| Issue |
61444
|
| Summary |
"Illegal instruction" error when compiling code with std::function in clang
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
DD-L
|
Hello,
Can someone explain this?
The following code can be compiled using `gcc`/`MSVC` and the resulting program can work normally, outputting the number `1` :
```
#include <functional>
#include <iostream>
#include <string>
typedef std::function<void(int, const std::string&, int)> Fn;
void foo(int a, ...) {
std::cout << a << std::endl;
}
int main() {
Fn fn(foo);
fn(1, "str", 3);
return 0;
}
```
However, in almost all versions of clang (`<= ver 15.0.0`), the resulting program reports an "`Illegal instruction`" error. Is this considered a bug in clang?
Details:
```
* thread #1, name = 'a.out', stop reason = signal SIGILL: illegal instruction operand
frame #0: 0x00005555555557e6 a.out`void std::__invoke_impl<void, void (*&)(int, ...), int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int>((null)=__invoke_other @ 0x00007fffffffe038, __f=0x00007fffffffe198, __args=0x00007fffffffe134, __args=0x00007fffffffe178, __args=0x00007fffffffe124)(int, ...), int&&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int&&) at invoke.h:61:37
58 template<typename _Res, typename _Fn, typename... _Args>
59 constexpr _Res
60 __invoke_impl(__invoke_other, _Fn&& __f, _Args&&... __args)
-> 61 { return std::forward<_Fn>(__f)(std::forward<_Args>(__args)...); }
62
63 template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
64 constexpr _Res
(lldb) bt
* thread #1, name = 'a.out', stop reason = signal SIGILL: illegal instruction operand
* frame #0: 0x00005555555557e6 a.out`void std::__invoke_impl<void, void (*&)(int, ...), int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int>((null)=__invoke_other @ 0x00007fffffffe038, __f=0x00007fffffffe198, __args=0x00007fffffffe134, __args=0x00007fffffffe178, __args=0x00007fffffffe124)(int, ...), int&&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int&&) at invoke.h:61:37
frame #1: 0x000055555555574c a.out`std::enable_if<__and_<std::is_void<void>, std::__is_invocable<void (*&)(int, ...), int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int> >::value, void>::type std::__invoke_r<void, void (__fn=0x00007fffffffe198, __args=0x00007fffffffe134, __args=0x00007fffffffe178, __args=0x00007fffffffe124)(int, ...), int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int>(void (*&)(int, ...), int&&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int&&) at invoke.h:154:7
frame #2: 0x00005555555555fc a.out`std::_Function_handler<void (int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int), void (*)(int, ...)>::_M_invoke(__functor=0x00007fffffffe198, __args=0x00007fffffffe134, __args=0x00007fffffffe178, __args=0x00007fffffffe124) at std_function.h:290:9
frame #3: 0x000055555555547d a.out`std::function<void (int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)>::operator(this=0x00007fffffffe198, __args=1, __args=0x00007fffffffe178, __args=3)(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int) const at std_function.h:590:9
frame #4: 0x00005555555552cc a.out`main at 1.cpp:13:5
frame #5: 0x00007ffff7a86d90 libc.so.6`__libc_start_call_main(main=(a.out`main at 1.cpp:11), argc=1, argv=0x00007fffffffe2d8) at libc_start_call_main.h:58:16
frame #6: 0x00007ffff7a86e40 libc.so.6`__libc_start_main_impl(main=(a.out`main at 1.cpp:11), argc=1, argv=0x00007fffffffe2d8, init=0x00007ffff7ffd040, fini=<unavailable>, rtld_fini=<unavailable>, stack_end=0x00007fffffffe2c8) at libc-start.c:392:3
frame #7: 0x0000555555555175 a.out`_start + 37
```
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