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Stefan Liebler 022dfdce00 Add configure check to test if gcc supports attribute ifunc. 
This patch adds a configure check to test if gcc supports attribute ifunc.
The support can either be enabled in <gcc-src>/gcc/config.gcc for one
architecture in general by setting default_gnu_indirect_function variable to yes
or by configuring gcc with --enable-gnu-indirect-function.

The next patch rewrites libc_ifunc macro to use gcc attribute ifunc instead
of inline assembly to generate the IFUNC symbols due to false debuginfo.

If gcc does not support attribute ifunc, the old approach for generating
ifunc'ed symbols is used. Then the debug-information is false. Thus it is
recommended to use a gcc with indirect function support (See notes in INSTALL).
After this patch-series these inline assemblies for ifunc-handling are not
scattered in multiple files but are used only indirect via ifunc-macros
and can simply removed in libc-symbols.h in future.

If glibc is configured with --enable-multi-arch and gcc does not support
attribute ifunc, a configure warning is dumped!

ChangeLog:

	* config.h.in (HAVE_GCC_IFUNC): New undef.
	* configure.ac: Add check if gcc supports attribute ifunc feature.
	* configure: Regenerated.
	* manual/install.texi: Add recommendation for gcc with
	indirect-function support.
	* INSTALL: Regenerated.
 		2016-10-07 10:02:59 +02:00
..
examples libio: Multiple fixes for open_{w}memstram (BZ#18241 and BZ#20181) 2016-09-30 09:14:15 -07:00
Makefile Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
argp.texi Manual typos: The Basic Program/System Interface 2016-10-06 12:19:25 +05:30
arith.texi Add iseqsig. 2016-10-06 22:19:38 +00:00
charset.texi manual: fix typos in character set handling 2016-06-16 00:45:37 -04:00
check-safety.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
conf.texi Manual typos: System Configuration Parameters 2016-10-06 12:24:07 +05:30
contrib.texi Manual typos: Contributors to 2016-10-06 12:30:03 +05:30
creature.texi Support __STDC_WANT_IEC_60559_FUNCS_EXT__ feature test macro. 2016-08-03 22:21:37 +00:00
crypt.texi Manual typos: DES Encryption and Password Handling 2016-10-06 12:25:00 +05:30
ctype.texi manual: fix typos in the character handling chapter 2016-06-16 00:37:44 -04:00
debug.texi Manual typos: Debugging support 2016-10-06 12:25:38 +05:30
dir .. 2005-11-21 15:45:19 +00:00
errno.texi manual: fix typos in error reporting 2016-05-19 23:25:06 -04:00
fdl-1.3.texi BZ#13738: Switch manual to FDL 1.3. 2012-02-24 12:58:10 -08:00
filesys.texi Manual typos: File System Interface 2016-10-06 12:01:51 +05:30
freemanuals.texi Update to canonical freemanuals.texi file. 2013-09-24 14:06:56 -07:00
getopt.texi Manual typos: The Basic Program/System Interface 2016-10-06 12:19:25 +05:30
header.texi Use Texinfo macros to refer to the GNU C Library within the manual. 2012-02-28 14:44:20 +00:00
install-plain.texi BZ #15941: Fix INSTALL file regeneration failure with makeinfo 5.x 2013-12-05 09:58:20 +05:30
install.texi Add configure check to test if gcc supports attribute ifunc. 2016-10-07 10:02:59 +02:00
intro.texi manual: fix typo in the introduction 2016-05-19 23:22:59 -04:00
io.texi Clean up glibc manual references to "GNU system" (bug 6911). 2012-03-08 01:27:38 +00:00
ipc.texi manual/ipc.texi: Fix AC-safety notes. 2014-04-08 17:12:15 -04:00
job.texi Manual typos: Job Control 2016-10-06 12:20:28 +05:30
lang.texi Manual typos: C Language Facilities in the Library 2016-10-06 12:27:48 +05:30
lgpl-2.1.texi Use canonical FSF .texi files for LGPL and FDL texts. 2011-06-06 16:16:55 -07:00
libc-texinfo.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
libc.texinfo Fix doc quoting problems with Texinfo 5 2016-01-10 00:20:51 -08:00
libcbook.texi initial import 1995-02-18 01:27:10 +00:00
libdl.texi * manual/libdl.texi: New. 2014-01-31 23:23:59 -02:00
libm-err-tab.pl Add iseqsig. 2016-10-06 22:19:38 +00:00
llio.texi Manual typos: Low-Level Input/Output 2016-10-06 11:58:02 +05:30
locale.texi manual: fix spelling typos 2016-06-16 00:59:57 -04:00
macros.texi Fix exponents in manual. 2015-08-20 09:43:50 +02:00
maint.texi Manual typos: Library Maintenance 2016-10-06 12:29:11 +05:30
math.texi Manual typos: Mathematics 2016-10-06 12:11:08 +05:30
memory.texi manual: fix typos in the memory chapter 2016-06-16 00:33:53 -04:00
message.texi manual: fix typos in the message chapter 2016-06-16 01:14:32 -04:00
nss.texi Manual typos: System Databases and Name Service Switch 2016-10-06 12:36:26 +05:30
nsswitch.texi update from main archive 960814 1996-08-15 01:23:29 +00:00
pattern.texi manual: fix typos in the pattern chapter 2016-06-16 01:34:38 -04:00
pipe.texi * manual/pipe.texi: Document MTASC-safety properties. 2014-01-31 23:37:28 -02:00
platform.texi PowerPC: Extend Program Priority Register support 2015-08-19 17:43:26 -03:00
probes.texi Manual typos: Internal probes 2016-10-06 12:26:35 +05:30
process.texi Manual typos: Processes 2016-10-06 12:20:00 +05:30
resource.texi Manual typos: Resource Usage and Limitation 2016-10-06 12:16:53 +05:30
search.texi manual: fix typos in the search chapter 2016-06-16 01:24:16 -04:00
setjmp.texi Manual typos: Non-Local Exits 2016-10-06 12:17:29 +05:30
signal.texi Manual typos: Signal Handling 2016-10-06 12:18:05 +05:30
socket.texi Manual typos: Sockets 2016-10-06 12:05:11 +05:30
startup.texi Manual typos: The Basic Program/System Interface 2016-10-06 12:19:25 +05:30
stdio-fp.c update from main archive 970225 1997-02-25 05:18:05 +00:00
stdio.texi Manual typos: Input/Output on Streams 2016-10-06 11:55:58 +05:30
string.texi manual: Clarify the documentation of strverscmp [BZ #20524] 2016-09-21 15:41:17 +02:00
summary.awk Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysinfo.texi Manual typos: System Management 2016-10-06 12:23:27 +05:30
syslog.texi Manual typos: Syslog 2016-10-06 12:08:46 +05:30
terminal.texi Manual typos: Low-Level Terminal Interface 2016-10-06 12:07:28 +05:30
texinfo.tex Update miscellaneous files from upstream sources. 2016-01-05 18:04:06 +00:00
texis.awk Correct close statement. 2001-05-18 13:01:32 +00:00
threads.texi Manual typos: POSIX Threads 2016-10-06 12:26:06 +05:30
time.texi Manual typos: Date and Time 2016-10-06 12:14:36 +05:30
tsort.awk Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
users.texi Manual typos: Users and Groups 2016-10-06 12:21:46 +05:30
xtract-typefun.awk Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00