Check* functions family: add support for LINK_OPTIONS

Fixes: #18521

1 files changed, 23 insertions, 10 deletions

diff --git a/Modules/CheckFunctionExists.cmake b/Modules/CheckFunctionExists.cmake
index cbec739..c39144f 100644
--- a/Modules/CheckFunctionExists.cmake
+++ b/Modules/CheckFunctionExists.cmake
@@ -7,27 +7,33 @@ CheckFunctionExists
 
 Check if a C function can be linked
 
-.. code-block:: cmake
+.. command:: check_function_exists
 
-  check_function_exists(<function> <variable>)
+  .. code-block:: cmake
 
-Checks that the ``<function>`` is provided by libraries on the system and store
-the result in a ``<variable>``, which will be created as an internal
-cache variable.
+    check_function_exists(<function> <variable>)
+
+  Checks that the ``<function>`` is provided by libraries on the system and store
+  the result in a ``<variable>``, which will be created as an internal
+  cache variable.
 
 The following variables may be set before calling this macro to modify the
 way the check is run:
 
 ``CMAKE_REQUIRED_FLAGS``
-  string of compile command line flags
+  string of compile command line flags.
 ``CMAKE_REQUIRED_DEFINITIONS``
-  list of macros to define (-DFOO=bar)
+  a :ref:`;-list <CMake Language Lists>` of macros to define (-DFOO=bar).
 ``CMAKE_REQUIRED_INCLUDES``
-  list of include directories
+  a :ref:`;-list <CMake Language Lists>` of header search paths to pass to
+  the compiler.
+``CMAKE_REQUIRED_LINK_OPTIONS``
+  a :ref:`;-list <CMake Language Lists>` of options to add to the link command.
 ``CMAKE_REQUIRED_LIBRARIES``
-  list of libraries to link
+  a :ref:`;-list <CMake Language Lists>` of libraries to add to the link
+  command. See policy :policy:`CMP0075`.
 ``CMAKE_REQUIRED_QUIET``
-  execute quietly without messages
+  execute quietly without messages.
 
 .. note::
 
@@ -53,6 +59,12 @@ macro(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
     if(NOT CMAKE_REQUIRED_QUIET)
       message(STATUS "Looking for ${FUNCTION}")
     endif()
+    if(CMAKE_REQUIRED_LINK_OPTIONS)
+      set(CHECK_FUNCTION_EXISTS_ADD_LINK_OPTIONS
+        LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
+    else()
+      set(CHECK_FUNCTION_EXISTS_ADD_LINK_OPTIONS)
+    endif()
     if(CMAKE_REQUIRED_LIBRARIES)
       set(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
         LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
@@ -79,6 +91,7 @@ macro(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
       ${CMAKE_BINARY_DIR}
       ${_cfe_source}
       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      ${CHECK_FUNCTION_EXISTS_ADD_LINK_OPTIONS}
       ${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
       "${CHECK_FUNCTION_EXISTS_ADD_INCLUDES}"