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<div>Thank you for confirming the issue. I did work around it. Btw, I had to set LIBOMP_CFLAGS and not LIBOMP_CXXFLAGS. </div>
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On Sep 11, 2016, at 11:03 PM, Hahnfeld, Jonas <<a href="mailto:Hahnfeld@itc.rwth-aachen.de">Hahnfeld@itc.rwth-aachen.de</a>> wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-stdlib=libc++ is needed if you wish to use libc++ on a Linux system that would otherwise require a recent version of libstdc++ from GCC.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The flag is currently passed in by the LLVM root build system but probably does not work because the .c files are compiled as C++.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Intel’s plan was to clean that up by the end of September which should fix the problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">In the meantime, could you try to specify LIBOMP_CXXFLAGS which should inject the parameters to the right places?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Note: The runtime does not really use or link against libc++ nor libstdc++ but clang requires the flag to actually find the atomic header…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Jonas<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Openmp-dev [<a href="mailto:openmp-dev-bounces@lists.llvm.org">mailto:openmp-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>Paul Osmialowski via Openmp-dev<br>
<b>Sent:</b> Friday, September 09, 2016 8:25 PM<br>
<b>To:</b> <a href="mailto:openmp-dev@lists.llvm.org">openmp-dev@lists.llvm.org</a><br>
<b>Subject:</b> Re: [Openmp-dev] LLVM 3.9 openmp build failure on linux -- cannot find atomic<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi Riyaz,<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>I'm always building LLVM OpenMP runtime with latest LLVM and Clang (from git master) and I on every of my Linux machines I never had to set any additional flags. What system are you building it on?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 09/03/16 05:07, Riyaz Puthiyapurayil via Openmp-dev wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:Consolas">With Release 3.9, kmp_lock.h is now including <atomic> under #ifdef __cplusplus. This wasn’t the case with Release 3.8.1. However, there are ‘.c’ files that are compiled as C++ files with ‘-x c++’ but
they are not compiled with -stdlib=libc++. As a result, clang does not find <atomic> and gives the following error:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">… Building C object projects/openmp/runtime/src/CMakeFiles/omp.dir/kmp_error.c.o</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">In file included from /remote/vgsource7/riyaz/llvm/projects/openmp/runtime/src/kmp_error.c:16:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">In file included from /remote/vgsource7/riyaz/llvm/projects/openmp/runtime/src/kmp.h:92:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">/remote/vgsource7/riyaz/llvm/projects/openmp/runtime/src/kmp_lock.h:26:10: fatal error: 'atomic' file not found</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">#include <atomic></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas"> ^</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">1 error generated.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">Should LIBOMP_USE_STDCPPLIB be set to TRUE?</span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"> <o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><i><span style="font-family:"Viner Hand ITC"">-Riyaz</span></i><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>Openmp-dev mailing list<o:p></o:p></pre>
<pre><a href="mailto:Openmp-dev@lists.llvm.org">Openmp-dev@lists.llvm.org</a><o:p></o:p></pre>
<pre><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev">http://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev</a><o:p></o:p></pre>
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