[Bug build/21314] Compile Error GCC 5.2.0 MIPS with -0s

["lordrasmus at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21314

--- Comment #2 from Ramin Seyed-Moussavi <lordrasmus at gmail dot com> ---
i had to modify the include
and then i had the same issue in another file

like this it works now


diff -ur glibc-2.25_vanilla/sysdeps/ieee754/dbl-64/s_log1p.c
glibc-2.25/sysdeps/ieee754/dbl-64/s_log1p.c
--- glibc-2.25_vanilla/sysdeps/ieee754/dbl-64/s_log1p.c 2017-02-05
16:28:43.000000000 +0100
+++ glibc-2.25/sysdeps/ieee754/dbl-64/s_log1p.c 2017-03-27 18:26:45.435936378
+0200
@@ -81,6 +81,7 @@
 #include <float.h>
 #include <math.h>
 #include <math_private.h>
+#include <libc-internal.h>

 static const double
   ln2_hi = 6.93147180369123816490e-01,  /* 3fe62e42 fee00000 */
@@ -191,5 +192,14 @@
   if (k == 0)
     return f - (hfsq - s * (hfsq + R));
   else
-    return k * ln2_hi - ((hfsq - (s * (hfsq + R) + (k * ln2_lo + c))) - f);
+    {
+      /* With GCC 5.2.0 when compiling with -Os on MIPS the compiler
+        warns that c might be used uninitialized.  This can't be true
+        because k must be 0 for c to be uninitialized and we handled
+        that computation earlier without using c.  */
+      DIAG_PUSH_NEEDS_COMMENT;
+      DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
+      return k * ln2_hi - ((hfsq - (s * (hfsq + R) + (k * ln2_lo + c))) - f);
+      DIAG_POP_NEEDS_COMMENT;
+    }
 }
diff -ur glibc-2.25_vanilla/sysdeps/ieee754/flt-32/s_log1pf.c
glibc-2.25/sysdeps/ieee754/flt-32/s_log1pf.c
--- glibc-2.25_vanilla/sysdeps/ieee754/flt-32/s_log1pf.c        2017-02-05
16:28:43.000000000 +0100
+++ glibc-2.25/sysdeps/ieee754/flt-32/s_log1pf.c        2017-03-27
18:27:20.947910242 +0200
@@ -16,6 +16,7 @@
 #include <float.h>
 #include <math.h>
 #include <math_private.h>
+#include <libc-internal.h>

 static const float
 ln2_hi =   6.9313812256e-01,   /* 0x3f317180 */
@@ -97,6 +98,17 @@
        s = f/((float)2.0+f);
        z = s*s;
        R = z*(Lp1+z*(Lp2+z*(Lp3+z*(Lp4+z*(Lp5+z*(Lp6+z*Lp7))))));
-       if(k==0) return f-(hfsq-s*(hfsq+R)); else
-                return k*ln2_hi-((hfsq-(s*(hfsq+R)+(k*ln2_lo+c)))-f);
+       if(k==0)
+         return f-(hfsq-s*(hfsq+R));
+       else
+         {
+      /* With GCC 5.2.0 when compiling with -Os on MIPS the compiler
+        warns that c might be used uninitialized.  This can't be true
+        because k must be 0 for c to be uninitialized and we handled
+        that computation earlier without using c.  */
+      DIAG_PUSH_NEEDS_COMMENT;
+      DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
+      return k*ln2_hi-((hfsq-(s*(hfsq+R)+(k*ln2_lo+c)))-f);
+      DIAG_POP_NEEDS_COMMENT;
+    }
 }

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