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 b191c40..5132b96 100644 (file)
--- 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 ae6821d..6276c06 100644 (file)
--- 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)