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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 - -fsanitize-coverage=trace-pc-guard errors when a c file defines more than one function w/ extern linkage"
href="https://bugs.llvm.org/show_bug.cgi?id=38370">38370</a>
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<th>Summary</th>
<td>-fsanitize-coverage=trace-pc-guard errors when a c file defines more than one function w/ extern linkage
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>scott.determan@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>If a c file defines more than one function with external linkage, and
`-fsanitize-coverage=trace-pc-guard` is set then the compiled program will
either crash (if the lld linker is used) or fail to compile (if it is not
used).
The link error is:
Link error is:
[1/2] Linking CXX executable two_c_funs FAILED: two_c_funs : &&
/home/swd/apps/clang-6.0/bin/clang++ -fsanitize=fuzzer
-fsanitize-coverage=trace-pc-guard -rdynamic
CMakeFiles/two_c_funs.dir/test.cpp.o CMakeFiles/two_c_funs.dir/two_c_funs.c.o
-o two_c_funs && : .text.sancov.module_ctor.6' referenced in
section.init_array.2[sancov.module_ctor.6]' of
CMakeFiles/two_c_funs.dir/two_c_funs.c.o: defined in discarded section
`.text.sancov.module_ctor.6[sancov.module_ctor]' of
CMakeFiles/two_c_funs.dir/two_c_funs.c.o clang-6.0: error: linker command
failed with exit code 1 (use -v to see invocation) [2/2] Linking CXX executable
one_c_fun ninja: build stopped: subcommand failed.
I created a minimal test in this repository:
<a href="https://github.com/seelabs/sanitizer_coverage_bug">https://github.com/seelabs/sanitizer_coverage_bug</a></pre>
</div>
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