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10 Commits

Author SHA1 Message Date
Joseph Myers
d709042a6e Fix lgamma setting signgam for ISO C (bug 15421). 
The lgamma (and likewise lgammaf, lgammal) function wrongly sets the
signgam variable even when building for strict ISO C conformance
(-std=c99 / -std=c11), although the user may define such a variable
and it's only in the implementation namespace for POSIX with XSI
extensions enabled.

Following discussions starting at
<https://sourceware.org/ml/libc-alpha/2013-04/msg00767.html> and
<https://sourceware.org/ml/libc-alpha/2015-10/msg00844.html>, it seems
that the safest approach for fixing this particular issue is for
signgam to become a weak alias for a newly exported symbol __signgam,
with the library functions only setting __signgam, at which point
static linker magic will preserve the alias for newly linked binaries
that refer to the library's signgam rather than defining their own,
while breaking the alias for programs that define their own signgam,
with new symbol versions for lgamma functions and with compat symbols
for existing binaries that set both signgam and __signgam.

This patch implements that approach for the fix.  signgam is made into
a weak alias.  The four symbols __signgam, lgamma, lgammaf, lgammal
get new symbol versions at version GLIBC_2.23, with the existing
versions of lgamma, lgammaf and lgammal becoming compat symbols.

When the compat versions are built, gamma, gammaf and gammal are
aliases for the compat versions (i.e. always set signgam); this is OK
as they are not ISO C functions, and avoids adding new symbol versions
for them unnecessarily.  When the compat versions are not built
(i.e. for static linking and for future glibc ports), gamma, gammaf
and gammal are aliases for the new versions that set __signgam.  The
ldbl-opt versions are updated accordingly.

The lgamma wrappers are adjusted so that the same source files,
included from different files with different definitions of
USE_AS_COMPAT, can build either the new versions or the compat
versions.  Similar changes are made to the ia64 versions (untested).

Tests are added that the lgamma functions do not interfere with a user
variable called signgam for ISO C, with various choices for the size
of that variable, whether it is initialized, and for static and
dynamic linking.  The conformtest whitelist entry is removed as well.

Tested for x86_64, x86, mips64 and powerpc, including looking at
objdump --dynamic-syms output to make sure the expected sets of
symbols were aliases.  Also spot-tested that a binary built with old
glibc works properly (i.e. gets signgam set) when run with new glibc.

