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Try to add this path to LIBRARY_PATH env var. <br>
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<div dir="ltr">Best regards,
<div>Alexey Bataev</div>
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<blockquote type="cite">22 дек. 2020 г., в 21:22, Керим Хемраев via cfe-dev <cfe-dev@lists.llvm.org> написал(а):<br>
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<div>Thank you very much!</div>
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<div>I’ve figured out that I have <strong>libpthread.so.0</strong> in <strong>/usr/lib/x86_64-linux-gnu</strong></div>
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<div>So I can compile it with command:</div>
<div><em>$ clang++ -fopenmp foo.cxx -I/home/../usr/lib/llvm-10/include/openmp/ -L/home/../usr/lib/llvm-10/lib -L/home/../usr/lib/x86_64-linux-gnu</em></div>
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<div>Is there a way to change that <strong>/usr/bin/ld</strong> looks for <strong>libpthread.so.0</strong> in <strong>/usr/lib/x86_64-linux-gnu</strong> instead of<strong> /lib64
</strong>?</div>
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Среда, 23 декабря 2020, 5:13 +03:00 от Johannes Doerfert <johannesdoerfert@gmail.com>:<br>
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<div id="style_16086896290846643755_BODY">Maybe install libpthread-dev?<br>
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<br>
On 12/22/20 8:07 PM, Керим Хемраев wrote:
<div class="mail-quote-collapse">> Yes, it is<br>
><br>
> The command:<br>
><br>
> $ clang++ -fopenmp foo.cxx -I/home/../usr/lib/llvm-10/include/openmp/ -L/home/../usr/lib/llvm-10/lib<br>
><br>
> gives the error:<br>
> /usr/bin/ld: cannot find /lib64/libpthread.so.0<br>
> /usr/bin/ld: cannot find /usr/lib64/libpthread_nonshared.a<br>
> clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)<br>
><br>
><br>
><br>
>> Среда, 23 декабря 2020, 5:02 +03:00 от Johannes Doerfert <<a href="/compose?To=johannesdoerfert@gmail.com">johannesdoerfert@gmail.com</a>>:<br>
>><br>
>> Ok, closer. is there a symlink from libomp.so to libomp.so.5 in<br>
>> /home/../usr/lib/llvm-10/lib ?<br>
>> If not, create one. Then try:<br>
>><br>
>> clang++ -fopenmp foo.cxx -I/home/../usr/lib/llvm-10/include/openmp/ -L/home/../usr/lib/llvm-10/lib<br>
>><br>
>><br>
>><br>
>> On 12/22/20 8:00 PM, Керим Хемраев wrote:<br>
>>> $ clang++ -fopenmp foo.cxx<br>
>>><br>
>>> gives:<br>
>>> foo.cxx:2:10: fatal error: 'omp.h' file not found<br>
>>> #include "omp.h"<br>
>>> ^~~~~~~<br>
>>> 1 error generated.<br>
>>><br>
>>><br>
>>> Then I try:<br>
>>><br>
>>> $ clang++ -fopenmp foo.cxx -I/home/../usr/lib/llvm-10/include/openmp/<br>
>>><br>
>>> this produces the error:<br>
>>> /usr/bin/ld: cannot find -lomp<br>
>>> clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)<br>
>>><br>
>>> The dir: -I/home/../usr/lib/llvm-10/include/openmp/ contains omp.h<br>
>>><br>
>>>> Среда, 23 декабря 2020, 4:56 +03:00 от Johannes Doerfert < <a href="/compose?To=johannesdoerfert@gmail.com">
johannesdoerfert@gmail.com</a> >:<br>
>>>><br>
>>>> -fopenmp will add the -lomp, which will look for libomp.so in your<br>
>>>> library path.<br>
>>>><br>
>>>> Again, libomp.so versioning is not related to clang versioning.<br>
>>>><br>
>>>> What is the output of<br>
>>>><br>
>>>> clang++ -fopenmp foo.cxx<br>
>>>><br>
>>>><br>
>>>><br>
>>>> On 12/22/20 7:33 PM, Керим Хемраев wrote:<br>
>>>>> It seems I know where is my fault (it<br>
