link target \fBtgt\fP\&.
.sp
See also the \fI\%PREFIX\fP and \fI\%IMPORT_PREFIX\fP target
properties.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_LINKER_FILE_SUFFIX:tgt>
New in version 3.15.

.sp
Suffix of file used to link where \fBtgt\fP is the name of a target.
.sp
The suffix corresponds to the file extension (such as \(dq.so\(dq or \(dq.lib\(dq).
.sp
See also the \fI\%SUFFIX\fP and \fI\%IMPORT_SUFFIX\fP target
properties.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_LINKER_FILE_NAME:tgt>
Name of file used to link target \fBtgt\fP\&.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_LINKER_FILE_DIR:tgt>
Directory of file used to link target \fBtgt\fP\&.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_SONAME_FILE:tgt>
File with soname (\fB\&.so.3\fP) where \fBtgt\fP is the name of a target.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_SONAME_FILE_NAME:tgt>
Name of file with soname (\fB\&.so.3\fP).
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_SONAME_FILE_DIR:tgt>
Directory of with soname (\fB\&.so.3\fP).
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_PDB_FILE:tgt>
New in version 3.1.

.sp
Full path to the linker generated program database file (.pdb)
where \fBtgt\fP is the name of a target.
.sp
See also the \fI\%PDB_NAME\fP and \fI\%PDB_OUTPUT_DIRECTORY\fP
target properties and their configuration specific variants
\fI\%PDB_NAME_<CONFIG>\fP and \fI\%PDB_OUTPUT_DIRECTORY_<CONFIG>\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_PDB_FILE_BASE_NAME:tgt>
New in version 3.15.

.sp
Base name of the linker generated program database file (.pdb)
where \fBtgt\fP is the name of a target.
.sp
The base name corresponds to the target PDB file name (see
\fB$<TARGET_PDB_FILE_NAME:tgt>\fP) without prefix and suffix. For example,
if target file name is \fBbase.pdb\fP, the base name is \fBbase\fP\&.
.sp
See also the \fI\%PDB_NAME\fP target property and its configuration
specific variant \fI\%PDB_NAME_<CONFIG>\fP\&.
.sp
The \fI\%<CONFIG>_POSTFIX\fP and \fI\%DEBUG_POSTFIX\fP target
properties can also be considered.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_PDB_FILE_NAME:tgt>
New in version 3.1.

.sp
Name of the linker generated program database file (.pdb).
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_PDB_FILE_DIR:tgt>
New in version 3.1.

.sp
Directory of the linker generated program database file (.pdb).
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_BUNDLE_DIR:tgt>
New in version 3.9.

.sp
Full path to the bundle directory (\fB/path/to/my.app\fP,
\fB/path/to/my.framework\fP, or \fB/path/to/my.bundle\fP),
where \fBtgt\fP is the name of a target.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_BUNDLE_DIR_NAME:tgt>
New in version 3.24.

.sp
Name of the bundle directory (\fBmy.app\fP, \fBmy.framework\fP, or
\fBmy.bundle\fP), where \fBtgt\fP is the name of a target.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_BUNDLE_CONTENT_DIR:tgt>
New in version 3.9.

.sp
Full path to the bundle content directory where \fBtgt\fP is the name of a
target.  For the macOS SDK it leads to \fB/path/to/my.app/Contents\fP,
\fB/path/to/my.framework\fP, or \fB/path/to/my.bundle/Contents\fP\&.
For all other SDKs (e.g. iOS) it leads to \fB/path/to/my.app\fP,
\fB/path/to/my.framework\fP, or \fB/path/to/my.bundle\fP due to the flat
bundle structure.
.sp
Note that \fBtgt\fP is not added as a dependency of the target this
expression is evaluated on (see policy \fI\%CMP0112\fP).
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_RUNTIME_DLLS:tgt>
New in version 3.21.

.sp
List of DLLs that the target depends on at runtime. This is determined by
the locations of all the \fBSHARED\fP targets in the target\(aqs transitive
dependencies. Using this generator expression on targets other than
executables, \fBSHARED\fP libraries, and \fBMODULE\fP libraries is an error.
\fBOn non\-DLL platforms, this expression always evaluates to an empty string\fP\&.
.sp
This generator expression can be used to copy all of the DLLs that a target
depends on into its output directory in a \fBPOST_BUILD\fP custom command using
the \fI\%cmake \-E copy \-t\fP command. For example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
find_package(foo CONFIG REQUIRED) # package generated by install(EXPORT)

