https://bugs.llvm.org/show_bug.cgi?id=50146
Bug ID: 50146
Summary: std::call_once always segfaults on MinGW (regression
11->12)
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Any use of `std::call_once` on MinGW causes a segfault. It used to work in
Clang 11, but broke in 12.
Minimal example:
#include <iostream>
#include <mutex>
int main()
{
std::once_flag flag;
std::call_once(flag, []{std::cout << "Once!\n";});
}
The clang version is: Ubuntu clang version
12.0.1-++20210423082613+072c90a863aa-1~exp1~20210423063319.76
The flags I use: clang++-12 --version --target=x86_64-w64-mingw32
--sysroot=/mingw64 -pthread -femulated-tls
The libstdc++ comes from MSYS2 GCC 10.2.0 (rev 10).
Here's what GDB says if I add `-g`:
Program received signal SIGSEGV, Segmentation fault.
0x00000001e014dc4a in ?? () from
Z:\home\holyblackcat\Sandbox\2\libgcc_s_seh-1.dll
(gdb) bt
#0 0x00000001e014dc4a in ?? () from
Z:\home\holyblackcat\Sandbox\2\libgcc_s_seh-1.dll
#1 0x00000000004015f3 in std::call_once<main::$_0> (__once=..., __f=...)
at /mingw64/include/c++/10.2.0/mutex:721
#2 0x00000000004015b5 in main () at 1.cpp:8
(gdb) f 1
#1 0x00000000004015f3 in std::call_once<main::$_0> (__once=..., __f=...)
at /mingw64/include/c++/10.2.0/mutex:721
721 __once_callable = std::__addressof(__callable);
(gdb) list
716 auto __callable = [&] {
717 std::__invoke(std::forward<_Callable>(__f),
718 std::forward<_Args>(__args)...);
719 };
720 #ifdef _GLIBCXX_HAVE_TLS
721 __once_callable = std::__addressof(__callable);
722 __once_call = []{
(*(decltype(__callable)*)__once_callable)(); };
723 #else
724 unique_lock<mutex> __functor_lock(__get_once_mutex());
725 __once_functor = __callable;
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