Remove _BSD_SOURCE and _SVID_SOURCE.

This is a minimal patch to remove _BSD_SOURCE and _SVID_SOURCE from
the documented user API, making them into aliases for _DEFAULT_SOURCE
with a #warning given, but keeping most of the features.h logic using
those macros and all the exising __USE_* conditionals, on the basis
that all the consequent cleanups will go in followup patches.

Tested x86_64.

	* include/features.h: Update comment documenting feature test
	macros.
	[_BSD_SOURCE || _SVID_SOURCE]: Give #warning.  Define
	_DEFAULT_SOURCE.
	* manual/creature.texi (_BSD_SOURCE): Remove documentation.
	(_SVID_SOURCE): Likewise.
	(_DEFAULT_SOURCE): Update description of default features.
	(Feature Test Macros): Don't mention _SVID_SOURCE in conjunction
	with _GNU_SOURCE.
	* manual/filesys.texi (__ftw_func_t): Do not refer to _BSD_SOURCE.
	(S_ISVTX): Likewise.
	* manual/math.texi (Mathematical Constants): Likewise.
	* manual/signal.texi (Interrupted Primitives): Likewise.
	* manual/startup.texi (putenv): Do not refer to _SVID_SOURCE.
	* math/test-matherr.c (_SVID_SOURCE): Do not define.
	* sysvipc/sys/ipc.h [__USE_SVID && !__USE_XOPEN && __GNUC__ >= 2]:
	Don't refer to _SVID_SOURCE in warning text.

1 files changed, 1 insertions, 8 deletions

diff --git a/manual/signal.texi b/manual/signal.texi
index f0e57ddbe4..51f68b5d3e 100644
--- a/manual/signal.texi
+++ b/manual/signal.texi
@@ -2141,16 +2141,9 @@ that handler will cause @code{EINTR}.  @xref{Flags for Sigaction}.
 Another way to specify the choice is with the @code{siginterrupt}
 function.  @xref{BSD Handler}.
 
-@c !!! not true now about _BSD_SOURCE
 When you don't specify with @code{sigaction} or @code{siginterrupt} what
 a particular handler should do, it uses a default choice.  The default
-choice in @theglibc{} depends on the feature test macros you have
-defined.  If you define @code{_BSD_SOURCE} or @code{_GNU_SOURCE} before
-calling @code{signal}, the default is to resume primitives; otherwise,
-the default is to make them fail with @code{EINTR}.  (The library
-contains alternate versions of the @code{signal} function, and the
-feature test macros determine which one you really call.)  @xref{Feature
-Test Macros}.
+choice in @theglibc{} is to make primitives fail with @code{EINTR}.
 @cindex EINTR, and restarting interrupted primitives
 @cindex restarting interrupted primitives
 @cindex interrupting primitives