[OpenMP] [cmake] Don't use -fno-semantic-interposition on Windows (#81113)
This was added in 4b7beab4187ab0766c3d7b272511d5751431a8da. When the
flag was added implicitly elsewhere, it was added via
llvm/cmake/modules/HandleLLVMOptions.cmake, where it wasn't added on
Windows/Cygwin targets.
This avoids one warning per object file in OpenMP.
GitOrigin-RevId: 72f04fa0734f8559ad515f507a4a3ce3f461f196
diff --git a/cmake/HandleOpenMPOptions.cmake b/cmake/HandleOpenMPOptions.cmake
index 7134620..9387d9b 100644
--- a/cmake/HandleOpenMPOptions.cmake
+++ b/cmake/HandleOpenMPOptions.cmake
@@ -46,7 +46,11 @@
append_if(OPENMP_HAVE_WPEDANTIC_FLAG "-Wno-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append_if(OPENMP_HAVE_WMAYBE_UNINITIALIZED_FLAG "-Wno-maybe-uninitialized" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
-append_if(OPENMP_HAVE_NO_SEMANTIC_INTERPOSITION "-fno-semantic-interposition" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+if (NOT (WIN32 OR CYGWIN))
+ # This flag is not relevant on Windows; the flag is accepted, but produces warnings
+ # about argument unused during compilation.
+ append_if(OPENMP_HAVE_NO_SEMANTIC_INTERPOSITION "-fno-semantic-interposition" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+endif()
append_if(OPENMP_HAVE_FUNCTION_SECTIONS "-ffunction-section" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append_if(OPENMP_HAVE_DATA_SECTIONS "-fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
