https://bugs.llvm.org/show_bug.cgi?id=41063
Bug ID: 41063
Summary: char8_t can't be mangled on Windows, but the
feature-test macro is defined
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: sfi...@hotmail.com
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
Using Clang 8 RC5 on Windows, the char8_t feature-test macro is defined, but
the type is unusable, which defeats the purpose of feature-test macros:
C:\Temp>type meow.cpp
#include <stdio.h>
template <typename T>
struct Meow { };
template <typename U>
void woof(U) { }
int main() {
#ifdef __cpp_char8_t
puts("__cpp_char8_t defined");
Meow<char8_t> m;
woof(m);
#else
puts("__cpp_char8_t NOT defined");
#endif
}
C:\Temp>cl /EHsc /nologo /W4 /std:c++latest meow.cpp && meow
meow.cpp
__cpp_char8_t NOT defined
C:\Temp>cl /EHsc /nologo /W4 /std:c++latest /Zc:char8_t meow.cpp && meow
meow.cpp
__cpp_char8_t defined
C:\Temp>clang-cl -m32 /EHsc /nologo /W4 /std:c++latest meow.cpp && meow
error: cannot mangle this built-in char8_t type yet
error: cannot mangle this built-in char8_t type yet
2 errors generated.
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