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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Signaling NaNs are seem supported but __SUPPORT_SNAN__ is not defined"
href="https://bugs.llvm.org/show_bug.cgi?id=52577">52577</a>
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<th>Summary</th>
<td>Signaling NaNs are seem supported but __SUPPORT_SNAN__ is not defined
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>13.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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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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<pre>Note: this may not be a bug, but the subject needs a clarification.
This code:
#define _WANT_SNAN
#ifdef __SUPPORT_SNAN__
#pragma message "__SUPPORT_SNAN__ is defined"
#else
#pragma message "__SUPPORT_SNAN__ is not defined"
#endif
compiled with:
$ clang -std=c11 -pedantic -Wall -Wextra -ffp-model=strict -c
leads to:
<source>:5:9: warning: __SUPPORT_SNAN__ is not defined [-W#pragma-messages]
However, according to some tests signaling NaNs are supported.
Then what is the real reason to not define __SUPPORT_SNAN__?
It may be useful to mention the status of support of signaling NaNs in User's
Manual: <a href="https://clang.llvm.org/docs/UsersManual.html">https://clang.llvm.org/docs/UsersManual.html</a>.
Version: clang 13.0.0 on x86_64 on Linux</pre>
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