Commit Graph

632 Commits

Author SHA1 Message Date
Joseph Myers
a9224562cb Remove init_array / fini_array configure test.
There is a configure test "for .preinit_array/.init_array/.fini_array
support".  Support for this feature was added in binutils 2.13, so the
configure test is obsolete; this patch removes it.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_initfini_array): Remove configure test.
	* configure: Regenerated.
2015-11-02 15:08:25 +00:00
Joseph Myers
2a723ff6ff Remove configure tests for visibility support.
There are various configure tests for visibility support in the
compiler and assember.

GCC support for visibility attributes was added in GCC 3.3.  I don't
know what specific fix was intended by the test "for broken
__attribute__((visibility())", but it was added by
<https://sourceware.org/ml/libc-hacker/2002-08/msg00030.html>, and GCC
3.3 appears not to have that breakage, so I suspect it was only ever
in development versions before 3.3 was released.  The assembler
support was added in binutils 2.10.

This patch removes the tests in question as obsolete.  Two tests that
were formerly conditional on "if test $libc_cv_visibility_attribute =
yes", including the one for linker support for protected data, are now
unconditional.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_asm_protected_directive): Remove configure
	test.
	(libc_cv_visibility_attribute): Likewise.
	(libc_cv_protected_data): Test unconditionally.
	(libc_cv_broken_visibility_attribute): Remove configure test.
	(libc_cv_have_sdata_section): Test unconditionally.
	* configure: Regenerated.
2015-10-29 12:48:24 +00:00
Joseph Myers
783dd2d3af Use -std=gnu11 instead of -std=gnu99.
Now that GCC 4.7 or later is required to build glibc, this patch moves
the build from using -std=gnu99 to -std=gnu11 (option added in 4.7).
This allows use of C11 features from GCC's headers, such as new
float.h macros and max_align_t.

Tested for x86_64 and x86 (testsuite; installed stripped shared
libraries are unchanged by the patch on x86_64, while I see some
slight code reordering of no significance on x86).

	* Makeconfig (CFLAGS): Use -std=gnu11 instead of -std=gnu99.
	* Makefile ($(objpfx)c++-types-check.out): Filter out -std=gnu11
	instead of -std=gnu99.
	* configure.ac (systemtap): Test with -std=gnu11 instead of
	-std=gnu99.
	* configure: Regenerated.
	* math/gen-auto-libm-tests.c: Use -std=gnu11 instead of -std=gnu99
	in compilation command in comment.
2015-10-27 21:47:22 +00:00
Joseph Myers
3e2ee6f0e3 Remove sysdeps/nptl/configure.ac.
sysdeps/nptl/configure.ac tests for forced unwind support and the C
cleanup attribute, giving errors if either is unsupported.  It does
nothing beyond running those two tests.

Both the attribute, and _Unwind_GetCFA which is used in the forced
unwind test, were added in GCC 3.3.  Thus these tests are long
obsolete, and this patch removes the configure fragment running them,
along with associated conditionals.

Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by the patch).

	* sysdeps/nptl/configure.ac: Remove file.
	* sysdeps/nptl/configure: Remove generated file.
	* configure.ac (libc_cv_forced_unwind): Do not substitute.
	* configure: Regenerated.
	* config.h.in (HAVE_FORCED_UNWIND): Remove #undef.
	* config.make.in (have-forced-unwind): Remove variable.
	* nptl/Makefile [$(have-forced-unwind) = yes]: Make code
	unconditional.
	* nptl/descr.h [HAVE_FORCED_UNWIND]: Likewise.
	* nptl/unwind.c [HAVE_FORCED_UNWIND]: Likewise.
	(__pthread_unwind) [!HAVE_FORCED_UNWIND]: Remove conditional code.
	* nptl/version.c [HAVE_FORCED_UNWIND]: Make code unconditional.
	* sysdeps/nptl/Makefile [$(have-forced-unwind) = yes]: Make code
	unconditional.
2015-10-27 21:46:03 +00:00
Joseph Myers
b08b421835 Require GCC 4.7 or later to build glibc.
This patch implements a requirement of GCC 4.7 or later to build
glibc.

This was discussed in the thread starting at
<https://sourceware.org/ml/libc-alpha/2015-08/msg00851.html>.
Concerns were expressed by Mike and David.  At
<https://sourceware.org/ml/libc-alpha/2015-10/msg00453.html> I have
provided a 14-patch series showing in outline the cleanups facilitated
by this version requirement, as requested by Mike (this patch is the
first in that series, with the addition of a NEWS entry).  Given the
absence of further concerns or alternative proposals for criteria for
updates to this version requirement as requested in
<https://sourceware.org/ml/libc-alpha/2015-10/msg00065.html>, I am
interpreting this as "absence of sustained opposition" under Carlos's
definition at <https://sourceware.org/glibc/wiki/Consensus> and
proposing this patch for inclusion in glibc.  I'd like to remind
people testing with 4.6 that if they move to testing with GCC 5 then
it will probably be about four years before they need to update the
compiler they use to test glibc again.

Although on the principles of time-based updates I think a move to
requiring binutils 2.23 would be reasonable, I'm not currently aware
of any cleanups that would facilitate so am not proposing that at this
time (but would expect to propose a move to requiring binutils 2.24 in
a year's time, as that brings features such as AVX512 support that
should allow some conditionals to be cleaned up).  If someone thinks a
move to requiring 2.23 would help clean things up for their
architecture, please speak up.  (And in general, I suspect there are
lots of architecture-specific configure tests that could be removed on
the basis of current GCC and binutils version requirements, given how
I've found architecture-independent tests obsolete on the basis of
version requirements going back 20 years.)

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_compiler_ok): Require GCC 4.7 or later.
	* configure: Regenerated.
	* manual/install.texi (Tools for Compilation): Document
	requirement for GCC 4.7 or later.
	* INSTALL: Regenerated.
2015-10-27 16:34:12 +00:00
Joseph Myers
7a4cb4ad11 Remove TLS configure tests.
There seemed to be support in response to
<https://sourceware.org/ml/libc-alpha/2015-10/msg00510.html> for
removing configure tests that exist only to produce errors, where we
expect that tool versions failing the tests would also fail the tests
of minimum GCC / binutils versions.

This patch removes the tests for TLS support as one instance of such
tests.  Since the addition of TLS emulation support in GCC 4.3, I
don't think these tests would have failed even if proper TLS support
(as required by glibc) was missing in that architecture's GCC back
end, so any new glibc ports wanting a substantive test (if there are
actual GCC or binutils versions for those architectures, with
supported version numbers, missing TLS support) would have needed an
architecture-specific test anyway.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_gcc___thread): Remove configure test.
	(libc_cv_gcc_tls_model_attr): Likewise.
	* configure: Regenerated.
2015-10-27 10:48:05 +00:00
Joseph Myers
e4f5eae8f0 Remove configure test for needing -P for .S files.
There is a configure test for "whether we need to use -P to assemble
.S files".

I think this test is long obsolete.  I don't have a specific reference
to a binutils change or version that obsoleted this test, but: (a) we
only support GNU binutils; (b) it looks like every architecture
supported by glibc has '#' as a line comment character in its gas
port; (c) in any case, if the (compiler, assembler) combination in use
cannot compile a .S file without special options, that would clearly
be a substantially broken combination, which I don't think we need to
allow for at all.

The test in question was added by:

Thu Jan 27 16:46:03 1994  Roland McGrath  (roland@churchy.gnu.ai.mit.edu)

        * configure.in (asm-CPPFLAGS): Add new check to see if assembling
        a .S file loses without -P.  If so, set asm-CPPFLAGS=-P in config.make.

This patch removes the test and the reference to this issue in the
comment on the default empty definition of asm-CPPFLAGS.  (Various
other settings of asm-CPPFLAGS remain in sysdeps Makefile fragments.)

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_need_minus_P): Remove configure test.
	* configure: Regenerated.
	* Makeconfig (asm-CPPFLAGS): Remove reference to -P in comment.
2015-10-27 10:46:15 +00:00
Joseph Myers
f5659917f9 Remove support for removing glibc 2.0 headers.
There is a configure test for the presence of glibc 2.0 headers (that
were renamed / no longer installed in glibc 2.1) and associated
support for removing them on "make install".

Normal practice for subsequent removal / renaming of installed files
has been not to do anything special about removing them; if you want
installed files from an old installation removed reliably, you need to
use a packaging system that tracks what files were installed by a
previous glibc package (via installing in an intermediate directory
with install_root).  I think it's been long enough since 2.0 that it's
not particularly useful to have that special logic for those old
headers either; this patch removes it.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (old_glibc_headers): Remove configure test.
	* configure: Regenerated.
	* config.make.in (old-glibc-headers): Remove variable.
	* Makefile [!$(install_root) && $(old-glibc-headers) = yes]
	(install): Remove dependency on remove-old-headers.
	(headers2_0): Remove variable.
	(remove-old-headers): Remove rule.
2015-10-26 22:46:04 +00:00
Joseph Myers
8c0c01dbe7 Remove configure test for assembler .text directive.
There is a configure test for assembler support for the .text
directive.

I suppose this test must have been aimed at some non-ELF platform or
non-GNU assembler.  Certainly the GNU assembler has had ELF-specific
architecture-independent handling for .text since version 2.2, and
generic non-ELF-specific support predates that.

This patch removes this test as obsolete.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_dot_text): Remove configure test.
	(libc_cv_asm_set_directive): Use .text instead of
	${libc_cv_dot_text} in configure test.
	* configure: Regenerated.
2015-10-26 22:44:18 +00:00
Florian Weimer
d337ceb76d Use the CXX compiler only if it can create dynamic and static programs
* configure.ac (CXX): Clear the variable if the C++ toolchain does
	not support static linking.
	* configure: Regenerate.
2015-10-26 09:41:10 +01:00
Joseph Myers
864198ed30 Remove gnu_unique_object configure test.
There is a configure test for assembler support for the
gnu_unique_object symbol type.  This support was added in binutils
2.20, so is present in all versions supported for building glibc.

Thus, I think the configure test can be removed; this patch does so.
Now, there is a caveat that the gas NEWS entry refers to this as a
feature for GNU/Linux targets.  But the condition is use of
ELFOSABI_GNU or ELFOSABI_NONE.  ELFOSABI_GNU covers Hurd as well as
GNU/Linux (as was the case with the older ELFOSABI_LINUX name), and
ELFOSABI_NONE means this is effectively OS-independent.  Furthermore,
I think a correct binutils port for any glibc target ought to support
this feature for use with glibc; glibc supports this as an
OS-independent feature (the configure test is only about glibc
testcases).

Tested for x86_64 (testsuite, and that installed shared libraries are
unchanged by the patch).

	* configure.ac (libc_cv_asm_unique_object): Remove configure test.
	* configure: Regenerated.
	* config.h.in (HAVE_ASM_UNIQUE_OBJECT): Remove #undef.
	* elf/tst-unique1.c (do_test) [HAVE_ASM_UNIQUE_OBJECT]: Make code
	unconditional.
	* elf/tst-unique1mod1.c [HAVE_ASM_UNIQUE_OBJECT]: Likewise.
	* elf/tst-unique1mod2.c [HAVE_ASM_UNIQUE_OBJECT]: Likewise.
	* elf/tst-unique2.c (do_test) [HAVE_ASM_UNIQUE_OBJECT]: Likewise.
	(do_test) [!HAVE_ASM_UNIQUE_OBJECT]: Remove conditional code.
	* elf/tst-unique2mod1.c [HAVE_ASM_UNIQUE_OBJECT]: Make code
	unconditional.
	* elf/tst-unique2mod2.c [HAVE_ASM_UNIQUE_OBJECT]: Likewise.
2015-10-19 22:34:20 +00:00
Mike Frysinger
6ab674ebff use -fstack-protector-strong when available
With gcc-4.9, a new -fstack-protector-strong flag is available that is
between -fstack-protector (pretty weak) and -fstack-protector-all (pretty
strong) that provides good trade-offs between overhead but still providing
good coverage.  Update the places in glibc that use ssp to use this flag
when it's available.

This also kills off the indirection of hardcoding the flag name in the
Makefiles and adding it based on a have-ssp boolean.  Instead, the build
always expands the $(stack-protector) variable to the best ssp setting.
This makes the build logic a bit simpler and allows people to easily set
to a diff flag like:
	make stack-protector=-fstack-protector-all
2015-10-19 15:36:48 -04:00
Mike Frysinger
44f826e317 timezone: polish grammar a bit in documentation
Reported-by: ricaljasan@pacific.net
2015-10-19 14:12:03 -04:00
Joseph Myers
361468f226 Remove -fgnu89-inline configure test.
There is a configure test for -fgnu89-inline.  This option was added
in GCC 4.2, so the test is obsolete; this patch removes it.

Tested for x86_64 (testsuite, and that installed shared libraries are
unchanged by the patch).

	* configure.ac (libc_cv_gnu89_inline): Remove configure test.
	* configure: Regenerated.
	* config.make.in (gnu89-inline-CFLAGS): Remove variable.
	* Makeconfig (CFLAGS): Use -fgnu89-inline instead of
	$(gnu89-inline-CFLAGS).
2015-10-19 12:07:03 +00:00
Joseph Myers
210dd78238 Remove .weak, .weakext configure tests.
There are configure tests for assembler .weak support, and, as a
fallback, for .weakext support.

.weakext appears to be an ECOFF thing (although a few ELF targets
support it as well).  .weak has been supported by the GNU assembler
for ELF targets since version 2.2, so given the requirement for ELF
the configure tests are obsolete; this patch removes them.

Tested for x86_64 (testsuite, and that installed shared libraries are
unchanged by the patch).

	* configure.ac (libc_cv_asm_weak_directive): Remove configure
	test.
	(libc_cv_asm_weakext_directive): Likewise.
	* configure: Regenerated.
	* config.h.in (HAVE_ASM_WEAK_DIRECTIVE): Remove #undef.
	(HAVE_ASM_WEAKEXT_DIRECTIVE): Likewise.
	* include/libc-symbols.h
	[!HAVE_ASM_WEAK_DIRECTIVE && !HAVE_ASM_WEAKEXT_DIRECTIVE]: Remove
	#error.
	[HAVE_ASM_WEAKEXT_DIRECTIVE]: Remove conditional code.
	[!HAVE_ASM_WEAKEXT_DIRECTIVE]: Make code unconditional.
2015-10-19 12:06:00 +00:00
Joseph Myers
2b714df5d8 Remove -Bgroup configure test.
There is a configure test for the -Bgroup linker option whose results
aren't used anywhere.  This patch removes that test.

Tested for x86_64 (testsuite, and that installed shared libraries are
unchanged by the patch).

