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Dan Winship authored
Add a check to configure.ac for strerror_r, since we don't currently require POSIX.1-2001 conformance in general. Add back a plain-strerror() case as a fallback, and rearrange the glibc-vs-POSIX strerror_r() branches. Update the docs to not claim that "not all platforms support the strerror() function" (we require C90), but still mention the UTF-8 and always-valid-string benefits. (And make test_strerror() check that last part.) https://bugzilla.gnome.org/show_bug.cgi?id=754788
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