From 16396c41deab45f715ffd813280d9d685b3b281e Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Thu, 18 Feb 2016 11:00:33 -0200 Subject: Add _STRING_INLINE_unaligned and string_private.h As discussed in https://sourceware.org/ml/libc-alpha/2015-10/msg00403.html the setting of _STRING_ARCH_unaligned currently controls the external GLIBC ABI as well as selecting the use of unaligned accesses withing GLIBC. Since _STRING_ARCH_unaligned was recently changed for AArch64, this would potentially break the ABI in GLIBC 2.23, so split the uses and add _STRING_INLINE_unaligned to select the string ABI. This setting must be fixed for each target, while _STRING_ARCH_unaligned may be changed from release to release. _STRING_ARCH_unaligned is used unconditionally in glibc. But , which defines _STRING_ARCH_unaligned, isn't included with -Os. Since _STRING_ARCH_unaligned is internal to glibc and may change between glibc releases, it should be made private to glibc. _STRING_ARCH_unaligned should defined in the new string_private.h heade file which is included unconditionally from internal for glibc build. [BZ #19462] * bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * include/string.h: Include . * string/bits/string2.h: Replace _STRING_ARCH_unaligned with _STRING_INLINE_unaligned. * sysdeps/aarch64/bits/string.h (_STRING_ARCH_unaligned): Removed. (_STRING_INLINE_unaligned): New. * sysdeps/aarch64/string_private.h: New file. * sysdeps/generic/string_private.h: Likewise. * sysdeps/m68k/m680x0/m68020/string_private.h: Likewise. * sysdeps/s390/string_private.h: Likewise. * sysdeps/x86/string_private.h: Likewise. * sysdeps/m68k/m680x0/m68020/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * sysdeps/s390/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * sysdeps/sparc/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * sysdeps/x86/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. --- bits/string.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'bits/string.h') diff --git a/bits/string.h b/bits/string.h index b88a6bc601..89c627c182 100644 --- a/bits/string.h +++ b/bits/string.h @@ -8,7 +8,11 @@ #ifndef _BITS_STRING_H #define _BITS_STRING_H 1 -/* Define if architecture can access unaligned multi-byte variables. */ -#define _STRING_ARCH_unaligned 0 +/* Define whether to use the unaligned string inline ABI. + The string inline functions are an external ABI, thus cannot be changed + after the first release of a new target (unlike _STRING_ARCH_unaligned + which may be changed from release to release). Targets must support + unaligned accesses in hardware if either define is set to true. */ +#define _STRING_INLINE_unaligned 0 #endif /* bits/string.h */ -- cgit v1.2.3