In ucrt64, quick_exit is not found.
#include <cstdlib>
int main()
{
std::quick_exit(0);
}
$g++ -o fail1.exe -std=c++11 -Wall -Wextra -pedantic fail1.cpp
fail1.cpp: In function 'int main()':
fail1.cpp:4:7: error: 'quick_exit' is not a member of 'std'
4 | std::quick_exit(0);
| ^~~~~~~~~~
#include <stdlib.h>
int main(void)
{
quick_exit(0);
}
$gcc -o fail2.exe -std=c11 -Wall -Wextra -pedantic fail2.c
fail2.c: In function 'main':
fail2.c:4:2: warning: implicit declaration of function 'quick_exit'
[-Wimplicit-function-declaration]
4 | quick_exit(0);
| ^~~~~~~~~~
However, ucrt runtime provides it so that when I manually add declaration, I
can use it.
extern "C" [[noreturn]] void quick_exit(int) noexcept;
int main()
{
quick_exit(0);
}
$g++ -o main.exe -std=c++11 -Wall -Wextra -pedantic main.cpp
$./main.exe
In cstdlib header, we can find the declaration but it is for a free-standing
environment or using quick_exit of the global namespace.
$cat -n /ucrt64/include/c++/10.2.0/cstdlib | head -n 66 | tail -n 3
64 # ifdef _GLIBCXX_HAVE_QUICK_EXIT
65 extern "C" void quick_exit(int) throw() _GLIBCXX_NORETURN;
66 # endif
$cat -n /ucrt64/include/c++/10.2.0/cstdlib | head -n 161 | tail -n 3
159 # ifdef _GLIBCXX_HAVE_QUICK_EXIT
160 using ::quick_exit;
161 # endif
And I cannot find the global quick_exit declaration.
$cat -n /ucrt64/x86_64-w64-mingw32/include/stdlib.h | grep quick_exit
So, even though I manually define _GLIBCXX_HAVE_QUICK_EXIT macro, I can't use
that.
Is there any place tracing this issue?
note: This issue was transferred from
https://github.com/msys2/MINGW-packages/issues/8425
--
yumetodo <[email protected]>
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