	* configure.ac (libc_cv_Bgroup): Remove configure test.
	* configure: Regenerated.
	* config.make.in (have-Bgroup): Remove variable.
2015-10-15 23:36:22 +00:00
Joseph Myers
3d0dbdc467 Remove sizeof (long double) configure test.
There is a configure test for sizeof (long double) whose results
aren't used anywhere.  This patch removes that test.

Tested for x86_64 (testsuite, and that installed shared libraries are
unchanged by the patch).

	* configure.ac (sizeof_long_double): Remove configure test.
	* configure: Regenerated.
	* config.make.in (sizeof-long-double): Remove variable.
2015-10-15 23:30:42 +00:00
Joseph Myers
56ab386964 Remove -fexceptions configure test.
There is a configure test for -fexceptions.  This option was added in
GCC 2.8, so the test is obsolete - and indeed plenty of code is using
-fexceptions directly.  This patch removes the configure test and
makes all uses of $(exceptions) use -fexceptions directly.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_gcc_exceptions): Remove configure test.
	* configure: Regenerated.
	* sysdeps/arm/configure.ac (libc_cv_gcc_exceptions): Do not set
	variable.
	(exceptions): Likewise.
	* sysdeps/arm/configure: Regenerated.
	* config.make.in (exceptions): Remove variable.
	* Makeconfig (uses-callbacks): Use -fexceptions instead of
	$(exceptions).
	* debug/Makefile (CFLAGS-dprintf_chk.c): Likewise.
	(CFLAGS-vdprintf_chk.c): Likewise.
	(CFLAGS-printf_chk.c): Likewise.
	(CFLAGS-fprintf_chk.c): Likewise.
	(CFLAGS-vprintf_chk.c): Likewise.
	(CFLAGS-vfprintf_chk.c): Likewise.
	(CFLAGS-gets_chk.c): Likewise.
	(CFLAGS-fgets_chk.c): Likewise.
	(CFLAGS-fgets_u_chk.c): Likewise.
	(CFLAGS-fread_chk.c): Likewise.
	(CFLAGS-fread_u_chk.c): Likewise.
	(CFLAGS-wprintf_chk.c): Likewise.
	(CFLAGS-fwprintf_chk.c): Likewise.
	(CFLAGS-vwprintf_chk.c): Likewise.
	(CFLAGS-vfwprintf_chk.c): Likewise.
	(CFLAGS-fgetws_chk.c): Likewise.
	(CFLAGS-fgetws_u_chk.c): Likewise.
	* libio/Makefile (CFLAGS-fileops.c): Likewise.
	(CFLAGS-fputc.c): Likewise.
	(CFLAGS-fputwc.c): Likewise.
	(CFLAGS-freopen64.c): Likewise.
	(CFLAGS-freopen.c): Likewise.
	(CFLAGS-fseek.c): Likewise.
	(CFLAGS-fseeko64.c): Likewise.
	(CFLAGS-fseeko.c): Likewise.
	(CFLAGS-ftello64.c): Likewise.
	(CFLAGS-ftello.c): Likewise.
	(CFLAGS-fwide.c): Likewise.
	(CFLAGS-genops.c): Likewise.
	(CFLAGS-getc.c): Likewise.
	(CFLAGS-getchar.c): Likewise.
	(CFLAGS-getwc.c): Likewise.
	(CFLAGS-getwchar.c): Likewise.
	(CFLAGS-iofclose.c): Likewise.
	(CFLAGS-iofflush.c): Likewise.
	(CFLAGS-iofgetpos64.c): Likewise.
	(CFLAGS-iofgetpos.c): Likewise.
	(CFLAGS-iofgets.c): Likewise.
	(CFLAGS-iofgetws.c): Likewise.
	(CFLAGS-iofputs.c): Likewise.
	(CFLAGS-iofputws.c): Likewise.
	(CFLAGS-iofread.c): Likewise.
	(CFLAGS-iofsetpos64.c): Likewise.
	(CFLAGS-iofsetpos.c): Likewise.
	(CFLAGS-ioftell.c): Likewise.
	(CFLAGS-iofwrite.c): Likewise.
	(CFLAGS-iogetdelim.c): Likewise.
	(CFLAGS-iogetline.c): Likewise.
	(CFLAGS-iogets.c): Likewise.
	(CFLAGS-iogetwline.c): Likewise.
	(CFLAGS-ioputs.c): Likewise.
	(CFLAGS-ioseekoff.c): Likewise.
	(CFLAGS-ioseekpos.c): Likewise.
	(CFLAGS-iosetbuffer.c): Likewise.
	(CFLAGS-iosetvbuf.c): Likewise.
	(CFLAGS-ioungetc.c): Likewise.
	(CFLAGS-ioungetwc.c): Likewise.
	(CFLAGS-oldfileops.c): Likewise.
	(CFLAGS-oldiofclose.c): Likewise.
	(CFLAGS-oldiofgetpos64.c): Likewise.
	(CFLAGS-oldiofgetpos.c): Likewise.
	(CFLAGS-oldiofsetpos64.c): Likewise.
	(CFLAGS-oldiofsetpos.c): Likewise.
	(CFLAGS-peekc.c): Likewise.
	(CFLAGS-putc.c): Likewise.
	(CFLAGS-putchar.c): Likewise.
	(CFLAGS-putwc.c): Likewise.
	(CFLAGS-putwchar.c): Likewise.
	(CFLAGS-rewind.c): Likewise.
	(CFLAGS-wfileops.c): Likewise.
	(CFLAGS-wgenops.c): Likewise.
	(CFLAGS-oldiofopen.c): Likewise.
	(CFLAGS-iofopen.c): Likewise.
	(CFLAGS-iofopen64.c): Likewise.
	(CFLAGS-oldtmpfile.c): Likewise.
	* stdio-common/Makefile (CFLAGS-vfprintf.c): Likewise.
	(CFLAGS-fprintf.c): Likewise.
	(CFLAGS-printf.c): Likewise.
	(CFLAGS-vfwprintf.c): Likewise.
	(CFLAGS-vfscanf.c): Likewise.
	(CFLAGS-vfwscanf.c): Likewise.
	(CFLAGS-fscanf.c): Likewise.
	(CFLAGS-scanf.c): Likewise.
	(CFLAGS-isoc99_vfscanf.c): Likewise.
	(CFLAGS-isoc99_vscanf.c): Likewise.
	(CFLAGS-isoc99_fscanf.c): Likewise.
	(CFLAGS-isoc99_scanf.c): Likewise.
	* wcsmbs/Makefile (CFLAGS-isoc99_wscanf.c): Likewise.
	(CFLAGS-isoc99_fwscanf.c): Likewise.
	(CFLAGS-isoc99_vwscanf.c): Likewise.
	(CFLAGS-isoc99_vfwscanf.c): Likewise.
2015-10-15 22:35:13 +00:00
Joseph Myers
75b0964bc8 Remove .previous, .popsection configure tests.
There is a configure test for the assembler .previous directive, and,
as a fallback, for .popsection.

glibc now only supports ELF.  For ELF, the GNU assembler has supported
.previous since version 2.2 (support added by

Mon Jul 19 15:21:20 1993  Ken Raeburn  (raeburn@rtl.cygnus.com)

        * config/obj-elf.c (obj_elf_previous): New function.
        (previous_section, previous_subsection): New vars.
        (obj_elf_section): Save current place in case DWARF code wants us
        to pop back to it.  Handle unquoted section name as well as quoted
        section name.  Don't crash on invalid strings.
        (obj_pseudo_table): Handle new pseudos "previous", "2byte", and
        "4byte".

