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Fix finite-math-only lgamma functions signgam setting (bug 19211).

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The lgamma inline functions in bits/math-finite.h do not set signgam
if __USE_ISOC99, even when other feature test macros mean a standard
such as XSI POSIX is selected for which it should be set.  (This is
essentially the opposite issue to bug 15421, the out-of-line versions
setting signgam even when they shouldn't.)

This patch fixes those functions to use __USE_MISC || __USE_XOPEN as
the condition for when to set signgam, since it's the condition for
when math.h declares signgam.  The legacy gamma* names are only
declared at all if __USE_MISC || __USE_XOPEN, so they just set signgam
unconditionally.

Tests for certain standards or not using _GNU_SOURCE cannot use
test-skeleton.c (this is a known issue noted on the wiki todo list).
Thus, the new tests that signgam remains not set in ISO C modes do not
use test-skeleton.c.  They also define _ISOMAC to avoid running into
declarations in the internal include/ headers that only work in
_GNU_SOURCE mode.

Tested for x86_64 and x86.

	[BZ #19211]
	* math/bits/math-finite.h (lgamma): Set signgam if [__USE_MISC ||
	__USE_XOPEN], not if [!__USE_ISOC99].
	(lgammaf): Likewise.
	(lgammal): Likewise.
	(gamma): Set signgam unconditionally, not if [!__USE_ISOC99].
	(gammaf): Likewise.
	(gammal): Likewise.
	* math/test-signgam-finite-c11.c: New file.
	* math/test-signgam-finite-c99.c: Likewise.
	* math/test-signgam-finite.c: Likewise.
	* math/Makefile (tests): Add test-signgam-finite,
	test-signgam-finite-c99 and test-signgam-finite-c11.
	(CFLAGS-test-signgam-finite.c): New variable.
	(CFLAGS-test-signgam-finite-c99.c): Likewise.
	(CFLAGS-test-signgam-finite-c11.c): Likewise.
This commit is contained in:
Joseph Myers
2015-11-05 21:23:07 +00:00
parent f248238cf4
commit 939fdd1c36
7 changed files with 164 additions and 26 deletions
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65
math/test-signgam-finite-c99.c Normal file
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/* Test lgamma functions do not set signgam for -ffinite-math-only for ISO C.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#undef _LIBC
#undef _GNU_SOURCE
#define _ISOMAC
#include <math.h>
#include <stdio.h>
int signgam;
#define RUN_TESTS(FUNC, TYPE) \
do \
{ \
volatile TYPE a, b, c __attribute__ ((unused)); \
a = 0.5; \
b = -0.5; \
signgam = 123; \
c = FUNC (a); \
if (signgam == 123) \
puts ("PASS: " #FUNC " (0.5) setting signgam"); \
else \
{ \
puts ("FAIL: " #FUNC " (0.5) setting signgam"); \
result = 1; \
} \
signgam = 123; \
c = FUNC (b); \
if (signgam == 123) \
puts ("PASS: " #FUNC " (0.5) setting signgam"); \
else \
{ \
puts ("FAIL: " #FUNC " (0.5) setting signgam"); \
result = 1; \
} \
} \
while (0)
int
main (void)
{
int result = 0;
RUN_TESTS (lgammaf, float);
RUN_TESTS (lgamma, double);
#ifndef NO_LONG_DOUBLE
RUN_TESTS (lgammal, long double);
#endif
return result;
}