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feature test macros: make _GNU_SOURCE enable everything

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previously, a few BSD features were enabled only by _BSD_SOURCE, not
by _GNU_SOURCE. since _BSD_SOURCE is default in the absence of other
feature test macros, this made adding _GNU_SOURCE to a project not a
purely additive feature test macro; it actually caused some features
to be suppressed.

most of the changes made by this patch actually bring musl in closer
alignment with the glibc behavior for _GNU_SOURCE. the only exceptions
are the added visibility of functions like strlcpy which were BSD-only
due to being disliked/rejected by glibc maintainers. here, I feel the
consistency of having _GNU_SOURCE mean "everything", and especially
the property of it being purely additive, are more valuable than
hiding functions which glibc does not have.
This commit is contained in:
Rich Felker 2012-12-03 16:57:01 -05:00
commit 769fd4ce20
5 changed files with 4 additions and 18 deletions
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include/signal.h
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@ -212,7 +212,7 @@ void (*sigset(int, void (*)(int)))(int);
#define NSIG _NSIG
#endif
#ifdef _BSD_SOURCE
#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
typedef void (*sig_t)(int);
#endif