Statically linking libgomp

[Rodrigo Queiro]

Hey bazel-discuss@,

I'm building something depends on libgomp as it compiles with -fopenmp. I'd like to statically link this in to make the binary more portable. I don't want to build a fully-static library, as this breaks getaddrinfo().

This can be done with gcc using -static-libstdc++ or -Wl,-Bstatic -lgomp -Wl,-Bdynamic. -static-libstdc++ doesn't work with Bazel because of #2840. The latter doesn't work, as the "-lgomp" is removed and put in the params file.

I could check in libgomp.a into the repo, or work out where to load it from the local system, but those both seem messy.

Can anyone suggest what the best way to do this would be?

Thanks,

Rodrigo

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[musiccom...@gmail.com]

On Wednesday, October 18, 2017 at 3:52:06 AM UTC-7, Rodrigo Queiro wrote:
> Hey bazel-discuss@,
>
>
> I'm building something depends on libgomp as it compiles with -fopenmp. I'd like to statically link this in to make the binary more portable. I don't want to build a fully-static library, as this breaks getaddrinfo().
>
>
> This can be done with gcc using -static-libstdc++ or -Wl,-Bstatic -lgomp -Wl,-Bdynamic. -static-libstdc++ doesn't work with Bazel because of #2840. The latter doesn't work, as the "-lgomp" is removed and put in the params file.
>
>
> I could check in libgomp.a into the repo, or work out where to load it from the local system, but those both seem messy.
>
>
> Can anyone suggest what the best way to do this would be?

A somewhat-hacky way to accomplish this is to use syntax like -l:libgomp.a to force the linker to search for only the static library.

[rodr...@google.com]

On Thursday, October 26, 2017 at 6:53:31 PM UTC+2, musiccom...@gmail.com wrote:
> A somewhat-hacky way to accomplish this is to use syntax like -l:libgomp.a to force the linker to search for only the static library.

Thanks for the suggestion. In the end, I added it to the container, which seemed more in the spirit of "mostly-static".

https://github.com/GoogleCloudPlatform/distroless/commit/5366dba4c963356e21a3f23144a3b3307287bc54