>>>>><br>
>>>>><br>
>>>>> using clang 5.0 with libomp.so.5 is probably not going to work.<br>
>>>>><br>
>>>>> is was very obvious) but I can’t understand how can I link external library to clang.<br>
>>>>><br>
>>>>> In the folder /home/../usr/lib/llvm-10/lib I have a file called libomp.so.5 (as I understood it is a library of version 5) and I strongly believe that I need to link this library when parsing commands to clang++:<br>
>>>>><br>
>>>>> $ clang++ -fopenmp foo.cxx -I/home/../usr/lib/llvm-10/include/openmp/ -L/home/../usr/lib/llvm-10/lib libomp.so.5<br>
>>>>><br>
>>>>> gives me error:<br>
>>>>> clang-5.0: error: no such file or directory: 'libomp.so.5'<br>
>>>>><br>
>>>>> How to link libomp.so.5 ? Can’t find it in google yet<br>
>>>>><br>
>>>>><br>
>>>>>> Среда, 23 декабря 2020, 2:33 +03:00 от Johannes Doerfert < <a href="/compose?To=johannesdoerfert@gmail.com">
johannesdoerfert@gmail.com</a> >:<br>
>>>>>><br>
>>>>>> I think libomp is still on version 5.0, (I know, I know).<br>
>>>>>> It is not coupled to LLVM wrt. version numbers.<br>
>>>>>><br>
>>>>>> Last time I checked, LLVM build for debian (and Ububuntu)<br>
>>>>>> came bundled with the OpenMP runtimes (for the host). That<br>
>>>>>> means you should not need libomp-5-dev but just clang-10.<br>
>>>>>> libomp-5-dev is useful if you *don't* want clang but still<br>
>>>>>> target libomp, which is the LLVM OpenMP host runtime, from<br>
>>>>>> gcc, thus use it as a replacement of libgomp.<br>
>>>>>><br>
>>>>>> All that said, doesn't `clang-10 -fopenmp ...` "just work"?<br>
>>>>>><br>
>>>>>> ~ Johannes<br>
>>>>>><br>
>>>>>><br>
>>>>>> On 12/22/20 5:28 PM, Керим Хемраев wrote:<br>
>>>>>>> Hi Johannes,<br>
>>>>>>><br>
>>>>>>> Thank you for response<br>
>>>>>>><br>
>>>>>>> It seems that I don’t have libthread. Moreover it is highly likely that omp.h and libomp.so that I used to provide as parameters to clang are not shipped with clang 5 :)<br>
>>>>>>><br>
>>>>>>> I think I should now forget about xeus-cling for a while and simply build the code with latest (or any) version of clang with OpenMP.<br>
>>>>>>><br>
>>>>>>> I’ve tried to do the following:<br>
>>>>>>> $ sudo apt-get install clang-10<br>
>>>>>>> $ sudo apt-get install libomp-5-dev<br>
>>>>>>><br>
>>>>>>> Now I want to find where are these packages were installed:<br>
>>>>>>> $ find /usr -iname clang-10<br>
>>>>>>> /usr/lib/llvm-10/bin/clang-10<br>
>>>>>>> /usr/lib/cmake/clang-10<br>
>>>>>>> /usr/share/doc/clang-10<br>
>>>>>>> /usr/share/bash-completion/completions/clang-10<br>
>>>>>>> /usr/share/lintian/overrides/clang-10<br>
>>>>>>> /usr/bin/clang-10<br>
>>>>>>><br>
>>>>>>> $ find /usr -iname libomp-10-dev<br>
>>>>>>> /usr/share/doc/libomp-10-dev<br>
>>>>>>><br>
>>>>>>> So I’m afraid that libomp-10-dev contains only some docs and there is no library libomp-10-dev.so (or something)<br>
>>>>>>><br>
>>>>>>> Could you please guide me how to properly install clang with OpenMP that I could build my test script?<br>
>>>>>>><br>
>>>>>>> I’m on Ubuntu 20.04, x64<br>
>>>>>>> $ cat /etc/lsb-release<br>
>>>>>>> DISTRIB_ID=Ubuntu<br>
>>>>>>> DISTRIB_RELEASE=20.04<br>
>>>>>>> DISTRIB_CODENAME=focal<br>
>>>>>>> DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"<br>
>>>>>>><br>
>>>>>>>> Среда, 23 декабря 2020, 0:48 +03:00 от Johannes Doerfert < <a href="/compose?To=johannesdoerfert@gmail.com">
johannesdoerfert@gmail.com</a> >:<br>
>>>>>>>><br>
>>>>>>>> Hi Kerim,<br>
>>>>>>>><br>
