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

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.

1 files changed, 17 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 3ee9f19cf8..9c78a11722 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,22 @@
 2015-11-05  Joseph Myers  <joseph@codesourcery.com>
 
+	[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.
+
 	[BZ #19212]
 	* include/features.h [(_XOPEN_SOURCE - 0) >= 500]: Change
 	conditional to [defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >=