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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang on Windows: MSVC compatibility: #pragma fenv_access is not supported"
href="https://bugs.llvm.org/show_bug.cgi?id=50694">50694</a>
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<th>Summary</th>
<td>Clang on Windows: MSVC compatibility: #pragma fenv_access is not supported
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<th>Product</th>
<td>clang
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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
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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
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>pavel.morozkin@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>MSVC does not support #pragma STDC FENV_ACCESS ON:
cl t125.c /std:c11
t125.c(11): warning C4068: unknown pragma 'STDC'
Instead MSVC does support #pragma fenv_access (on). This leads to this code:
#if _MSC_VER
#pragma fenv_access (on)
#else
#pragma STDC FENV_ACCESS ON
#endif
Now try to compile this code using the latest Clang on Windows:
$ /cygdrive/d/SOFTWARE/LLVM/12.0.0/bin/clang t125.c -Wall -Wextra
t125.c:10:9: warning: unknown pragma ignored [-Wunknown-pragmas]
#pragma fenv_access (on)
Meaning that since #pragma fenv_access (on) is unknown pragma which is ignored,
then the MSVC compatibility is underdone / unfinished? Confused.
For Clang on Windows with MSVC compatibility enabled: please add support of
#pragma fenv_access.</pre>
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