Remove bits/string.h.

These machine-dependent inline string functions have never been on by
default, and even if they were a good idea at the time they were
introduced, they haven't really been touched in ten to fifteen years
and probably aren't a good idea on current-gen processors.  Current
thinking is that this class of optimization is best left to the
compiler.

	* bits/string.h, string/bits/string.h
	* sysdeps/aarch64/bits/string.h
	* sysdeps/m68k/m680x0/m68020/bits/string.h
	* sysdeps/s390/bits/string.h, sysdeps/sparc/bits/string.h
	* sysdeps/x86/bits/string.h: Delete file.

	* string/string.h: Don't include bits/string.h.
	* string/bits/string3.h: Rename to bits/string_fortified.h.
	No need to undef various symbols that the removed headers
	might have defined as macros.
	* string/Makefile (headers): Remove bits/string.h, change
	bits/string3.h to bits/string_fortified.h.
	* string/string-inlines.c: Update commentary.  Remove definitions
	of various macros that nothing looks at anymore.  Don't directly
	include bits/string.h. Set _STRING_INLINE_unaligned here, based on
	compiler-predefined macros.
	* string/strncat.c: If STRNCAT is not defined, or STRNCAT_PRIMARY
	_is_ defined, provide internal hidden alias __strncat.
	* include/string.h: Declare internal hidden alias __strncat.
	Only forward __stpcpy to __builtin_stpcpy if __NO_STRING_INLINES is
	not defined.
	* include/bits/string3.h: Rename to bits/string_fortified.h,
	update to match above.

	* sysdeps/i386/string-inlines.c: Define compat symbols for
	everything formerly defined by sysdeps/x86/bits/string.h.
	Make existing definitions into compat symbols as well.
	Remove some no-longer-necessary messing around with macros.

	* sysdeps/powerpc/powerpc32/power4/multiarch/mempcpy.c
	* sysdeps/powerpc/powerpc64/multiarch/mempcpy.c
	* sysdeps/powerpc/powerpc64/multiarch/stpcpy.c
	* sysdeps/s390/multiarch/mempcpy.c
	No need to define _HAVE_STRING_ARCH_mempcpy.
	Do define __NO_STRING_INLINES and NO_MEMPCPY_STPCPY_REDIRECT.

	* sysdeps/i386/i686/multiarch/strncat-c.c
	* sysdeps/s390/multiarch/strncat-c.c
	* sysdeps/x86_64/multiarch/strncat-c.c
	Define STRNCAT_PRIMARY.  Don't change definition of libc_hidden_def.

1 files changed, 1 insertions, 21 deletions

diff --git a/string/string.h b/string/string.h
index d1a274628f..3b68579c2e 100644
--- a/string/string.h
+++ b/string/string.h
@@ -487,30 +487,10 @@ extern char *basename (const char *__filename) __THROW __nonnull ((1));
 # endif
 #endif
 
-
 #if __GNUC_PREREQ (3,4)
-# if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
-     && !defined __NO_INLINE__ && !defined __cplusplus
-/* When using GNU CC we provide some optimized versions of selected
-   functions from this header.  There are two kinds of optimizations:
-
-   - machine-dependent optimizations, most probably using inline
-     assembler code; these might be quite expensive since the code
-     size can increase significantly.
-     These optimizations are not used unless the symbol
-	__USE_STRING_INLINES
-     is defined before including this header.
-
-   One can inhibit all optimizations by defining __NO_STRING_INLINES.  */
-
-/* Get the machine-dependent optimizations (if any).  */
-#  include <bits/string.h>
-
-# endif
-
 # if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 /* Functions with security checks.  */
-#  include <bits/string3.h>
+#  include <bits/string_fortified.h>
 # endif
 #endif