	[BZ #15421]
	* sysdeps/ieee754/s_signgam.c (signgam): Rename to __signgam,
	initialize with 0 and define as weak alias of __signgam.
	* include/math.h [!_ISOMAC] (__signgam): Declare.
	* math/Makefile (libm-calls): Add w_lgamma_compat.
	(tests): Add test-signgam-uchar, test-signgam-uchar-init,
	test-signgam-uint, test-signgam-uint-init, test-signgam-ullong and
	test-signgam-ullong-init.
	(tests-static): Add test-signgam-uchar-static,
	test-signgam-uchar-init-static, test-signgam-uint-static,
	test-signgam-uint-init-static, test-signgam-ullong-static and
	test-signgam-ullong-init-static.
	(CFLAGS-test-signgam-uchar.c): New variable.
	(CFLAGS-test-signgam-uchar-init.c): Likewise.
	(CFLAGS-test-signgam-uchar-static.c): Likewise.
	(CFLAGS-test-signgam-uchar-init-static.c): Likewise.
	(CFLAGS-test-signgam-uint.c): Likewise.
	(CFLAGS-test-signgam-uint-init.c): Likewise.
	(CFLAGS-test-signgam-uint-static.c): Likewise.
	(CFLAGS-test-signgam-uint-init-static.c): Likewise.
	(CFLAGS-test-signgam-ullong.c): Likewise.
	(CFLAGS-test-signgam-ullong-init.c): Likewise.
	(CFLAGS-test-signgam-ullong-static.c): Likewise.
	(CFLAGS-test-signgam-ullong-init-static.c): Likewise.
	* math/Versions (libm): Add GLIBC_2.23.
	* math/lgamma-compat.h: New file.
	* math/test-signgam-main.c: Likewise.
	* math/test-signgam-uchar-init-static.c: Likewise.
	* math/test-signgam-uchar-init.c: Likewise.
	* math/test-signgam-uchar-static.c: Likewise.
	* math/test-signgam-uchar.c: Likewise.
	* math/test-signgam-uint-init-static.c: Likewise.
	* math/test-signgam-uint-init.c: Likewise.
	* math/test-signgam-uint-static.c: Likewise.
	* math/test-signgam-uint.c: Likewise.
	* math/test-signgam-ullong-init-static.c: Likewise.
	* math/test-signgam-ullong-init.c: Likewise.
	* math/test-signgam-ullong-static.c: Likewise.
	* math/test-signgam-ullong.c: Likewise.
	* math/w_lgamma.c: Rename to w_lgamma_main.c and replace by
	wrapper of w_lgamma_main.c.
	* math/w_lgamma_compat.c: New file.
	* math/w_lgamma_compatf.c: Likewise.
	* math/w_lgamma_compatl.c: Likewise.
	* math/w_lgamma_main.c: New file.  Based on w_lgamma.c.  Include
	<lgamma-compat.h>.  Condition contents on [BUILD_LGAMMA].  Support
	defining compatibility symbols.
	(__lgamma): Change to LGFUNC (__lgamma).  Use CALL_LGAMMA.
	* math/w_lgammaf.c: Rename to w_lgammaf_main.c and replace by
	wrapper of w_lgammaf_main.c.
	* math/w_lgammaf_main.c: New file.  Based on w_lgammaf.c.  Include
	<lgamma-compat.h>.  Condition contents on [BUILD_LGAMMA].  Support
	defining compatibility symbols.
	(__lgammaf): Change to LGFUNC (__lgammaf).  Use CALL_LGAMMA.
	* math/w_lgammal.c: Rename to w_lgammal_main.c and replace by
	wrapper of w_lgammal_main.c.
	* math/w_lgammal_main.c: New file.  Based on w_lgammal.c.  Include
	<lgamma-compat.h>.  Condition contents on [BUILD_LGAMMA].  Support
	defining compatibility symbols.
	(__lgammal): Change to LGFUNC (__lgammal).  Use CALL_LGAMMA.
	* sysdeps/ia64/fpu/lgamma-compat.h: New file.
	* sysdeps/ia64/fpu/w_lgamma.c: Move to ....
	* sysdeps/ia64/fpu/w_lgamma_main.c: ...here.  Include
	<lgamma-compat.h>.
	(__ieee754_lgamma): Change to LGFUNC (lgamma).  Use CALL_LGAMMA.
	(__ieee754_gamma): Define as alias.
	* sysdeps/ia64/fpu/w_lgammaf.c: Move to ....
	* sysdeps/ia64/fpu/w_lgammaf_main.c: ...here.  Include
	<lgamma-compat.h>.
	(__ieee754_lgammaf): Change to LGFUNC (lgammaf).  Use CALL_LGAMMA.
	(__ieee754_gammaf): Define as alias.
	* sysdeps/ia64/fpu/w_lgammal.c: Move to ....
	* sysdeps/ia64/fpu/w_lgammal_main.c: ...here.  Include
	<lgamma-compat.h>.
	(__ieee754_lgammal): Change to LGFUNC (lgammal).  Use CALL_LGAMMA.
	(__ieee754_gammal): Define as alias.
	* sysdeps/ieee754/ldbl-opt/w_lgamma.c: Move to ....
	* sysdeps/ieee754/ldbl-opt/w_lgamma_compat.c: ...here.  Include
	<math/w_lgamma_compat.c>.
	[LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)] (__lgammal_dbl_compat):
	Define as alias of __lgamma_compat and use in defining lgammal.
	* sysdeps/ieee754/ldbl-opt/w_lgammal.c: Move to ....
	* sysdeps/ieee754/ldbl-opt/w_lgamma_compatl.c: ...here.  Include
	<math/lgamma-compat.h> and <math/w_lgamma_compatl.c>.
	(USE_AS_COMPAT): New macro.
	(LGAMMA_OLD_VER): Undefine and redefine.
	(lgammal): Do not define here.
	(gammal): Only define here if [GAMMA_ALIAS].
	* conform/linknamespace.pl (@whitelist): Remove signgam.
	* sysdeps/nacl/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
 2015-11-20 22:49:59 +00:00
Wilco Dijkstra
d81f90ccd0 This patch renames all uses of __isinf*, __isnan*, __finite* and __signbit* to use standard C99 macros. This has no effect on generated code. 2015-06-03 15:41:36 +01:00
Ulrich Drepper
0ac5ae2335 Optimize libm 
libm is now somewhat integrated with gcc's -ffinite-math-only option
and lots of the wrapper functions have been optimized.
 2011-10-12 11:27:51 -04:00
Ulrich Drepper
9277c06437 Use private math_private.h in files in math/ 2011-10-08 05:16:04 -04:00
Ulrich Drepper
9d13fb2413 Moved to csu/errno-loc.c. 2005-12-14 15:06:39 +00:00
Ulrich Drepper
a334319f65 (CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4. 2004-12-22 20:10:10 +00:00
Jakub Jelinek
0ecb606cb6 2.5-18.1 2007-07-12 18:26:36 +00:00
Ulrich Drepper
e275093526 Update. 
* math/w_acos.c: Move to ...
	* sysdeps/generic/w_acos.c: ...here.  New file.
	* math/w_acosf.c: Move to ...
	* sysdeps/generic/w_acosf.c: ...here.  New file.
	* math/w_acosh.c: Move to ...
	* sysdeps/generic/w_acosh.c: ...here.  New file.
	* math/w_acoshf.c: Move to ...
	* sysdeps/generic/w_acoshf.c: ...here.  New file.
