Fix soft-float ldbl-128ibm atan2l signs of zero results (bug 16390).

This patch fixes bug 16390, incorrect signs of zero results from
ldbl-128ibm atan2l, soft-float only.  The problem is a longstanding
GCC bug with fabsl not being correct for signed zero for soft float,
and the fix is using -fno-builtin-fabsl as a workaround, as already
done for various other source files.  Tested powerpc-nofpu.

	* sysdeps/powerpc/nofpu/Makefile [$(subdir) = math]
	(CFLAGS-e_atan2l.c): Use -fno-builtin-fabsl.

diff --git a/ChangeLog b/ChangeLog
index 102967904fd2c586841ae641f33815af2345eb91..0e6850d43a1d762ea776777823b1a4f304022d89 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2014-01-03  Joseph Myers  <joseph@codesourcery.com>
+
+       [BZ #16390]
+       * sysdeps/powerpc/nofpu/Makefile [$(subdir) = math]
+       (CFLAGS-e_atan2l.c): Use -fno-builtin-fabsl.
+
 2014-01-03  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
        * sysdeps/powerpc/powerpc64/multiarch/strcasecmp-power7.S: Remove

diff --git a/NEWS b/NEWS
index e0ea97aa0e1f86d369b4ecf9f6f2c71112627836..7757c32ab797519e7792c788fdf54d446bd9b7fb 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -24,7 +24,7 @@ Version 2.19
   16143, 16144, 16146, 16150, 16151, 16153, 16167, 16172, 16195, 16214,
   16245, 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337,
   16338, 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16384, 16385,
-  16386.
+  16386, 16390.
 
 * Slovenian translations for glibc messages have been contributed by the
   Translation Project's Slovenian team of translators.

diff --git a/sysdeps/powerpc/nofpu/Makefile b/sysdeps/powerpc/nofpu/Makefile
index 9de7c437471c4957f0de0dc1ae2e7ffc84ab76c2..99761ef7f0078c5554195e228bc6befe8c1789a2 100644 (file)
--- a/sysdeps/powerpc/nofpu/Makefile
+++ b/sysdeps/powerpc/nofpu/Makefile
@@ -15,6 +15,7 @@ CPPFLAGS += -I../soft-fp/
 # gcc-4.1.1 and may be too late for gcc-4.2.  So we need these flags
 # until the fix in a gcc release and glibc drops support for earlier
 # versions of gcc.
+CFLAGS-e_atan2l.c += -fno-builtin-fabsl
 CFLAGS-e_hypotl.c += -fno-builtin-fabsl
 CFLAGS-e_powl.c += -fno-builtin-fabsl
 CFLAGS-s_ccoshl.c += -fno-builtin-fabsl