[PATCH] LTO: display file name if LTO version check fails

[Martin Liška]

Hi.

During the compilation of chrome, I've noticed that they utilize 'cc' binary.
Because of that, I see LTO version check, but it would be quite useful to
see which file is affected.

Like:

lto1: fatal error: bytecode stream in file 'obj/third_party/icu/source/common/icuuc.cmemory.o' generated with LTO version 4.0 instead of the expected 6.0

Ready after it finishes regression tests?
Thanks,
Martin

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