LINK_LIBRARIES
--------------

List of direct link dependencies.

This property specifies the list of libraries or targets which will be
used for linking.  In addition to accepting values from the
target_link_libraries command, values may be set directly on any
target using the set_property command.

The target property values are used by the generators to set the link
libraries for the compiler.  See also the target_link_libraries
command.

Contents of LINK_LIBRARIES may use "generator expressions" with the
syntax "$<...>".  Generator expressions are evaluated during build
system generation to produce information specific to each build
configuration.  Valid expressions are:

::

  $<0:...>                  = empty string (ignores "...")
  $<1:...>                  = content of "..."
  $<CONFIG:cfg>             = '1' if config is "cfg", else '0'
  $<CONFIGURATION>          = configuration name
  $<BOOL:...>               = '1' if the '...' is true, else '0'
  $<STREQUAL:a,b>           = '1' if a is STREQUAL b, else '0'
  $<ANGLE-R>                = A literal '>'. Used to compare strings which contain a '>' for example.
  $<COMMA>                  = A literal ','. Used to compare strings which contain a ',' for example.
  $<SEMICOLON>              = A literal ';'. Used to prevent list expansion on an argument with ';'.
  $<JOIN:list,...>          = joins the list with the content of "..."
  $<TARGET_NAME:...>        = Marks ... as being the name of a target.  This is required if exporting targets to multiple dependent export sets.  The '...' must be a literal name of a target- it may not contain generator expressions.
  $<INSTALL_INTERFACE:...>  = content of "..." when the property is exported using install(EXPORT), and empty otherwise.
  $<BUILD_INTERFACE:...>    = content of "..." when the property is exported using export(), or when the target is used by another target in the same buildsystem. Expands to the empty string otherwise.
  $<PLATFORM_ID>            = The CMake-id of the platform   $<PLATFORM_ID:comp>       = '1' if the The CMake-id of the platform matches comp, otherwise '0'.
  $<C_COMPILER_ID>          = The CMake-id of the C compiler used.
  $<C_COMPILER_ID:comp>     = '1' if the CMake-id of the C compiler matches comp, otherwise '0'.
  $<CXX_COMPILER_ID>        = The CMake-id of the CXX compiler used.
  $<CXX_COMPILER_ID:comp>   = '1' if the CMake-id of the CXX compiler matches comp, otherwise '0'.
  $<VERSION_GREATER:v1,v2>  = '1' if v1 is a version greater than v2, else '0'.
  $<VERSION_LESS:v1,v2>     = '1' if v1 is a version less than v2, else '0'.
  $<VERSION_EQUAL:v1,v2>    = '1' if v1 is the same version as v2, else '0'.
  $<C_COMPILER_VERSION>     = The version of the C compiler used.
  $<C_COMPILER_VERSION:ver> = '1' if the version of the C compiler matches ver, otherwise '0'.
  $<CXX_COMPILER_VERSION>   = The version of the CXX compiler used.
  $<CXX_COMPILER_VERSION:ver> = '1' if the version of the CXX compiler matches ver, otherwise '0'.
  $<TARGET_FILE:tgt>        = main file (.exe, .so.1.2, .a)
  $<TARGET_LINKER_FILE:tgt> = file used to link (.a, .lib, .so)
  $<TARGET_SONAME_FILE:tgt> = file with soname (.so.3)

where "tgt" is the name of a target.  Target file expressions produce
a full path, but _DIR and _NAME versions can produce the directory and
file name components:

::

  $<TARGET_FILE_DIR:tgt>/$<TARGET_FILE_NAME:tgt>
  $<TARGET_LINKER_FILE_DIR:tgt>/$<TARGET_LINKER_FILE_NAME:tgt>
  $<TARGET_SONAME_FILE_DIR:tgt>/$<TARGET_SONAME_FILE_NAME:tgt>



::

  $<TARGET_PROPERTY:tgt,prop>   = The value of the property prop on the target tgt.

Note that tgt is not added as a dependency of the target this
expression is evaluated on.

::

  $<TARGET_POLICY:pol>          = '1' if the policy was NEW when the 'head' target was created, else '0'.  If the policy was not set, the warning message for the policy will be emitted.  This generator expression only works for a subset of policies.
  $<INSTALL_PREFIX>         = Content of the install prefix when the target is exported via INSTALL(EXPORT) and empty otherwise.

Boolean expressions:

::

  $<AND:?[,?]...>           = '1' if all '?' are '1', else '0'
  $<OR:?[,?]...>            = '0' if all '?' are '0', else '1'
  $<NOT:?>                  = '0' if '?' is '1', else '1'

where '?' is always either '0' or '1'.

Expressions with an implicit 'this' target:

::

  $<TARGET_PROPERTY:prop>   = The value of the property prop on the target on which the generator expression is evaluated.