).  Thus this configure test is obsolete, and this patch removes it
(and with it the fallback .popsection test).

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_asm_previous_directive): Remove configure
	test.
	(libc_cv_asm_popsection_directive): Likewise.
	* configure: Regenerated.
	* config.h.in (HAVE_ASM_PREVIOUS_DIRECTIVE): Remove #undef.
	(HAVE_ASM_POPSECTION_DIRECTIVE): Likewise.
	* include/libc-symbols.h [HAVE_ASM_PREVIOUS_DIRECTIVE]
	(__make_section_unallocated): Make definition unconditional.
	[HAVE_ASM_POPSECTION_DIRECTIVE] (__make_section_unallocated):
	Remove conditional definition.
	[!HAVE_ASM_PREVIOUS_DIRECTIVE && !HAVE_ASM_POPSECTION_DIRECTIVE]
	(__make_section_unallocated): Likewise.
2015-10-15 19:47:55 +00:00
Joseph Myers
30f58bb192 Remove -static-libgcc configure test.
There is a configure test for -static-libgcc.  GCC added this option
in version 3.0, so this test is obsolete; this patch removes it.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_gcc_static_libgcc): Remove configure test.
	* configure: Regenerated.
	* config.make.in (static-libgcc): Remove variable.
	* Makerules (build-shlib-helper): Use -static-libgcc instead of
	$(static-libgcc).
	(build-module-helper): Likewise.
2015-10-15 19:32:58 +00:00
Joseph Myers
06e2c64669 Remove stddef.h configure test.
There is a configure test "for libc-friendly stddef.h", which sets a
makefile variable stddef.h that appears to be nowhere used.  It
appears the uses of this variable were removed by:

Tue Feb 21 00:10:50 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>

        * Makefile (headers): Remove $(stddef.h).
        * Makeconfig (stddef.h): Variable removed; now require gcc version
        >= 2.2.
        * stddef.h: File removed.

(having been added by

Wed May 26 14:44:19 1993  Roland McGrath  (roland@churchy.gnu.ai.mit.edu)

        * configure.in (autoconf checks): Add new check for a
        libc-friendly stddef.h.

so the test was of use for less than two years, before being obsolete
for over 20 years).  This patch removes the test.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_friendly_stddef): Remove configure test.
	* configure: Regenerated.
2015-10-15 19:31:46 +00:00
Florian Weimer
99e1dc0a68 Add a test case for C++11 thread_local support
This requires a C++ compiler with thread_local support, and a new
configure check is needed.
2015-10-06 21:27:55 +02:00
Mike Frysinger
1cba4036b6 timezone: add a configure flag to disable program install
Some distros build+install the timezone tools (zic/zdump/tzselect) outside
of glibc and use the upstream package directly.  Add a configure flag to
glibc so they can disable install of those tools.

This allows tests to run & pass regardless of the configure flag.  Only
the install of them is impacted.
2015-09-18 19:39:46 -04:00
H.J. Lu
cc08749b2d Support compilers defaulting to PIE
To support building glibc with GCC 6 configured with --enable-default-pie,
which generates PIE by default, we need to build programs as PIE.  But
elf/tst-dlopen-aout must not be built as PIE since it tests dlopen on
ET_EXEC file and PIE is ET_DYN.

	[BZ #17841]
	* Makeconfig (no-pie-ldflag): New.
	(+link): Set to $(+link-pie) if default to PIE.
	(+link-tests): Set to $(+link-pie-tests) if default to PIE.
	* config.make.in (build-pie-default): New.
	* configure.ac (libc_cv_pie_default): New.  Set to yes if -fPIE
	is default.  AC_SUBST.
	* configure: Regenerated.
	* elf/Makefile (LDFLAGS-tst-dlopen-aout): New.
2015-06-25 02:49:53 -07:00
Andrew Senkevich
5695d46f5d This is update for configure, build and install of vector math library.
Installation of libm.so as linker script only in case of libmvec.so build.

2015-05-14  Andrew Senkevich  <andrew.n.senkevich@gmail.com>

    * Makeconfig (rpath-dirs, all-subdirs): Added mathvec folder.
    (libmvec): New variable.
    * configure.ac: Added option for mathvec build.
    * configure: Regenerated.
    * mathvec/Depend: New file.
    * mathvec/Makefile: New file.
    * shlib-versions: Added libmvec.
    * math/Makefile: Added rule for libm.so installation.
2015-05-14 18:07:06 +03:00
Roland McGrath
054392910b Let non-add-on preconfigure scripts set libc_config_ok. 2015-04-09 13:55:11 -07:00
H.J. Lu
83569fb894 Add a testcase for copy reloc against protected data
Linkers in some versions of binutils 2.25 and 2.26 don't support protected
data symbol with error messsage like:

/usr/bin/ld: copy reloc against protected `bar' is invalid
/usr/bin/ld: failed to set dynamic section sizes: Bad value

We check if linker supports copy reloc against protected data symbol to
avoid running the test if linker is broken.

	[BZ #17711]
	* config.make.in (have-protected-data): New.
	* configure.ac: Check linker support for protected data symbol.
	* configure: Regenerated.
	* elf/Makefile (modules-names): Add tst-protected1moda and
	tst-protected1modb if $(have-protected-data) is yes.
	(tests): Add tst-protected1a and tst-protected1b if
	$(have-protected-data) is yes.
	($(objpfx)tst-protected1a): New.
	($(objpfx)tst-protected1b): Likewise.
	(tst-protected1modb.so-no-z-defs): Likewise.
	* elf/tst-protected1a.c: New file.
	* elf/tst-protected1b.c: Likewise.
	* elf/tst-protected1mod.h: Likewise.
	* elf/tst-protected1moda.c: Likewise.
	* elf/tst-protected1modb.c: Likewise.
2015-03-31 05:21:12 -07:00
Roland McGrath
e4693aa7c1 Avoid C++ tests when the C++ cannot be linked. 2015-03-04 13:52:45 -08:00
Samuel Thibault
ebf27d12e6 Revert "hurd: Fix abi-tag, following ba90e05"
and revert the corresponding part of ba90e05 which was making the fix
	necessary.

	* abi-tags: Revert ae20c9a: rename back gnu into gnu-gnu.
	* configure.ac, configure: Revert ba90e05: modify gnu-* host_os back
	into gnu-gnu, and update comment to refer to abi-tags.
2015-02-11 23:51:51 +00:00
Will Newton
cc8623f196 Require bison 2.7 or newer for regenerating intl/plural.y
The merge of the latest gettext code introduced changes to the yacc
parser source that are incompatible with versions of bison older
than 2.7. Add a configure check for the appropriate versions and
document the requirement in INSTALL.

ChangeLog:

2014-12-22  Will Newton  <will.newton@linaro.org>

	* manual/install.texi: Document that we require bison 2.7
	or above.
	* INSTALL: Regenerate.
	* configure.ac: Use AC_CHECK_PROG_VER instead of
	AC_PATH_PROG when checking for bison and check for
	version 2.7 or above.
	* configure: Regenerate.
2014-12-22 11:57:40 +00:00
Will Newton
3a12c70f13 Bump required version of texinfo to 4.7
It seems we require texinfo 4.7 for the --plaintext option, so
document that and check for the correct version in configure.

