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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - tgmath.h broken when compiling C with clang-cl"
href="https://bugs.llvm.org/show_bug.cgi?id=46207">46207</a>
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<th>Summary</th>
<td>tgmath.h broken when compiling C with clang-cl
</td>
</tr>
<tr>
<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>libc
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>stwish@microsoft.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The Universal CRT does not have a conforming complex.h. The tgmath.h header in
Clang
(<a href="https://github.com/llvm/llvm-project/blob/4cf5743b7784b2c2bff8be82e1a5cc37f8c68a36/clang/lib/Headers/tgmath.h">https://github.com/llvm/llvm-project/blob/4cf5743b7784b2c2bff8be82e1a5cc37f8c68a36/clang/lib/Headers/tgmath.h</a>)
assumes a conforming complex.h and therefore cannot be compiled by clang-cl
when building as C.
Repro:
**********************************************************************
** Visual Studio 2019 Developer Command Prompt v16.7.0-pre.3.0
** Copyright (c) 2020 Microsoft Corporation
**********************************************************************
C:\Users\stwish\source>set "PATH=C:\Program Files (x86)\Microsoft Visual
Studio\2019\Preview\VC\Tools\Llvm\bin;%PATH%"
C:\Users\stwish\source>type tgmath_repro.c
#include <tgmath.h>
int main()
{
return 0;
}
C:\Users\stwish\source>clang-cl tgmath_repro.c -ferror-limit=1
In file included from tgmath_repro.c:1:
C:\Program Files (x86)\Microsoft Visual
Studio\2019\Preview\VC\Tools\Llvm\lib\clang\10.0.0\include\tgmath.h(72,50):
error: passing
'_Complex float' to parameter of incompatible type '_Fcomplex' (aka
'struct _C_float_complex')
__tg_acos(float _Complex __x) {return cacosf(__x);}
^~~
C:\Program Files (x86)\Windows
Kits\10\include\10.0.19620.0\ucrt\complex.h(98,50): note: passing argument to
parameter '_Z' here
_ACRTIMP _Fcomplex __cdecl cacosf(_In_ _Fcomplex _Z);
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
2 errors generated.</pre>
</div>
</p>
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