Bug#811283: libomp5: missing SONAME link /usr/lib/libomp.so -> libomp.so.5

[Roman Lebedev]

On Sun, Jan 17, 2016 at 7:42 PM, Julien Cristau <jcristau at debian.org> wrote:
> Control: tag -1 moreinfo
> Control: severity -1 normal
>
> On Sun, Jan 17, 2016 at 19:30:36 +0300, Roman Lebedev wrote:
>
>> Package: libomp5
>> Version: 3.7.0-3
>> Severity: serious
>>
>> Dear Maintainer,
>>
>> This is almost exact copy of Debian Bug #775257 titled:
>> libiomp5: missing SONAME link /usr/lib/libiomp5.so -> libiomp5.so.5
>>
>> libomp5 misses the SONAME link, which breaks all clang openmp support.
>>
>> You can test it by:
>>
>> $ cat test.c
>> #include <omp.h>
>> int main() {
>> #ifdef _OPENMP
>> return 0;
>> #else
>> breaks_on_purpose
>> #endif
>>
>> $ clang-3.7 -fopenmp=libomp test.c
>> /usr/bin/ld: error: cannot find -lomp
>> clang: error: linker command failed with exit code 1 (use -v to see
>> invocation)
>>
>> As i'm being told, libomp-dev install those symlinks.
>> Indeed, if i install libomp-dev, clang openmp works.
>>
>> But then why:
>> 0. symlinks are installed by libomp-dev and not libomp5?
>
> Because that's what libomp-dev is for.  libomp5 must not install
> libomp.so.
>
>> 1. clang doesn't pull libomp-dev, since it does not work without those symlinks?
(that should have read: but then why clang doesn't pull libomp-dev,
since it's OpenMP does not work without those symlinks?)
Also, Bug#811287 and Bug#811288 have been filled against clang
packages requesting for them
to pull libomp5 AND/OR libomp-dev packages.

>>
> I'm pretty sure clang works without it, if you don't use -fopenmp.
Yes.
This is issue is strictly for OpenMP support in newest clang versions - 3.7+

>
> Cheers,
> Julien
Roman.