build: add check_cxx_compiler_flag for SDL flags

Author: spalicki

cmake/SDL.cmake

@@ -27,16 +27,18 @@ include("cmake/utils.cmake")
 # The flags that can be used for the main and host compilers should be moved to
 # the macros to avoid code duplication and ensure consistency.
 macro(sdl_unix_common_ccxx_flags var)
-    append(${var} "-fPIC -Wformat -Wformat-security")
+    test_compiler_and_add_flag("-fPIC" ${var})
+    test_compiler_and_add_flag("-Wformat" ${var})
+    test_compiler_and_add_flag("-Wformat-security" ${var})
 endmacro()
 
 macro(sdl_gnu_common_ccxx_flags var gnu_version)
     if(${gnu_version} VERSION_LESS 4.9)
-        append(${var} "-fstack-protector-all")
+        test_compiler_and_add_flag("-fstack-protector-all" ${var})
     else()
-        append(${var} "-fstack-protector-strong")
+        test_compiler_and_add_flag("-fstack-protector-strong" ${var})
         if(NOT (${gnu_version} VERSION_LESS 8.0) AND (DNNL_TARGET_ARCH STREQUAL "X64"))
-            append(${var} "-fcf-protection=full")
+            test_compiler_and_add_flag("-fcf-protection=full" ${var})
         endif()
     endif()
 endmacro()
@@ -48,7 +50,7 @@ endmacro()
 # this warning on, let's use it too. Applicable for the library sources
 # and interfaces only (tests currently rely on that fact heavily)
 macro(sdl_gnu_src_ccxx_flags var)
-    append(${var} "-Wmissing-field-initializers")
+    test_compiler_and_add_flag("-Wmissing-field-initializers" ${var})
 endmacro()
 
 macro(sdl_gnu_example_ccxx_flags var)
@@ -62,7 +64,7 @@ set(ONEDNN_SDL_LINKER_FLAGS)
 if(UNIX)
     sdl_unix_common_ccxx_flags(ONEDNN_SDL_COMPILER_FLAGS)
     if(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
-        append(ONEDNN_SDL_COMPILER_FLAGS "-D_FORTIFY_SOURCE=2")
+        test_compiler_and_add_flag("-D_FORTIFY_SOURCE=2" ONEDNN_SDL_COMPILER_FLAGS)
     endif()
     if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
         sdl_gnu_common_ccxx_flags(ONEDNN_SDL_COMPILER_FLAGS CMAKE_CXX_COMPILER_VERSION)
@@ -72,10 +74,10 @@ if(UNIX)
         get_filename_component(CXX_CMD_NAME ${CMAKE_CXX_COMPILER} NAME)
         # Fujitsu CXX compiler does not support "-fstack-protector-all".
         if(NOT CXX_CMD_NAME STREQUAL "FCC")
-            append(ONEDNN_SDL_COMPILER_FLAGS "-fstack-protector-all")
+            test_compiler_and_add_flag("-fstack-protector-all" ONEDNN_SDL_COMPILER_FLAGS)
         endif()
     elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
-        append(ONEDNN_SDL_COMPILER_FLAGS "-fstack-protector")
+        test_compiler_and_add_flag("-fstack-protector" ONEDNN_SDL_COMPILER_FLAGS)
     endif()
     if(APPLE)
         append(ONEDNN_SDL_LINKER_FLAGS "-Wl,-bind_at_load")
@@ -86,20 +88,29 @@ if(UNIX)
     endif()
 elseif(WIN32)
     if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
-        append(ONEDNN_SDL_COMPILER_FLAGS "/GS /Gy /guard:cf /DYNAMICBASE /sdl")
+        test_compiler_and_add_flag("/GS" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/Gy" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/guard:cf" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/DYNAMICBASE" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/sdl" ONEDNN_SDL_COMPILER_FLAGS)
         append(ONEDNN_SDL_LINKER_FLAGS "/NXCOMPAT /LTCG")
     elseif(CMAKE_BASE_NAME STREQUAL "icx")
-        append(ONEDNN_SDL_COMPILER_FLAGS "/GS /Gy /guard:cf /Wformat /Wformat-security")
+        test_compiler_and_add_flag("/GS" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/Gy" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/guard:cf" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/Wformat" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("/Wformat-security" ONEDNN_SDL_COMPILER_FLAGS)
         append(ONEDNN_SDL_LINKER_FLAGS "/link /NXCOMPAT")
     elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-        append(ONEDNN_SDL_COMPILER_FLAGS "-Wformat -Wformat-security")
+        test_compiler_and_add_flag("-Wformat" ONEDNN_SDL_COMPILER_FLAGS)
+        test_compiler_and_add_flag("-Wformat-security" ONEDNN_SDL_COMPILER_FLAGS)
         if(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
-            append(ONEDNN_SDL_COMPILER_FLAGS "-D_FORTIFY_SOURCE=2")
+            test_compiler_and_add_flag("-D_FORTIFY_SOURCE=2" ONEDNN_SDL_COMPILER_FLAGS)
         endif()
         get_filename_component(CXX_CMD_NAME ${CMAKE_CXX_COMPILER} NAME)
         # Fujitsu CXX compiler does not support "-fstack-protector-all".
         if(NOT CXX_CMD_NAME STREQUAL "FCC")
-            append(ONEDNN_SDL_COMPILER_FLAGS "-fstack-protector-all")
+            test_compiler_and_add_flag("-fstack-protector-all" ONEDNN_SDL_COMPILER_FLAGS)
         endif()
         append(ONEDNN_SDL_LINKER_FLAGS "-Xlinker /NXCOMPAT -Xlinker /LTCG")
     endif()

cmake/utils.cmake

@@ -174,3 +174,17 @@ function(find_libm var)
         find_library(${var} m REQUIRED)
     endif()
 endfunction()
+
+include(CheckCXXCompilerFlag)
+macro(test_compiler_and_add_flag flag var)
+    set(CMAKE_REQUIRED_QUIET 1)
+    unset(COMPILER_SUPPORTS_FLAG CACHE)
+
+    if(NOT test_compiler_flag_nowarn)
+        append(CMAKE_REQUIRED_FLAGS "${CMAKE_CCXX_NOWARN_FLAGS}")
+        set(test_compiler_flag_nowarn true)
+    endif()
+
+    check_cxx_compiler_flag("${flag}" COMPILER_SUPPORTS_FLAG)
+    append_if(COMPILER_SUPPORTS_FLAG ${var} ${flag})
+endmacro()