From: Stan Shebs <stanshebs@google.com>
Date: Wed, 26 Aug 2015 23:10:00 +0000 (-0700)
Subject: Disable uninitialized warning with GCC 4.8
X-Git-Tag: glibc-2.23~549
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fff289f358ee26bb4cdd70f72f4b1b0e1a7d07a1;p=thirdparty%2Fglibc.git

Disable uninitialized warning with GCC 4.8

As with other spots in the code, GCC 4.8 unnecessarily complains about
an uninitialized variable in tanl calcs, so this patch disables.  With
it, the library and sees the usual set of test passes.

	* sysdeps/ieee754/ldbl-96/k_tanl.c: Include <libc-internal.h>.
	(__kernel_tanl): Ignore uninitialized warnings around use of SIGN.
---

diff --git a/ChangeLog b/ChangeLog
index b191c408a43..5132b96807d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-26  Stan Shebs  <stanshebs@google.com>
+
+	* sysdeps/ieee754/ldbl-96/k_tanl.c: Include <libc-internal.h>.
+	(__kernel_tanl): Ignore uninitialized warnings around use of SIGN.
+
 2015-08-26  Carlos Eduardo Seo  <cseo@linux.vnet.ibm.com>
 
 	* sysdeps/powerpc/bits/hwcap.h: Add PPC_FEATURE2_HTM_NOSC.
diff --git a/sysdeps/ieee754/ldbl-96/k_tanl.c b/sysdeps/ieee754/ldbl-96/k_tanl.c
index ae6821d9844..6276c06e710 100644
--- a/sysdeps/ieee754/ldbl-96/k_tanl.c
+++ b/sysdeps/ieee754/ldbl-96/k_tanl.c
@@ -57,6 +57,7 @@
  */
 
 #include <float.h>
+#include <libc-internal.h>
 #include <math.h>
 #include <math_private.h>
 static const long double
@@ -136,8 +137,19 @@ __kernel_tanl (long double x, long double y, int iy)
     {
       v = (long double) iy;
       w = (v - 2.0 * (x - (w * w / (w + v) - r)));
+      /* SIGN is set for arguments that reach this code, but not
+        otherwise, resulting in warnings that it may be used
+        uninitialized although in the cases where it is used it has
+        always been set.  */
+      DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (4, 7)
+      DIAG_IGNORE_NEEDS_COMMENT (4.8, "-Wmaybe-uninitialized");
+#else
+      DIAG_IGNORE_NEEDS_COMMENT (4.8, "-Wuninitialized");
+#endif
       if (sign < 0)
 	w = -w;
+      DIAG_POP_NEEDS_COMMENT;
       return w;
     }
   if (iy == 1)