From 43e4e35f8f003da6dec612053e59aa162f156be1 Mon Sep 17 00:00:00 2001
From: Dominik Thoennes <dominik.thoennes@fau.de>
Date: Mon, 6 Sep 2021 13:37:53 +0200
Subject: [PATCH] add check for llvm bug and disable sign-conversion warning if
needed
---
CMakeLists.txt | 9 +++++++++
cmake/TestClangOpenMPBug.cpp | 14 ++++++++++++++
2 files changed, 23 insertions(+)
create mode 100644 cmake/TestClangOpenMPBug.cpp
diff --git a/CMakeLists.txt b/CMakeLists.txt
index cd001a937..c1a0bb29f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1033,6 +1033,15 @@ if ( WALBERLA_BUILD_WITH_OPENMP )
message(FATAL_ERROR "Could NOT enable OpenMP")
endif()
endif()
+
+ # check for bug in combination with OpenMP and sign conversion https://bugs.llvm.org/show_bug.cgi?id=48387
+ try_compile( WALBERLA_CLANG_OPENMP_BUG "${CMAKE_CURRENT_BINARY_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/cmake/TestClangOpenMPBug.cpp"
+ COMPILE_DEFINITIONS -Werror)
+ if ( NOT ${WALBERLA_CLANG_OPENMP_BUG} )
+ message(WARNING "Setting -Wno-sign-conversion due to a compiler bug in LLVM (https://bugs.llvm.org/show_bug.cgi?id=48387)" )
+ add_flag ( CMAKE_CXX_FLAGS "-Wno-sign-conversion" )
+ endif()
+
else()
if ( WALBERLA_CXX_COMPILER_IS_CRAY )
add_flag ( CMAKE_C_FLAGS "-h noomp" )
diff --git a/cmake/TestClangOpenMPBug.cpp b/cmake/TestClangOpenMPBug.cpp
new file mode 100644
index 000000000..c9cfa1eef
--- /dev/null
+++ b/cmake/TestClangOpenMPBug.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+
+int main()
+{
+ int min = -10;
+
+#pragma omp parallel for
+ for (int i = min; i <= 10; ++i)
+ {
+ std::cout << i << std::endl;
+ }
+
+ return 0;
+}
\ No newline at end of file
--
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