[llvm-branch-commits] [openmp] d7c6794 - [OpenMP] [cmake] Don't use -fno-semantic-interposition on Windows (#81113)

[Tom Stellard via llvm-branch-commits]

Author: Martin Storsjö
Date: 2024-02-16T04:40:41-08:00
New Revision: d7c6794aff6625c420a719d64402827cbae55292

URL: https://github.com/llvm/llvm-project/commit/d7c6794aff6625c420a719d64402827cbae55292
DIFF: https://github.com/llvm/llvm-project/commit/d7c6794aff6625c420a719d64402827cbae55292.diff

LOG: [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.

(cherry picked from commit 72f04fa0734f8559ad515f507a4a3ce3f461f196)

Added: 
    

Modified: 
    openmp/cmake/HandleOpenMPOptions.cmake

Removed: 
    


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diff  --git a/openmp/cmake/HandleOpenMPOptions.cmake b/openmp/cmake/HandleOpenMPOptions.cmake
index 71346201129b68..9387d9b3b0ff75 100644
--- a/openmp/cmake/HandleOpenMPOptions.cmake
+++ b/openmp/cmake/HandleOpenMPOptions.cmake
@@ -46,7 +46,11 @@ append_if(OPENMP_HAVE_WEXTRA_FLAG "-Wno-extra" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
 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)