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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 - 'clang -fopenmp' complains about missing '-lomp', missing headers"
href="https://bugs.llvm.org/show_bug.cgi?id=36675">36675</a>
</td>
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<th>Summary</th>
<td>'clang -fopenmp' complains about missing '-lomp', missing headers
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Clang Compiler Support
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kevinushey@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>On macOS, using the binaries available from
<a href="http://releases.llvm.org/download.html">http://releases.llvm.org/download.html</a>, attempts to (naively?) compile a
program using OpenMP fail:
kevin@cdrv:~/scratch
$ ~/Desktop/clang+llvm-6.0.0-x86_64-apple-darwin/bin/clang -fopenmp
omp_hello.c
ld: library not found for -lomp
clang-6.0: error: linker command failed with exit code 1 (use -v to see
invocation)
This is in spite of the fact that LLVM ships 'libomp.dylib':
kevin@cdrv:~/Desktop/clang+llvm-6.0.0-x86_64-apple-darwin
$ find . -name "libomp.dylib"
./lib/libomp.dylib
Could / should clang append the library path containing 'libomp.dylib' when
compiling with OpenMP support?
I see similar behavior on other platforms where clang is distributed; e.g. on
my Ubuntu 16.04 VM with clang 3.8.0-2ubuntu4 I see:
kevin@ubuntu:~/scratch
$ clang -fopenmp omp_hello.c
omp_hello.c:1:10: fatal error: 'omp.h' file not found
#include <omp.h>
^
1 error generated.
kevin@ubuntu:~/scratch
$ clang -I/usr/lib/gcc/x86_64-linux-gnu/5/include -fopenmp omp_hello.c
/usr/bin/ld: cannot find -lomp
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
It would be nice if attempts to use '-fopenmp' with clang would 'just work'
without extra fussing with the include + library paths, as it does with gcc.</pre>
</div>
</p>
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