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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __STDC_IEC_559__ depends on #include <stdio.h>: confused"
href="https://bugs.llvm.org/show_bug.cgi?id=52533">52533</a>
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<th>Summary</th>
<td>__STDC_IEC_559__ depends on #include <stdio.h>: confused
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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>Linux
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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>Note: this may not be a bug. However, it is expected that __STDC_IEC_559__ does
not depend on any #include and stays constant during the translation.
This code:
#include FNAME
#if __STDC_IEC_559__ == 1
#pragma message "__STDC_IEC_559__ is 1"
#else
#pragma message "__STDC_IEC_559__ is not 1"
#endif
compiled with:
$ clang t0.c -std=c11 -pedantic -Wall -Wextra -DFNAME="<stdio.h>"
leads to:
t0.c:3:9: warning: __STDC_IEC_559__ is 1 [-W#pragma-messages]
while compiled with:
$ clang t0.c -std=c11 -pedantic -Wall -Wextra -DFNAME="<float.h>"
leads to:
t0.c:3:9: warning: __STDC_IEC_559__ is not 1 [-W#pragma-messages]
Here we see that the value of __STDC_IEC_559__ depends on #include. Which is
confusing. Please explain / investigate.
Version: clang 13.0.0 on Linux on x86_64</pre>
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