[PATCH] D20903: Make system_error::message() thread safe. Fixes PR25598.

[Eric Fiselier via cfe-commits]

EricWF updated this revision to Diff 60642.
EricWF added a comment.

- Use a local buffer instead of a `static` `thread_local` one.
- Save and restore errno in the POSIX implementation.


http://reviews.llvm.org/D20903

Files:
  src/system_error.cpp
  test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp
  test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp

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