ChangeLog:

2014-12-15  Will Newton  <will.newton@linaro.org>

	* manual/install.texi: Bump required version of texinfo
	to 4.7 from 4.5.
	* INSTALL: Regenerated.
	* configure.ac: Check for makeinfo version 4.7 and above.
	* configure: Regenerated.
2014-12-15 08:59:31 +00:00
Joseph Myers
a4ecc9eb9b Use -Werror by default, add --disable-werror.
As discussed starting at
<https://sourceware.org/ml/libc-alpha/2014-11/msg00323.html>, this
patch makes the glibc build use -Werror by default to avoid
accidentally adding new warnings to the build.  The configure option
--disable-werror can be used to disable this.

-Wno-error=undef is temporarily used because the build isn't clean
regarding -Wundef warnings.  The idea is that once the remaining
-Wundef warnings have been cleaned up (in at least one configuration),
-Wno-error=undef will be removed.

I get a clean build and test on x86_64 (GCC 4.9 branch) with this
patch.  The expectation is that this may well break the build for some
other configurations, and people seeing such breakage should make
appropriate fixes to fix or suppress the warnings for their
configurations.  In some cases that may involve using pragmas as the
right fix (I think that will be right for the -Wno-inline issue for
MIPS I referred to in
<https://sourceware.org/ml/libc-alpha/2012-11/msg00798.html>, for
example), in some cases -Wno-error in sysdeps makefiles (__restore_rt
in MIPS sigaction, for example), in some cases substantive fixes for
the warnings.

Note that if, with a view to listing all the warnings then fixing them
all, you just look for "warning:" in output from building and testing
with --disable-werror, you'll see lots of warnings from the linker
about functions such as tmpnam.  Those warnings can be ignored - only
compiler warnings are relevant to -Werror, not linker warnings.

	* configure.ac (--disable-werror): New configure option.
	(enable_werror): New AC_SUBST.
	* configure: Regenerated.
	* config.make.in (enable-werror): New variable.
	* Makeconfig [$(enable-werror) = yes] (+gccwarn): Add -Werror
	-Wno-error=undef.
	(+gccwarn-c): Do not use -Werror=implicit-function-declaration.
	* manual/install.texi (Configuring and compiling): Document
	--disable-werror.
	* INSTALL: Regenerated.
	* debug/Makefile (CFLAGS-tst-chk1.c): Add -Wno-error.
	(CFLAGS-tst-chk2.c): Likewise.
	(CFLAGS-tst-chk3.c): Likewise.
	(CFLAGS-tst-chk4.cc): Likewise.
	(CFLAGS-tst-chk5.cc): Likewise.
	(CFLAGS-tst-chk6.cc): Likewise.
	(CFLAGS-tst-lfschk1.c): Likewise.
	(CFLAGS-tst-lfschk2.c): Likewise.
	(CFLAGS-tst-lfschk3.c): Likewise.
	(CFLAGS-tst-lfschk4.cc): Likewise.
	(CFLAGS-tst-lfschk5.cc): Likewise.
	(CFLAGS-tst-lfschk6.cc): Likewise.
2014-12-10 01:14:48 +00:00
Joseph Myers
4863355ad5 Require GCC 4.6 or later to build glibc.
As discussed in the thread starting at
<https://sourceware.org/ml/libc-alpha/2014-10/msg00792.html>, and
continuing into November, this patch increases the minimum GCC version
for building glibc to 4.6 (there seemed to be no clear consensus for
4.7).  In particular, this allows us to use #pragma GCC diagnostic for
fine-grained warning control with -Werror (subject to establishing a
suitable policy for that use).  The documentation has a statement, as
requested, about the most recent GCC version tested for building
glibc, and I've updated <https://sourceware.org/glibc/wiki/Release> to
refer to updating that statement.  A NEWS entry is added for this
change, although previous such changes didn't get them.

Tested for x86_64 (testsuite, and that installed shared libraries are
unchanged by this patch).

	* configure.ac (libc_cv_compiler_ok): Require GCC 4.6 or later.
	* configure: Regenerated.
	* manual/install.texi (Tools for Compilation): Document a
	requirement of GCC 4.6 or later and that GCC 4.9 is the newest
	compiler verified to work.
	* INSTALL: Regenerated.
2014-11-14 18:00:34 +00:00
Andrew Senkevich
bd80507166 Update minimal required bunutils version to 2.22 2014-11-10 11:16:46 -08:00
Roland McGrath
461a7b1e45 Rework compiler version check in configure. 2014-10-24 14:45:47 -07:00
H.J. Lu
f4a58f0d35 Require autoconf 2.69
* aclocal.m4: Require autoconf 2.69.
	* configure: Regenerated.
	* sysdeps/aarch64/configure: Likewise.
	* sysdeps/alpha/configure: Likewise.
	* sysdeps/arm/armv7/configure: Likewise.
	* sysdeps/arm/configure: Likewise.
	* sysdeps/ia64/configure: Likewise.
	* sysdeps/mach/configure: Likewise.
	* sysdeps/mips/configure: Likewise.
	* sysdeps/s390/configure: Likewise.
	* sysdeps/unix/sysv/linux/mips/configure: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/configure: Likewise.

	* sysdeps/alpha/configure.ac: Avoid empty lines at the end of
	file.
	* sysdeps/ia64/configure.ac: Likewise.
2014-09-29 07:53:36 -07:00
Joseph Myers
af296fcdab Remove bitrotten --enable-oldest-abi (bug 6652).
This patch removes the --enable-oldest-abi configure option, which has
long been bitrotten (as reported in bug 6652).  The principle of
removing this option was agreed in the thread starting at
<https://sourceware.org/ml/libc-alpha/2013-07/msg00174.html>.

Tested for x86_64 and x86 that the installed shared libraries other
than libc.so are unchanged by this patch and that libc.so disassembly
and symbol versions are unchanged (debug info changes because of
changed line numbers in csu/version.c).

	[BZ #6652]
	* Makeconfig (soversions-default-setname): Remove variable.
	($(common-objpfx)soversions.i): Don't pass default_setname to
	soversions.awk.
	* Makerules ($(common-objpfx)abi-versions.h): Don't pass
	oldest_abi to abi-versions.awk.
	* config.h.in (GLIBC_OLDEST_ABI): Remove macro undefine.
	* config.make.in (oldest-abi): Remove variable.
	* configure.ac (--enable-oldest-abi): Remove configure option.
	* configure: Regenerated.
	* csu/version.c (banner) [GLIBC_OLDEST_ABI]: Remove conditional
	text.
	* scripts/abi-versions.awk: Do not handle oldest_abi variable.
	* scripts/soversions.awk: Do not handle default_setname variable.
	* sysdeps/mach/hurd/configure.ac: Do not handle oldest_abi
	variable.
	* sysdeps/mach/hurd/configure: Regenerated.
	* sysdeps/unix/sysv/linux/configure.ac: Do not handle oldest_abi
	variable.
	* sysdeps/unix/sysv/linux/configure: Regenerated.
2014-09-16 17:45:03 +00:00
Joseph Myers
ba90e05052 Remove configuration name patterns from shlib-versions.
This patch removes the first column (patterns matching configuration
names) from shlib-versions, leaving shlib-versions entry selection
based purely on sysdeps directories.

An implication of this removal is that the default for any non-Linux
ports using NPTL will be the same SONAMEs for NPTL libraries as for
Linux (as those defaults, previously limited to .*-.*-linux.*, are
left in nptl/shlib-versions and nptl_db/shlib-versions).

Special host_os handling in configure.ac that was purely for
shlib-versions is removed.  (The host_os setting is still used for
libc-abis - see
<https://sourceware.org/ml/libc-alpha/2014-01/msg00375.html> regarding
that - but no entries there are affected by this change.)

