https://llvm.org/bugs/show_bug.cgi?id=26911
Bug ID: 26911
Summary: atomic types not trivially-copyable when clang targets
mingw-w64
Product: clang
Version: 3.8
Hardware: PC
OS: Windows XP
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: jibz-llvmb...@stdip.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code:
#include <stdatomic.h>
atomic_int foo;
void store(int val)
{
atomic_store(&foo, val);
}
fails when compiled with clang using mingw-w64 (GCC 5.3.0) headers with:
foo.c:5:2: error: address argument to atomic operation must be a pointer to
a trivially-copyable type ('_Atomic(int) *' invalid)
atomic_store(&foo, val);
^~~~~~~~~~~~~~~~~~~~~~~
C:\mingw64\mingw64\lib\gcc\x86_64-w64-mingw32\5.3.0\include\stdatomic.h:130:3:
note:
expanded from macro 'atomic_store'
atomic_store_explicit (PTR, VAL, __ATOMIC_SEQ_CST)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\mingw64\mingw64\lib\gcc\x86_64-w64-mingw32\5.3.0\include\stdatomic.h:126:5:
note:
expanded from macro 'atomic_store_explicit'
__atomic_store (__atomic_store_ptr, &__atomic_store_tmp, (MO)); \
^ ~~~~~~~~~~~~~~~~~~
1 error generated.
I tried both the official installer using --target=x86_64-w64-mingw32 to target
my mingw-w64 install, and using clang in MSYS2 which targets their GCC.
Near line 126 of stdatomic.h, there is a comment about these macros expecting
__typeof__ and __auto_type to remove _Atomic specifier. If I make foo a regular
int it compiles.
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