https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111258
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note clang rejects (libstdc++ version) for a different reason:
```
<source>:12:20: error: static assertion expression is not an integral constant
expression
12 | static_assert( foo("hello"s) == 'e' );
| ^~~~~~~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/14.0.0/../../../../include/c++/14.0.0/bits/basic_string.h:626:2:
note: undefined function '_M_construct<const char *>' cannot be used in a
constant expression
626 | _M_construct(__s, __s + __n, std::forward_iterator_tag());
| ^
/opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/14.0.0/../../../../include/c++/14.0.0/bits/basic_string.h:4686:14:
note: in call to 'basic_string(&"hello"[0], 5, std::allocator<char>())'
4686 | { return basic_string<char>{__str, __len}; }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<source>:12:24: note: in call to 'operator""s(&"hello"[0], 5)'
12 | static_assert( foo("hello"s) == 'e' );
| ^~~~~~~~
/opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/14.0.0/../../../../include/c++/14.0.0/bits/basic_string.h:336:9:
note: declared here
336 | _M_construct(_FwdIterator __beg, _FwdIterator __end,
| ^
```
clang accepts LLVM's libc++ version though.
