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[sanitizer] Refactor GNU libc version retrieval
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Authored by Lekensteyn on Jun 16 2018, 3:12 AM.

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Summary

Use gnu_get_libc_version (since GNU libc 2.1) instead of confstr because
the latter is intercepted by msan and therefore less suitable for reuse.

No functional change intended.

In D48254#1134845, @Lekensteyn wrote:

Superseded by https://reviews.llvm.org/D48265

Sorry, I have not noticed your patches.

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lib/

sanitizer_common/

84 lines