Tested on x86_64 and x86 that the installed shared libraries are
unchanged by this patch.

	* scripts/soversions.awk: Do not handle configuration names.
	* Makeconfig ($(common-objpfx)soversions.i): Do not pass cpu,
	vendor and os variables to soversions.awk.
	* configure.ac: Do not modify gnu-* host_os.
	* configure: Regenerated
	* shlib-versions: Remove first column with configuration names.
	* nptl/shlib-versions: Likewise.
	* nptl_db/shlib-versions: Likewise.
	* sysdeps/hppa/shlib-versions: Likewise.
	* sysdeps/m68k/shlib-versions: Likewise.
	* sysdeps/mach/hurd/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/alpha/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/arm/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/hppa/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/ia64/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/mips/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/shlib-versions:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/sh/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/tile/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/shlib-versions: Likewise.

libidn/ChangeLog:
	* shlib-versions: Remove first column with configuration names.
2014-09-12 12:28:47 +00:00
Mike Frysinger
61b1ef6e7c detect broken linker handling of __ehdr_start
Older versions of ld on ia64 support __ehdr_start, but generate relocs
when they shouldn't.  This causes the ld.so to not run because it tries
to resolve the __ehdr_start symbol (but it's not exported).
2014-08-12 19:54:02 -04:00
Roland McGrath
9fe7e787ad Use __builtin_trap for ABORT_INSTRUCTION. 2014-07-31 13:07:19 -07:00
Joseph Myers
cb403c34c6 Remove relro configure test.
This patch removes the configure test for working -z relro.

The use of -z relro in Makeconfig became unconditional with

commit 2e6ab1df44c412bb9d30b26a4d8a679150a7e375
Author: Ulrich Drepper <drepper@redhat.com>
Date:   Sat Oct 28 06:44:04 2006 +0000

    Remove conditional code which now is unnecessary.

(commit reference from git://repo.or.cz/glibc/history), so since then
the configure test has not controlled anything about how glibc is
built - simply about whether configure succeeds and allows a build to
be attempted.  The test for whether the option did something useful
(as opposed to whether it exists - which we can certainly just assume
by now) was originally added in
<https://sourceware.org/ml/libc-hacker/2004-09/msg00069.html> to
disable the option in a case when it did nothing useful on ia64 (as a
result of something deliberate in the linker on ia64).  Since 2006
that disabling has been of no effect, and given that the current test
does not set libc_relro_required for ia64, it does nothing whatever
useful for the original motivating case.  Also at around the same time
in 2006 the test was made to give an error for missing or broken -z
relro support on various architectures.

So effectively all the test does now is verify that, on certain
architectures, the linker has not been changed deliberately to make
the option ineffective.  I see no apparent reason why such a change
should be expected, or why the build should be stopped if it were to
be made (any more than we disallow build on ia64); I think we can
trust binutils patch review to point out the consequences of any
change to COMMONPAGESIZE setting.  The only thing that might now make
sense would be disabling the -z relro use on an architecture-specific
basis if there were an architecture-specific reason to consider that
to make sense; it would be for the ia64 maintainer to decide if that
makes sense for ia64 at present, but I think that could be done
through sysdeps Makefiles - no special configure tests needed.

Tested for x86_64 that this patch makes no change to the installed
shared libraries.

Together with
<https://sourceware.org/ml/libc-alpha/2014-06/msg00788.html> (pending
review) this substantially eliminates architecture-specific cases from
architecture-independent configure.ac files.  There remains an i386
case in sysdeps/mach/hurd/configure.ac that should properly move to
the i386 subdirectory.  (There are also OS-specific cases outside
OS-specific directories; in principle I think should should also
move.)

	* configure.ac (libc_commonpagesize): Remove variable.
	(libc_relro_required): Likewise.
	(libc_cv_z_relro): Remove configure test.
	* configure: Regenerated.
	* sysdeps/aarch64/preconfigure (libc_commonpagesize): Do not set
	variable.
	(libc_relro_required): Likewise.
	* sysdeps/alpha/preconfigure (libc_commonpagesize): Likewise.
	(libc_relro_required): Likewise.
	* sysdeps/arm/preconfigure.ac (libc_commonpagesize): Likewise.
	(libc_relro_required): Likewise.
	* sysdeps/arm/preconfigure: Regenerated.
	* sysdeps/ia64/preconfigure: Remove file.
	* sysdeps/tile/preconfigure (libc_commonpagesize): Do not set
	variable.
	(libc_relro_required): Likewise.
2014-06-27 16:51:22 +00:00
Joseph Myers
e64708de36 Remove powerpc special cases in configure.ac.
This patch removes two powerpc special cases in the main configure.ac.
The test for rs6000 is irrelevant to currently supported
configurations (config.guess reports rs6000 for some OSes, of which
the only one currently supported by GCC is AIX, but not for Linux).
There's no need either for a special case for powerpc*-*soft;
--without-fp suffices, and GCC doesn't have any special handling of
such a triplet.

Not tested.

	* configure.ac: Do not test for machine being rs6000.  Do not test
	for powerpc*-*soft.
	* configure: Regenerated.
2014-06-26 17:34:27 +00:00
Joseph Myers
a8779c28a8 Remove configure tests for assembler CFI support.
This patch removes configure tests for assembler CFI support (and
thereby eliminates an architecture-specific case in the main
configure.ac), instead assuming that support is present
unconditionally.

The main test was added in 2003 around the time CFI support was added
to the assembler.  cfi_personality and cfi_lsda support were added to
the assembler in 2006.  cfi_sections support was added in 2009, a few
weeks before binutils 2.20 was released; it's in 2.20, the minimum
supported version, so even that configure test is obsolete.

Tested x86_64 that the installed shared libraries are unchanged by
this patch.

	* configure.ac (libc_cv_asm_cfi_directives): Remove configure
	test.
	* configure: Regenerated.
	* config.h.in (HAVE_ASM_CFI_DIRECTIVES): Remove macro undefine.
	* sysdeps/arm/configure.ac (libc_cv_asm_cfi_directive_sections):
	Remove configure test.
	* sysdeps/arm/configure: Regenerated.
	* sysdeps/nptl/configure.ac: Do not check
	libc_cv_asm_cfi_directives.
	* sysdeps/nptl/configure: Regenerated.
	* sysdeps/x86_64/nptl/configure.ac: Remove file.
	* sysdeps/x86_64/nptl/configure: Remove generated file.
	* b/sysdeps/generic/sysdep.h [HAVE_ASM_CFI_DIRECTIVES]: Make code
	unconditional.
	[!HAVE_ASM_CFI_DIRECTIVES]: Remove conditional code.
2014-06-26 17:33:32 +00:00
Joseph Myers
c2570a0b35 Move USE_REGPARMS define to sysdeps/i386/configure.ac.
This patch moves the USE_REGPARMS define from the toplevel
configure.ac to sysdeps/i386/configure.ac.

Tested x86 that the disassembly of installed shared libraries is
unchanged by this patch.

	* configure.ac (USE_REGPARMS): Don't define here.
	* configure: Regenerated.
	* sysdeps/i386/configure.ac (USE_REGPARMS): Define here.
	* sysdeps/i386/configure: Regenerated.
2014-06-25 20:26:14 +00:00
Joseph Myers
92072d57c6 Remove BROKEN_PPC_ASM_CR0 configure test.
One piece of architecture-specific code in the main configure.ac is
the powerpc test that can define BROKEN_PPC_ASM_CR0.  There's no need
to move this to a sysdeps configure script, or to work out what bug it
was testing in May 1998 to see if it's still relevant, since nothing
in the source tree now uses the results of this test.  Thus, this
patch just removes the test in question.

