[cfe-dev] Can't compile simple OpenMP code with clang 5.0.0

Керим Хемраев via cfe-dev cfe-dev at lists.llvm.org
Tue Dec 22 13:08:53 PST 2020

How can check if OpenMP is enabled in my clang package?

>Вторник, 22 декабря 2020, 23:57 +03:00 от Marcus Johnson <marcusljohnson1991 at gmail.com>:
>Another thing:
>Clang can be compiled without OpenMP support, which removes the omp.h header, libomp.dylib, and tablegen isn’t even run for OpenMP pragmas.
>Your Clang distribution needs to be compiled with OpenMP support for it to work at all.
>>On Dec 22, 2020, at 12:55 PM, Marcus Johnson < MarcusLJohnson1991 at gmail.com > wrote:
>>Why are you using such an old version of Clang?
>>Clang the compiler needs to be built with support for parsing OpenMP pragmas.
>>It’s not just the header and runtime you need to successfully compile with OpenMP
>>>On Dec 22, 2020, at 11:57 AM, Керим Хемраев via cfe-dev < cfe-dev at lists.llvm.org > wrote:
>>>I’m struggling with compiling simple OpenMP program with clang 5.0.0.
>>>Here is the code (foo.cxx):
>>>#include   "omp.h"
>>>#include   <stdio.h>  
>>>int   main ( void ) {
>>>   #pragma   omp   parallel
>>>   printf ( "thread %d \n " ,  omp_get_thread_num ());
>>>As I use clang as part of xeus-cling my clang installation is inside conda packages: 
>>>$  which clang
>>>As this clang package does’t have  omp.h I provide additional directories to find  omp.h  and  libomp.so
>>>To compile the code I use the command:
>>>$ clang -fopenmp -I/home/../usr/lib/llvm-10/include/openmp/ -L/home/../usr/lib/llvm-10/lib foo.cxx
>>>And I get errors:
>>>/usr/bin/ld: cannot find /lib64/libpthread.so.0
>>>/usr/bin/ld: cannot find /usr/lib64/libpthread_nonshared.a
>>>clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)
>>>I really need some help to undertand how to work with clang 5.0.0 OpenMP
>>>And I think that it is difficult to update clang’s version as xeus-cling requires mentioned 5.0.0 version...
>>>With respect,
>>>kerim _______________________________________________
>>>cfe-dev mailing list
>>>cfe-dev at lists.llvm.org
С уважением,
Керим Хемраев
kerim.khemraev at mail.ru
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