[SPEC] Work around build failure due to target OS macros changes.

llvm/llvm-project#74676 changes some predefined
target OS macros on Apple platforms, which breaks building both Blender
and Povray.

Work around build failures by adding -fno-define-target-os-macros if
available.

Author: fhahn

External/SPEC/CFP2017rate/511.povray_r/CMakeLists.txt

@@ -8,6 +8,17 @@ speccpu2017_benchmark(RATE)
 
 speccpu2017_add_include_dirs(frontend base . spec_qsort)
 
+if(APPLE)
+    # Building Povray breaks with -fdefine-target-os-macros, add flag to disable
+  # it as workaround.
+  include(CheckCCompilerFlag)
+  check_c_compiler_flag(-fno-define-target-os-macros
+                        COMPILER_HAS_NO_DEFINE_TARGET_OS_MACROS)
+  if (COMPILER_HAS_NO_DEFINE_TARGET_OS_MACROS)
+    add_compile_options(-fno-define-target-os-macros)
+  endif()
+endif()
+
 ## test ########################################################################
 
 speccpu2017_run_test(

External/SPEC/CFP2017rate/526.blender_r/CMakeLists.txt

@@ -14,6 +14,18 @@ add_definitions(
   -DWITH_HEADLESS
   -DHAVE_UNSIGNED_CHAR
 )
+
+if(APPLE)
+  # Building Blender breaks with -fdefine-target-os-macros, add flag to disable
+  # it as workaround.
+  include(CheckCXXCompilerFlag)
+  check_cxx_compiler_flag(-fno-define-target-os-macros
+                        COMPILER_HAS_NO_DEFINE_TARGET_OS_MACROS)
+  if (COMPILER_HAS_NO_DEFINE_TARGET_OS_MACROS)
+    add_compile_options(-fno-define-target-os-macros)
+  endif()
+endif()
+
 add_compile_options(-funsigned-char)
 add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-D__BOOL_DEFINED>)
 speccpu2017_add_include_dirs(