Not tested.

	* configure.ac (libc_cv_c_asmcr0_bug): Remove configure test.
	* configure: Regenerated.
	* config.h.in (BROKEN_PPC_ASM_CR0): Remove macro.
2014-06-25 17:54:44 +00:00
Joseph Myers
3e239be647 Move base_machine and machine settings from configure.ac to sysdeps preconfigure fragments.
This patch makes non-ex-ports architectures set base_machine and
machine based on the original configured machine value in preconfigure
fragments, like ex-ports architectures, rather than in the toplevel
configure.ac.

Tested x86 that the disassembly of installed shared libraries is
unchanged by the patch.

	* configure.ac (base_machine): Do not set specially for particular
	machines here.
	* configure: Regenerated.
	* sysdeps/powerpc/preconfigure: Move machine and base_machine
	settings from configure.ac.
	* sysdeps/i386/preconfigure: New file.
	* sysdeps/s390/preconfigure: Likewise.
	* sysdeps/sh/preconfigure: Likewise.
	* sysdeps/sparc/preconfigure: Likewise.
2014-06-25 17:52:56 +00:00
Dominik Vogt
5a414ff70c S/390: Port of lock elision to System/z
Added support for TX lock elision of pthread mutexes on s390 and
s390x.  This may improve lock scaling of existing programs on TX
capable systems.  The lock elision code is only built with
--enable-lock-elision=yes and then requires a GCC version supporting
the TX builtins.  With lock elision default mutexes are elided via
__builtin_tbegin, if the cpu supports transactions. By default lock
elision is not enabled and the elision code is not built.
2014-05-09 16:58:46 +02:00
Carlos O'Donell
0699f766b1 nscd: Make SELinux checks dynamic.
The SELinux team has indicated to me that glibc's SELinux checks
in nscd are not being carried out as they would expect the API
to be used today. They would like to move away from static header
defines for class and permissions and instead use dynamic checks
at runtime that provide an answer which is dependent on the runtime
status of SELinux i.e. more dynamic.

The following patch is a minimal change that moves us forward in
this direction.

It does the following:

* Stop checking for SELinux headers that define NSCD__SHMEMHOST.
  Check only for the presence or absence of the library.

* Don't encode the specific SELinux permission constants into a
  table at build time, and instead use the symbolic name for the
  permission as expected.

* Lookup the "What do we do if we don't know this permission?"
  policy and use that if we find SELinux's policy is older than
  the glibc policy e.g. we make a request for a permission that
  SELinux doesn't know about.

* Lastly, translate the class and permission and then make
  the permission check. This is done every time we lookup
  a permission, and this is the expected way to use the API.
  SELinux will optimize this for us, and we expect the network
  latencies to hide these extra library calls.

Tested on x86, x86-64, and via Fedora Rawhide since November 2013.

See:
https://sourceware.org/ml/libc-alpha/2014-04/msg00179.html
2014-04-14 04:10:39 -04:00
Adhemerval Zanella
7ffa942302 PowerPC: define _CALL_ELF if compiler does not
This patch makes the configure adds -D_CALL_ELF=1 when compiler does
not define _CALL_ELF (versions before powerpc64le support).  It cleans
up compiler warnings on old compiler where _CALL_ELF is not defined
on powerpc64(be) builds.

It does by add a new config.make variable for configure-deduced
CPPFLAGS and accumulate into that (confix-extra-cppflags).  It also
generalizes libc_extra_cflags so it accumulates in sysdeps configure
fragmenets.
2014-04-06 16:48:08 -05:00
Mike Frysinger
43ca83ecc4 stop supporting bash-1.x
We've stopped supporting toolchain packages older than 2009, so punting
bash-1.x is reasonable when bash-2 was released almost 20 years ago.
2014-03-13 20:20:12 -04:00
Mike Frysinger
c66e48b4a7 delete ksh checks
Nothing in the tree uses ksh anymore, so punt these checks.
2014-03-13 20:03:31 -04:00
Roland McGrath
44c4e5d598 Use __ehdr_start, when available, for rtld to get its own headers. 2014-03-13 10:38:27 -07:00
Allan McRae
9e8ac24ba3 Set AUTOCONF variable when maintainer-mode is not used
Fixes build issue introduced in 8894bad3 when configure.ac is altered
and maintainer-mode is not enabled.
2013-12-16 21:45:27 +10:00
Allan McRae
8894bad34c Add --enable-maintainer-mode configure option
Autoconf is tested for and run if needed only when --enable-maintainer-mode
is used on configure.  This results in the autom4te.cache directory only
being written in the source directory during configure if automatic
autoconf usage is requested.

Fixes BZ #14120.
2013-12-16 11:26:49 +10:00
Marc-Antoine Perennou
28d708c44b Accept make versions 4.0 and greater 2013-10-31 12:38:36 +10:00
Mike Frysinger
cb8a6dbd17 rename configure.in to configure.ac
Autoconf has been deprecating configure.in for quite a long time.
Rename all our configure.in and preconfigure.in files to .ac.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2013-10-30 17:32:08 +10:00
Alan Modra
8f9ebb08af PowerPC LE configury
http://sourceware.org/ml/libc-alpha/2013-08/msg00096.html

This adds the basic configury bits for powerpc64le and powerpcle.

	* configure.in: Map powerpc64le and powerpcle to base_machine/machine.
	* configure: Regenerate.
	* nptl/shlib-versions: Powerpc*le starts at 2.18.
	* shlib-versions: Likewise.
2013-10-04 10:42:27 +09:30
Joseph Myers
3f2e46a494 Remove --disable-versioning. 2013-09-04 15:25:42 +00:00
Mike Frysinger
8c12f01d07 configure: add missing quotes in $build_pt_chown test
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2013-08-25 16:02:09 -04:00
Carlos O'Donell
e4608715e6 CVE-2013-2207, BZ #15755: Disable pt_chown.
The helper binary pt_chown tricked into granting access to another
user's pseudo-terminal.

Pre-conditions for the attack:

 * Attacker with local user account
 * Kernel with FUSE support
 * "user_allow_other" in /etc/fuse.conf
 * Victim with allocated slave in /dev/pts

Using the setuid installed pt_chown and a weak check on whether a file
descriptor is a tty, an attacker could fake a pty check using FUSE and
trick pt_chown to grant ownership of a pty descriptor that the current
user does not own.  It cannot access /dev/pts/ptmx however.

In most modern distributions pt_chown is not needed because devpts
is enabled by default. The fix for this CVE is to disable building
and using pt_chown by default. We still provide a configure option
to enable hte use of pt_chown but distributions do so at their own
risk.
2013-07-21 15:39:55 -04:00
Siddhesh Poyarekar
52dfbe137e Fix lock elision help text in INSTALL and configure 2013-07-04 20:33:03 +05:30
Andi Kleen
1717da59ae Add a configure option to enable lock elision and disable by default
Can be enabled with --enable-lock-elision=yes at configure time.
2013-07-02 08:46:55 -07:00
Joseph Myers
cbe7d24bb4 Require GCC 4.4 or later to build glibc. 2013-06-26 23:10:48 +00:00
Adhemerval Zanella
85c2e6110c Fix loop construction to functions calls
Check wheter the compiler has the option -fno-tree-loop-distribute-patterns
to inhibit loop transformation to library calls and uses it on memset
and memmove default implementation to avoid recursive calls.
2013-06-20 19:42:05 -05:00
Roland McGrath
12086fb483 Sort sysd-rules-patterns by descending pattern length. 2013-06-17 09:55:49 -07:00
Carlos O'Donell
0f122b8d12 Configuring for i386 is no longer supported.
We no longer support configuring for i386, nor do we
elide such a configuration to i686. Configuring with
i386-* is a failure, and we provide an example of
how to fix that.

