try_{compile,run}: add LINKER_LANGUAGE option

Fixes: #25326

Help/command/try_compile.rst

@@ -77,6 +77,7 @@ Try Compiling Source Files
               [COMPILE_DEFINITIONS <defs>...]
               [LINK_OPTIONS <options>...]
               [LINK_LIBRARIES <libs>...]
+              [LINKER_LANGUAGE <lang>]
               [OUTPUT_VARIABLE <var>]
               [COPY_FILE <fileName> [COPY_FILE_ERROR <var>]]
               [<LANG>_STANDARD <std>]
@@ -184,6 +185,14 @@ The options for the above signatures are:
   set the :prop_tgt:`STATIC_LIBRARY_OPTIONS` target property in the generated
   project, depending on the :variable:`CMAKE_TRY_COMPILE_TARGET_TYPE` variable.
 
+``LINKER_LANGUAGE <lang>```
+  .. versionadded:: 3.29
+
+  Specify the :prop_tgt:`LINKER_LANGUAGE` target property of the generated
+  project.  When using multiple source files with different languages, set
+  this to the language of the source file containing the program entry point,
+  e.g., ``main``.
+
 ``LOG_DESCRIPTION <text>``
   .. versionadded:: 3.26
 

Help/command/try_run.rst

@@ -67,6 +67,7 @@ The signature above is recommended for clarity.
           [COMPILE_DEFINITIONS <defs>...]
           [LINK_OPTIONS <options>...]
           [LINK_LIBRARIES <libs>...]
+          [LINKER_LANGUAGE <lang>]
           [COMPILE_OUTPUT_VARIABLE <var>]
           [COPY_FILE <fileName> [COPY_FILE_ERROR <var>]]
           [<LANG>_STANDARD <std>]