	* math/w_acoshl.c: Move to ...
	* sysdeps/generic/w_acoshl.c: ...here.  New file.
	* math/w_acosl.c: Move to ...
	* sysdeps/generic/w_acosl.c: ...here.  New file.
	* math/w_asin.c: Move to ...
	* sysdeps/generic/w_asin.c: ...here.  New file.
	* math/w_asinf.c: Move to ...
	* sysdeps/generic/w_asinf.c: ...here.  New file.
	* math/w_asinl.c: Move to ...
	* sysdeps/generic/w_asinl.c: ...here.  New file.
	* math/w_atan2.c: Move to ...
	* sysdeps/generic/w_atan2.c: ...here.  New file.
	* math/w_atan2f.c: Move to ...
	* sysdeps/generic/w_atan2f.c: ...here.  New file.
	* math/w_atan2l.c: Move to ...
	* sysdeps/generic/w_atan2l.c: ...here.  New file.
	* math/w_atanh.c: Move to ...
	* sysdeps/generic/w_atanh.c: ...here.  New file.
	* math/w_atanhf.c: Move to ...
	* sysdeps/generic/w_atanhf.c: ...here.  New file.
	* math/w_atanhl.c: Move to ...
	* sysdeps/generic/w_atanhl.c: ...here.  New file.
	* math/w_cosh.c: Move to ...
	* sysdeps/generic/w_cosh.c: ...here.  New file.
	* math/w_coshf.c: Move to ...
	* sysdeps/generic/w_coshf.c: ...here.  New file.
	* math/w_coshl.c: Move to ...
	* sysdeps/generic/w_coshl.c: ...here.  New file.
	* math/w_drem.c: Move to ...
	* sysdeps/generic/w_drem.c: ...here.  New file.
	* math/w_dremf.c: Move to ...
	* sysdeps/generic/w_dremf.c: ...here.  New file.
	* math/w_dreml.c: Move to ...
	* sysdeps/generic/w_dreml.c: ...here.  New file.
	* math/w_exp10.c: Move to ...
	* sysdeps/generic/w_exp10.c: ...here.  New file.
	* math/w_exp10f.c: Move to ...
	* sysdeps/generic/w_exp10f.c: ...here.  New file.
	* math/w_exp10l.c: Move to ...
	* sysdeps/generic/w_exp10l.c: ...here.  New file.
	* math/w_exp2.c: Move to ...
	* sysdeps/generic/w_exp2.c: ...here.  New file.
	* math/w_exp2f.c: Move to ...
	* sysdeps/generic/w_exp2f.c: ...here.  New file.
	* math/w_exp2l.c: Move to ...
	* sysdeps/generic/w_exp2l.c: ...here.  New file.
	* math/w_fmod.c: Move to ...
	* sysdeps/generic/w_fmod.c: ...here.  New file.
	* math/w_fmodf.c: Move to ...
	* sysdeps/generic/w_fmodf.c: ...here.  New file.
	* math/w_fmodl.c: Move to ...
	* sysdeps/generic/w_fmodl.c: ...here.  New file.
	* math/w_hypot.c: Move to ...
	* sysdeps/generic/w_hypot.c: ...here.  New file.
	* math/w_hypotf.c: Move to ...
	* sysdeps/generic/w_hypotf.c: ...here.  New file.
	* math/w_hypotl.c: Move to ...
	* sysdeps/generic/w_hypotl.c: ...here.  New file.
	* math/w_j0.c: Move to ...
	* sysdeps/generic/w_j0.c: ...here.  New file.
	* math/w_j0f.c: Move to ...
	* sysdeps/generic/w_j0f.c: ...here.  New file.
	* math/w_j0l.c: Move to ...
	* sysdeps/generic/w_j0l.c: ...here.  New file.
	* math/w_j1.c: Move to ...
	* sysdeps/generic/w_j1.c: ...here.  New file.
	* math/w_j1f.c: Move to ...
	* sysdeps/generic/w_j1f.c: ...here.  New file.
	* math/w_j1l.c: Move to ...
	* sysdeps/generic/w_j1l.c: ...here.  New file.
	* math/w_jn.c: Move to ...
	* sysdeps/generic/w_jn.c: ...here.  New file.
	* math/w_jnf.c: Move to ...
	* sysdeps/generic/w_jnf.c: ...here.  New file.
	* math/w_jnl.c: Move to ...
	* sysdeps/generic/w_jnl.c: ...here.  New file.
	* math/w_lgamma.c: Move to ...
	* sysdeps/generic/w_lgamma.c: ...here.  New file.
	* math/w_lgammaf.c: Move to ...
	* sysdeps/generic/w_lgammaf.c: ...here.  New file.
	* math/w_lgammaf_r.c: Move to ...
	* sysdeps/generic/w_lgammaf_r.c: ...here.  New file.
	* math/w_lgammal.c: Move to ...
	* sysdeps/generic/w_lgammal.c: ...here.  New file.
	* math/w_lgammal_r.c: Move to ...
	* sysdeps/generic/w_lgammal_r.c: ...here.  New file.
	* math/w_lgamma_r.c: Move to ...
	* sysdeps/generic/w_lgamma_r.c: ...here.  New file.
	* math/w_log10.c: Move to ...
	* sysdeps/generic/w_log10.c: ...here.  New file.
	* math/w_log10f.c: Move to ...
	* sysdeps/generic/w_log10f.c: ...here.  New file.
	* math/w_log10l.c: Move to ...
	* sysdeps/generic/w_log10l.c: ...here.  New file.
	* math/w_log.c: Move to ...
	* sysdeps/generic/w_log.c: ...here.  New file.
	* math/w_logf.c: Move to ...
	* sysdeps/generic/w_logf.c: ...here.  New file.
	* math/w_logl.c: Move to ...
	* sysdeps/generic/w_logl.c: ...here.  New file.
	* math/w_pow.c: Move to ...
	* sysdeps/generic/w_pow.c: ...here.  New file.
	* math/w_powf.c: Move to ...
	* sysdeps/generic/w_powf.c: ...here.  New file.
	* math/w_powl.c: Move to ...
	* sysdeps/generic/w_powl.c: ...here.  New file.
	* math/w_remainder.c: Move to ...
	* sysdeps/generic/w_remainder.c: ...here.  New file.
	* math/w_remainderf.c: Move to ...
	* sysdeps/generic/w_remainderf.c: ...here.  New file.
	* math/w_remainderl.c: Move to ...
	* sysdeps/generic/w_remainderl.c: ...here.  New file.
	* math/w_scalb.c: Move to ...
	* sysdeps/generic/w_scalb.c: ...here.  New file.
	* math/w_scalbf.c: Move to ...
	* sysdeps/generic/w_scalbf.c: ...here.  New file.
	* math/w_scalbl.c: Move to ...
	* sysdeps/generic/w_scalbl.c: ...here.  New file.
	* math/w_sinh.c: Move to ...
	* sysdeps/generic/w_sinh.c: ...here.  New file.
	* math/w_sinhf.c: Move to ...
	* sysdeps/generic/w_sinhf.c: ...here.  New file.
	* math/w_sinhl.c: Move to ...
	* sysdeps/generic/w_sinhl.c: ...here.  New file.
	* math/w_sqrtl.c: Move to ...
	* sysdeps/generic/w_sqrtl.c: ...here.  New file.
	* math/w_tgamma.c: Move to ...
	* sysdeps/generic/w_tgamma.c: ...here.  New file.
	* math/w_tgammaf.c: Move to ...
	* sysdeps/generic/w_tgammaf.c: ...here.  New file.
	* math/w_tgammal.c: Move to ...
	* sysdeps/generic/w_tgammal.c: ...here.  New file.
 2001-02-17 01:47:54 +00:00
Ulrich Drepper
ec751a23c0 Update. 
1999-10-31  Ulrich Drepper  <drepper@cygnus.com>