>>>>>>>> I tried to help below. Looking at xeus-cling I did not immediately see<br>
>>>>>>>> why clang 5 is<br>
>>>>>>>> required. If this doesn't work as described below, I might spend time<br>
>>>>>>>> trying to get it<br>
>>>>>>>> to run with clang 11 ;)<br>
>>>>>>>><br>
>>>>>>>> On 12/22/20 1:57 PM, Керим Хемраев via cfe-dev wrote:<br>
>>>>>>>>> Hi,<br>
>>>>>>>>><br>
>>>>>>>>> I’m struggling with compiling simple OpenMP program with clang 5.0.0.<br>
>>>>>>>>> Here is the code (foo.cxx):<br>
>>>>>>>>><br>
>>>>>>>>> #include "omp.h"<br>
>>>>>>>>> #include <stdio.h><br>
>>>>>>>>> int main ( void ) {<br>
>>>>>>>>> #pragma omp parallel<br>
>>>>>>>>> printf ( "thread %d \n " , omp_get_thread_num ());<br>
>>>>>>>>> }<br>
>>>>>>>>><br>
>>>>>>>>> As I use clang as part of xeus-cling my clang installation is inside conda packages:<br>
>>>>>>>>> $ which clang<br>
>>>>>>>>> /home/tasik/miniconda3/envs/cling/bin/clang<br>
>>>>>>>>><br>
>>>>>>>>> As this clang package does’t have omp.h I provide additional directories to find omp.h and libomp.so<br>
>>>>>>>>> To compile the code I use the command:<br>
>>>>>>>>> $ clang -fopenmp -I/home/../usr/lib/llvm-10/include/openmp/ -L/home/../usr/lib/llvm-10/lib foo.cxx<br>
>>>>>>>>><br>
>>>>>>>>> And I get errors:<br>
>>>>>>>>> /usr/bin/ld: cannot find /lib64/libpthread.so.0<br>
>>>>>>>>> /usr/bin/ld: cannot find /usr/lib64/libpthread_nonshared.a<br>
>>>>>>>>> clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)<br>
>>>>>>>> The error basically means clang looks for the libthread libraries and<br>
>>>>>>>> cannot find them.<br>
>>>>>>>> Check on you system where they are and provide the path via -L to clang.<br>
>>>>>>>> That might allow<br>
>>>>>>>> you to proceed. That said, I don't think you are able to mix clang 5 and<br>
>>>>>>>> llvm 10 as you<br>
>>>>>>>> do now. The headers and libraries clang might pick up need to be<br>
>>>>>>>> consistent (with the clang<br>
>>>>>>>> version). At least, you need to make sure `omp.h` and `libomp.so` are<br>
>>>>>>>> the ones shipped with<br>
>>>>>>>> clang 5.<br>
>>>>>>>><br>
>>>>>>>> ~ Johannes<br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>>> I really need some help to undertand how to work with clang 5.0.0 OpenMP<br>
>>>>>>>>> And I think that it is difficult to update clang’s version as xeus-cling requires mentioned 5.0.0 version...<br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>> With respect,<br>
>>>>>>>>> kerim<br>
>>>>>>>>><br>
>>>>>>>>> _______________________________________________<br>
>>>>>>>>> cfe-dev mailing list<br>
>>>>>>>>> <a href="/compose?To=cfe%2ddev@lists.llvm.org">cfe-dev@lists.llvm.org</a><br>
>>>>>>>>> <a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev" target="_blank">
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev</a><br>
>>>>>>> С уважением,<br>
>>>>>>> Керим Хемраев<br>
>>>>>>> <a href="/compose?To=kerim.khemraev@mail.ru">kerim.khemraev@mail.ru</a><br>
>>>>>>><br>
>>>>> С уважением,<br>
>>>>> Керим Хемраев<br>
>>>>> <a href="/compose?To=kerim.khemraev@mail.ru">kerim.khemraev@mail.ru</a><br>
>>>>><br>
>>><br>
>>> С уважением,<br>
>>> Керим Хемраев<br>
>>> <a href="/compose?To=kerim.khemraev@mail.ru">kerim.khemraev@mail.ru</a><br>
>>><br>
><br>
><br>
> С уважением,<br>
> Керим Хемраев<br>
> <a href="/compose?To=kerim.khemraev@mail.ru">kerim.khemraev@mail.ru</a><br>
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<div>С уважением,<br>
Керим Хемраев<br>
kerim.khemraev@mail.ru</div>
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