add_executable(exe main.c)
target_link_libraries(exe PRIVATE foo::foo foo::bar)
add_custom_command(TARGET exe POST_BUILD
  COMMAND ${CMAKE_COMMAND} \-E copy \-t $<TARGET_FILE_DIR:exe> $<TARGET_RUNTIME_DLLS:exe>
  COMMAND_EXPAND_LISTS
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
\fI\%Imported Targets\fP are supported only if they know the location
of their \fB\&.dll\fP files.  An imported \fBSHARED\fP library must have
\fI\%IMPORTED_LOCATION\fP set to its \fB\&.dll\fP file.  See the
\fI\%add_library imported libraries\fP
section for details.  Many \fI\%Find Modules\fP produce imported targets
with the \fBUNKNOWN\fP type and therefore will be ignored.
.UNINDENT
.UNINDENT
.UNINDENT
.sp
On platforms that support runtime paths (\fBRPATH\fP), refer to the
\fI\%INSTALL_RPATH\fP target property.
On Apple platforms, refer to the \fI\%INSTALL_NAME_DIR\fP target property.
.SS Export And Install Expressions
.INDENT 0.0
.TP
.B $<INSTALL_INTERFACE:...>
Content of \fB\&...\fP when the property is exported using
\fI\%install(EXPORT)\fP, and empty otherwise.
.UNINDENT
.INDENT 0.0
.TP
.B $<BUILD_INTERFACE:...>
Content of \fB\&...\fP when the property is exported using \fI\%export()\fP, or
when the target is used by another target in the same buildsystem. Expands to
the empty string otherwise.
.UNINDENT
.INDENT 0.0
.TP
.B $<BUILD_LOCAL_INTERFACE:...>
New in version 3.26.

.sp
Content of \fB\&...\fP when the target is used by another target in the same
buildsystem. Expands to the empty string otherwise.
.UNINDENT
.INDENT 0.0
.TP
.B $<INSTALL_PREFIX>
Content of the install prefix when the target is exported via
\fI\%install(EXPORT)\fP, or when evaluated in the
\fI\%INSTALL_NAME_DIR\fP property or the \fBINSTALL_NAME_DIR\fP argument of
\fI\%install(RUNTIME_DEPENDENCY_SET)\fP, and empty otherwise.
.UNINDENT
.SS Multi\-level Expression Evaluation
.INDENT 0.0
.TP
.B $<GENEX_EVAL:expr>
New in version 3.12.

.sp
Content of \fBexpr\fP evaluated as a generator expression in the current
context. This enables consumption of generator expressions whose
evaluation results itself in generator expressions.
.UNINDENT
.INDENT 0.0
.TP
.B $<TARGET_GENEX_EVAL:tgt,expr>
New in version 3.12.

.sp
Content of \fBexpr\fP evaluated as a generator expression in the context of
\fBtgt\fP target. This enables consumption of custom target properties that
themselves contain generator expressions.
.sp
Having the capability to evaluate generator expressions is very useful when
you want to manage custom properties supporting generator expressions.
For example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_library(foo ...)

set_property(TARGET foo PROPERTY
  CUSTOM_KEYS $<$<CONFIG:DEBUG>:FOO_EXTRA_THINGS>
)

add_custom_target(printFooKeys
  COMMAND ${CMAKE_COMMAND} \-E echo $<TARGET_PROPERTY:foo,CUSTOM_KEYS>
)
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This naive implementation of the \fBprintFooKeys\fP custom command is wrong
because \fBCUSTOM_KEYS\fP target property is not evaluated and the content
is passed as is (i.e. \fB$<$<CONFIG:DEBUG>:FOO_EXTRA_THINGS>\fP).
.sp
To have the expected result (i.e. \fBFOO_EXTRA_THINGS\fP if config is
\fBDebug\fP), it is required to evaluate the output of
\fB$<TARGET_PROPERTY:foo,CUSTOM_KEYS>\fP:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
add_custom_target(printFooKeys
  COMMAND ${CMAKE_COMMAND} \-E
    echo $<TARGET_GENEX_EVAL:foo,$<TARGET_PROPERTY:foo,CUSTOM_KEYS>>
)
.ft P
.fi
.UNINDENT
.UNINDENT
.UNINDENT
.SS Escaped Characters
.sp
These expressions evaluate to specific string literals. Use them in place of
the actual string literal where you need to prevent them from having their
special meaning.
.INDENT 0.0
.TP
.B $<ANGLE\-R>
A literal \fB>\fP\&. Used for example to compare strings that contain a \fB>\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<COMMA>
A literal \fB,\fP\&. Used for example to compare strings which contain a \fB,\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B $<SEMICOLON>
A literal \fB;\fP\&. Used to prevent list expansion on an argument with \fB;\fP\&.
.UNINDENT
.SS Deprecated Expressions
.INDENT 0.0
.TP
.B $<CONFIGURATION>
Configuration name. Deprecated since CMake 3.0. Use \fI\%CONFIG\fP instead.
.UNINDENT
.SH COPYRIGHT
2000-2023 Kitware, Inc. and Contributors
.\" Generated by docutils manpage writer.
.