	* includes/features.h: Replace __USE_ISOC9X by __USE_ISOC99 and also
	recognize _ISOC99_SOURCE.
	* libio/stdio.h: Likewise.
	* math/math.h: Likewise.
	* math/bits/mathcalls.h: Likewise.
	* math/stdio.h: Likewise.
	* stdlib/stdlib.h: Likewise.
	* sysdeps/alpha/fpu/bits/mathdef.h: Likewise.
	* sysdeps/alpha/fpu/bits/mathinline.h: Likewise.
	* sysdeps/arm/bits/huge_val.h: Likewise.
	* sysdeps/generic/bits/mathdef.h: Likewise.
	* sysdeps/i386/bits/huge_val.h: Likewise.
	* sysdeps/i386/fpu/bits/mathdef.h: Likewise.
	* sysdeps/i386/fpu/bits/mathinline.h: Likewise.
	* sysdeps/ieee754/bits/huge_val.h: Likewise.
	* sysdeps/m68k/bits/huge_val.h: Likewise.
	* sysdeps/m68k/fpu/bits/mathdef.h: Likewise.
	* sysdeps/m68k/fpu/bits/mathinline.h: Likewise.
	* sysdeps/powerpc/bits/mathdef.h: Likewise.
	* sysdeps/powerpc/bits/mathinline.h: Likewise.
	* sysdeps/sparc/fpu/bits/mathdef.h: Likewise.
	* sysdeps/sparc/fpu/bits/mathinline.h: Likewise.
	* sysdeps/sparc/sparc32/fpu/bits/huge_val.h: Likewise.
	* wcsmbs/wchar.h: Likewise.

