TI: Add support for C language standards

Set C90 and C99 compile options for TI compiler.

Fixes: #18061

Help/manual/cmake-compile-features.7.rst

@@ -361,6 +361,7 @@ following :variable:`compiler ids <CMAKE_<LANG>_COMPILER_ID>` as of the
 versions specified for each:
 
 * all compilers and versions listed above with only meta-features for C++.
+* ``TI``: Texas Instruments compiler.
 
 CMake is currently aware of the :prop_tgt:`CUDA standards <CUDA_STANDARD>`
 from the following :variable:`compiler ids <CMAKE_<LANG>_COMPILER_ID>` as of the

Help/release/dev/ti-c-standard.rst

@@ -0,0 +1,6 @@
+ti-c-standard
+-------------
+
+* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
+  is now aware of C language standards supported by Texas Instruments C
+  compilers.

Modules/Compiler/TI-C.cmake

@@ -2,6 +2,12 @@ set(CMAKE_LIBRARY_PATH_FLAG "--search_path=")
 set(CMAKE_LINK_LIBRARY_FLAG "--library=")
 set(CMAKE_INCLUDE_FLAG_C "--include_path=")
 
+set(CMAKE_C90_STANDARD_COMPILE_OPTION "--c89")
+set(CMAKE_C90_EXTENSION_COMPILE_OPTION "--c89 --relaxed_ansi")
+
+set(CMAKE_C99_STANDARD_COMPILE_OPTION "--c99")
+set(CMAKE_C99_EXTENSION_COMPILE_OPTION "--c99 --relaxed_ansi")
+
 set(CMAKE_DEPFILE_FLAGS_C "--preproc_with_compile --preproc_dependency=<DEPFILE>")
 
 set(CMAKE_C_CREATE_ASSEMBLY_SOURCE "<CMAKE_C_COMPILER> --compile_only --skip_assembler --c_file=<SOURCE> <DEFINES> <INCLUDES> <FLAGS> --output_file=<ASSEMBLY_SOURCE>")