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From c828ae47b8f4bea7736d2f9d05460e2b529c9d7d Mon Sep 17 00:00:00 2001
From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Date: Fri, 9 Dec 2022 12:36:11 +0100
Subject: [PATCH] Add cmake check for libatomic requirement when building with
gcc (#980)
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
---
cmake/compilers/GNU.cmake | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/cmake/compilers/GNU.cmake b/cmake/compilers/GNU.cmake
index cd76acfe1e..59f4e6934f 100644
--- a/cmake/compilers/GNU.cmake
+++ b/cmake/compilers/GNU.cmake
@@ -44,6 +44,22 @@ if (NOT MINGW)
set(TBB_COMMON_LINK_LIBS dl)
endif()
+# Check whether code with full atomics can be built without libatomic
+# see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81358
+include(CheckCXXSourceCompiles)
+check_cxx_source_compiles("#include <atomic>
+int main() {
+ std::atomic<uint8_t> w1;
+ std::atomic<uint16_t> w2;
+ std::atomic<uint32_t> w4;
+ std::atomic<uint64_t> w8;
+ return ++w1 + ++w2 + ++w4 + ++w8;
+}" TBB_BUILDS_WITHOUT_LIBATOMIC)
+
+if(NOT TBB_BUILDS_WITHOUT_LIBATOMIC)
+ set(TBB_COMMON_LINK_LIBS ${TBB_COMMON_LINK_LIBS} atomic)
+endif()
+
# Ignore -Werror set through add_compile_options() or added to CMAKE_CXX_FLAGS if TBB_STRICT is disabled.
if (NOT TBB_STRICT AND COMMAND tbb_remove_compile_flag)
tbb_remove_compile_flag(-Werror)
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