	* sysdeps/powerpc/bits/mathdef.h: Moved to...
	* sysdeps/powerpc/fpu/bits/mathdef.h: ...here.
	* sysdeps/powerpc/bits/mathinline.h: Moved to...
	* sysdeps/powerpc/fpu/bits/mathinline.h: ...here.

1999-10-31  Andreas Jaeger  <aj@suse.de>

	* manual/math.texi (Errors in Math Functions): Correct TeX code.

1999-10-31  Andreas Jaeger  <aj@suse.de>

	* math/libm-test.inc:  Change comments to use ISO C99 instead of
	ISO C9x.
	* math/w_lgamma.c: Likewise.
	* math/w_lgammaf.c: Likewise.
	* math/w_lgammal.c: Likewise.
	* math/test-fenv.c: Likewise.
	* sysdeps/ieee754/ldbl-96/printf_fphex.c: Likewise.
	* sysdeps/ieee754/ldbl-128/printf_fphex.c: Likewise.
	* sysdeps/generic/printf_fphex.c: Likewise.

1999-10-31  Andreas Jaeger  <aj@suse.de>

	* manual/arith.texi (Parsing of Floats): Remove C from ISO C comment.

	* manual/math.texi: Change ISO C9x to ISO C99.
	* manual/startup.texi: Likewise.
	* manual/stdio.texi: Likewise.

1999-10-31  Andreas Jaeger  <aj@suse.de>

	* manual/arith.texi: Change ISO C9x to ISO C99.
	* manual/time.texi (Low-Level Time String Parsing): Likewise.
 1999-10-31 17:37:43 +00:00
Ulrich Drepper
abfbdde177 Update. 1999-07-14 00:54:57 +00:00