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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - char8_t can't be mangled on Windows, but the feature-test macro is defined"
href="https://bugs.llvm.org/show_bug.cgi?id=41063">41063</a>
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<th>Summary</th>
<td>char8_t can't be mangled on Windows, but the feature-test macro is defined
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>sfinae@hotmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>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.</pre>
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