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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Annex K functions"
href="https://bugs.llvm.org/show_bug.cgi?id=43848">43848</a>
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<th>Summary</th>
<td>Annex K functions
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>jeff.linahan@gmail.com
</td>
</tr>
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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>
<div>
<pre>I was expecting to see something along the lines of "Annex K functions not
supported" or "__STDC_LIB_EXT1__ not defined" if memcmp_s was not declared, but
clang seems to be ignoring the -std=c11 flag and interpreting this as C99 code
instead.
// memcmp.c
#define __STDC_WANT_LIB_EXT1__ 1
#include <string.h>
int main()
{
char dst[10], src[10];
memcmp_s(dst, 10, src, 10);
}
$ clang -std=c11 memcmp.c -o memcmp.exe
memcmp.c:7:2: warning: implicit declaration of function 'memcmp_s' is invalid
in C99 [-Wimplicit-function-declaration]
memcmp_s(dst, 10, src, 10);
^
1 warning generated.
/usr/bin/ld: /tmp/memcmp-b97369.o: in function `main':
memcmp.c:(.text+0x1c): undefined reference to `memcmp_s'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
This is clang 8.0.0-3 on x86_64-pc-linux-gnu</pre>
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