[Openmp-dev] Pass arch-specific OpenMP library name to the linker

[C Bergström via Openmp-dev]

I'm a bit more biased towards not mixing different arch in the same
directory. The Solaris/Linux? solution of 1 arch per directory means
that the only thing needed is just looking in ${arch}/lib or something
along those lines. If using this as a solution then everything arch
specific can live there.. (Would this overlap and help sanitizer as
well?)

Long term driver special rules are a pita to maintain and unlikely to
lead to good design..

On Sat, Dec 10, 2016 at 7:09 AM, Pirama Arumuga Nainar via Openmp-dev
<openmp-dev at lists.llvm.org> wrote:
> Reposting PR https://llvm.org/bugs/show_bug.cgi?id=31300 to reach a wider
> audience.  Can you please share any thoughts?
>
> Currently, '-fopenmp' just gets translated to the corresponding runtime
> library (-lomp, -lgomp, -lipmp5) during the link step.  However, this
> precludes a multilib toolchain from finding the right library based on the
> target architecture without extra support from the build system.  The
> sanitizers, for instance, use libclang_rt.<sanitizer>-<arch>.{so,a}.
>
> To do something similar for OpenMP, we need to
> 1. change the driver to pass the extended name to the linker.
> 2. change the CMake build rules to use the extended name instead of
> libomp.so.
>
> My questions:
> 1. What is the preferred "full" name?  libomp-<arch>.so sounds reasonable to
> me.
> 2. Is the existing behavior preferable to avoid breaking existing code or to
> support OpenMP runtimes from outside of this project?  If so, I can make the
> above changes fire only for Android triples.  In this case, we don't need to
> immediately update CMake build rules.
>
>
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