[Openmp-commits] [openmp] [openmp] On Windows, fix standalone cmake build (PR #80174)

[Alexandre Ganea via Openmp-commits]

https://github.com/aganea updated https://github.com/llvm/llvm-project/pull/80174

>From 5d67ce4a790818d2316787209160d9528db795f9 Mon Sep 17 00:00:00 2001
From: Alexandre Ganea <alex_toresh at yahoo.fr>
Date: Wed, 31 Jan 2024 13:22:19 -0500
Subject: [PATCH 1/2] [openmp] On Windows, fix standalone cmake build

This fixes: https://github.com/llvm/llvm-project/issues/80117
---
 openmp/cmake/HandleOpenMPOptions.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/openmp/cmake/HandleOpenMPOptions.cmake b/openmp/cmake/HandleOpenMPOptions.cmake
index 201aeabbd3df9..79dfa334d749e 100644
--- a/openmp/cmake/HandleOpenMPOptions.cmake
+++ b/openmp/cmake/HandleOpenMPOptions.cmake
@@ -44,9 +44,9 @@ append_if(OPENMP_HAVE_DATA_SECTIONS "-fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FL
 
 if (MSVC)
   # Disable "warning C4201: nonstandard extension used: nameless struct/union"
-  append("-wd4201" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+  append_if(TRUE "-wd4201" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   
   # Disable "warning C4190: '__kmpc_atomic_cmplx8_rd' has C-linkage specified, but returns
   # UDT '__kmp_cmplx64_t' which is incompatible with C"
-  append("-wd4190" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+  append_if(TRUE "-wd4190" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
 endif()

>From 196f1332753f53aa62d0ff6cbd01012f53df008f Mon Sep 17 00:00:00 2001
From: Alexandre Ganea <alex_toresh at yahoo.fr>
Date: Wed, 31 Jan 2024 16:10:21 -0500
Subject: [PATCH 2/2] [openmp][cmake] Add 'append' cmake command if it's not
 already there

---
 openmp/cmake/HandleOpenMPOptions.cmake | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/openmp/cmake/HandleOpenMPOptions.cmake b/openmp/cmake/HandleOpenMPOptions.cmake
index 79dfa334d749e..72fea70e5ea21 100644
--- a/openmp/cmake/HandleOpenMPOptions.cmake
+++ b/openmp/cmake/HandleOpenMPOptions.cmake
@@ -9,6 +9,14 @@ if (NOT COMMAND append_if)
   endfunction()
 endif()
 
+if (NOT COMMAND append)
+  function(append value)
+    foreach(variable ${ARGN})
+      set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
+    endforeach(variable)
+  endfunction()
+endif()
+
 # MSVC and clang-cl in compatibility mode map -Wall to -Weverything.
 # TODO: LLVM adds /W4 instead, check if that works for the OpenMP runtimes.
 if (NOT MSVC)
@@ -44,9 +52,9 @@ append_if(OPENMP_HAVE_DATA_SECTIONS "-fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FL
 
 if (MSVC)
   # Disable "warning C4201: nonstandard extension used: nameless struct/union"
-  append_if(TRUE "-wd4201" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+  append("-wd4201" CMAKE_C_FLAGS CMAKE_CXX_FLAGS )
   
   # Disable "warning C4190: '__kmpc_atomic_cmplx8_rd' has C-linkage specified, but returns
   # UDT '__kmp_cmplx64_t' which is incompatible with C"
-  append_if(TRUE "-wd4190" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+  append("-wd4190" CMAKE_C_FLAGS CMAKE_CXX_FLAGS )
 endif()