strip: File format not recognized

[Mathnerd314]

While building many programs, the strip command in fixupPhase emits the "File format not recognized" message many times. It would be nice if these messages were suppressed, as they do not mean anything.

Steps to reproduce

See http://hydra.nixos.org/build/34720826 for an example (nix-build '' -A SDL_stretch); there are many others.

[vcunat]

Closely related to #5447. The current strategy is to run strip on every file from a directory list and ignore the errors. Perhaps we should use stdenv's isELF function, though that still shouldn't detect *.a and maybe other strippable stuff.

[bjornfor]

Ref #15339.

[Profpatsch]

I think I have seen that this has been fixed somewhere, but I could be mistaken.

[stale]

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