---

2013-04-17  Carlos O'Donell  <carlos@redhat.com>

	* configure.in: Remove i386 configure warning. Remove i386 case.
	* configure: Regenerate.
	* sysdeps/i386/configure.in: Raise error if config_machine is i386.
	Add example to error message.
	* sysdeps/i386/configure: Regenerate.
2013-04-17 17:13:20 -07:00
Carlos O'Donell
a01f19c8fb i386: Fail at configure time for i386 builds.
This change does two things:

* Treats a target i386-* as if it were i686.
* Fails configure if the user is generating code
  for i386.

We no longer support i386 code-generation because the i386
lacks the atomic operations we need in glibc.

You can still configure for i386-*, but you get i686 code.

You can't build with --march=i386, --mtune=i386 or a compiler
that defaults to i386 code-generation.

I've added two i386 entries in the master todo list to discuss
merging and renaming:
http://sourceware.org/glibc/wiki/Development_Todo/Master#i386

The failure modes are fail-safe here. You compile for i386,
get i686, and try to run on i386 and it fails. The configure
log has a warning saying we elided to i686. There is no situation
that I can see where we run into any serious problems.

The patch makes the current state better in that we get less
confused users and we build successfully in more default
configurations.

The next enhancement would be to add --march=i?86
as suggested in #c20 of BZ#10062 for any i?86-* builds, which
would solve the problem of a 32-bit compiler that defaults to
i386 code-gen and glibc configured for i686-* target. Which
previously failed at build time, and now will fail at configure
time (requires adding --march=i686).

Updated NEWS with BZ #10060 and #10062.

No regressions.

---

2013-04-06  Carlos O'Donell  <carlos@redhat.com>

	[BZ #10060, #10062]
	* aclocal.m4 (LIBC_COMPILER_BUILTIN_INLINED): New macro.
	* sysdeps/i386/configure.in: Use LIBC_COMPILER_BUILTIN_INLINED and
	fail configure if __sync_val_compare_and_swap is not inlined.
	* sysdeps/i386/configure: Regenerate.
	* configure.in: Build for i686 when configured for i386.
	* configure: Regenerate.
	* README: Remove i386 reference.
2013-04-06 12:00:35 -04:00
Joseph Myers
bef0b50749 Move system-specific settings out of toplevel configure.in and config.make.in. 2013-03-20 22:37:06 +00:00
Andreas Schwab
aaa8cb4b43 Add support for rtld directory different from slib directory 2013-03-19 12:07:26 +01:00
Thomas Schwinge
b5a5da2376 Don't bother checking for $CC option to accept ISO C89. 2013-01-25 12:44:45 +01:00
Thomas Schwinge
bb931195fe configure: Default to CPP="$CC -E" unless overridden. 2013-01-25 12:33:19 +01:00
Roland McGrath
6270516e15 Fix multiarch handling in sysdeps generation. 2013-01-11 16:00:49 -08:00
H.J. Lu
740b3dbee8 Add --enable-hardcoded-path-in-tests configure option 2013-01-11 07:14:18 -08:00
Roland McGrath
1c9f1a028a Remove some old cruft variables from configure. 2013-01-10 16:22:45 -08:00
Adam Conrad
6706074627 Fix C++ header directory detection for non-standard paths.
Stop assuming specific path layouts for C++ headers, and instead
use an autodetection method that looks for paths with '/[cg]++'
in the g++ include list.
2012-11-24 23:58:38 -07:00
H.J. Lu
6bfea97493 Properly check linker -z XXX support 2012-11-21 12:34:32 -08:00
Andreas Schwab
786b0b67a3 Fix ifunc configure check for 64-bit targets 2012-11-18 16:30:16 +01:00
Joseph Myers
8b748aed2a Support --with-pkgversion and --with-bugurl. 2012-11-09 22:13:45 +00:00
Roland McGrath
6e6249d0b4 BZ#14743: Move clock_* symbols from librt to libc. 2012-10-24 14:50:46 -07:00
Mike Frysinger
0cae3f4b03 change ifunc assembly test to a link test
The test currently tests the binutils frontend support which passes for
all versions of binutils we currently require (2.20+).  It doesn't test
the backend which is required for ifunc to actually work, and which most
targets don't yet support.

Change the assembly code so that when we link it, we get a file that has
ifunc relocations if the backend supports it.  That way we can test to
see if binutils supports everything we need.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-10-24 17:01:13 -04:00
Mike Frysinger
8175a2532b drop -q flag when using grep
We don't currently want to rely on the -q option to grep.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-10-24 13:00:48 -04:00
Joseph Myers
728e272aec Remove relics of support for configuring in the source directory. 2012-10-19 20:03:12 +00:00
Joseph Myers
1e4a95361c Use $CXX not cc1plus to locate C++ headers. 2012-10-10 22:07:36 +00:00
Roland McGrath
f57f805541 Clean up conditionalize of ld.so.cache support. 2012-10-03 16:13:14 -07:00
H.J. Lu
6551399088 Remove $(have-cpp-asm-debuginfo) check 2012-09-15 13:08:45 -07:00
Allan McRae
c4e85184d2 Improve C++ header location detection (bug 13966) 2012-09-06 00:16:24 +10:00
Allan McRae
0786794f3a Check for gawk >= 3.0 (bug 13412) 2012-09-02 09:30:18 +10:00
Roland McGrath
c53d909c80 Add --disable-build-nscd configure option. 2012-08-22 13:35:55 -07:00
Roland McGrath
3cc3ef96d6 BZ#13696: Add --disable-nscd configure option. 2012-08-22 13:31:12 -07:00
Dmitry V. Levin
07e5155066 Fix sed configure check for newer sed --version output. 2012-08-22 12:58:18 -07:00
Roland McGrath
c91c505f22 Make sysheaders available in config.make. 2012-08-17 14:05:53 -07:00
Marek Polacek
b67e9372b2 Get rid of ASM_TYPE_DIRECTIVE{,_PREFIX}. 2012-08-02 21:04:29 +02:00
Thomas Schwinge
576338111a configure.in <sysdeps resolving>: Correct printing Implies_before. 2012-07-23 12:27:12 +02:00
Marek Polacek
7b8e0d49cb Get rid of ASM_GLOBAL_DIRECTIVE. 2012-07-10 14:30:24 +02:00
Roland McGrath
4248b1b1cf Respect --localstatedir for /var/db parent directory. 2012-06-22 10:11:07 -07:00
Joseph Myers
4da0431d5f Weaken PIE configure test to a compile test. 2012-05-30 09:50:40 +00:00
H.J. Lu
918b56067a Don't use header files in glibc configure 2012-05-25 14:16:19 -07:00
Roland McGrath
3a097cc7a1 Add --enable-systemtap configuration to define static probe points. 2012-05-25 13:40:20 -07:00
Joseph Myers
59f0c22ed2 Filter out unknown symbols in stack-protector test. 2012-05-21 23:26:27 +00:00
Roland McGrath
30b99d798f BZ#10375: Configure magic to use -fno-stack-protector if needed. 2012-05-16 16:22:50 -07:00