[libpng16] Revert recent pngvalid.c changes and define FE_DIVBYZERO, etc.,

if not already defined.

ANNOUNCE

@@ -43,6 +43,9 @@ Version 1.6.14beta02 [September 18, 2014]
     at users.sourceforge.net").
 
 Version 1.6.14beta03 [September 18, 2014]
+  Define FE_DIVBYZERO, FE_INVALID, and FE_OVERFLOW in pngvalid.c if not
+    already defined.  Revert floating point exception handling to version
+    1.6.14beta01 behavior.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CHANGES

@@ -4996,6 +4996,9 @@ Version 1.6.14beta02 [September 18, 2014]
     at users.sourceforge.net").
 
 Version 1.6.14beta03 [September 18, 2014]
+  Define FE_DIVBYZERO, FE_INVALID, and FE_OVERFLOW in pngvalid.c if not
+    already defined.  Revert floating point exception handling to version
+    1.6.14beta01 behavior.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

contrib/libtests/pngvalid.c

 
 /* pngvalid.c - validate libpng by constructing then reading png files.
  *
- * Last changed in libpng 1.6.10 [March 6, 2014]
+ * Last changed in libpng 1.6.14 [(PENDING RELEASE)]
  * Copyright (c) 2014 Glenn Randers-Pehrson
  * Written by John Cunningham Bowler
  *
@@ -30,6 +30,20 @@
 #  include <config.h>
 #endif
 
+#ifdef HAVE_FEENABLEEXCEPT /* from config.h, if included */
+#  include <fenv.h>
+#endif
+
+#ifndef FE_DIVBYZERO
+#define FE_DIVBYZERO 0
+#endif
+#ifndef FE_INVALID
+#define FE_INVALID 0
+#endif
+#ifndef FE_OVERFLOW
+#define FE_OVERFLOW 0
+#endif
+
 /* Define the following to use this test against your installed libpng, rather
  * than the one being built here:
  */
@@ -39,13 +53,6 @@
 #  include "../../png.h"
 #endif
 
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-# ifdef HAVE_FEENABLEEXCEPT /* from config.h, if included */
-#   include <fenv.h>
-# endif
-#endif
-
-
 #ifdef PNG_ZLIB_HEADER
 #  include PNG_ZLIB_HEADER
 #else
@@ -9979,11 +9986,9 @@ static void signal_handler(int signum)
          pos = safecat(msg, sizeof msg, pos, "abort");
          break;
 
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
       case SIGFPE:
          pos = safecat(msg, sizeof msg, pos, "floating point exception");
          break;
-#endif
 
       case SIGILL:
          pos = safecat(msg, sizeof msg, pos, "illegal instruction");
@@ -10049,21 +10054,18 @@ int main(int argc, char **argv)
 
    /* Add appropriate signal handlers, just the ANSI specified ones: */
    signal(SIGABRT, signal_handler);
+   signal(SIGFPE, signal_handler);
    signal(SIGILL, signal_handler);
    signal(SIGINT, signal_handler);
    signal(SIGSEGV, signal_handler);
    signal(SIGTERM, signal_handler);
 
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-   signal(SIGFPE, signal_handler);
-
-# ifdef HAVE_FEENABLEEXCEPT
+#ifdef HAVE_FEENABLEEXCEPT
    /* Only required to enable FP exceptions on platforms where they start off
     * disabled; this is not necessary but if it is not done pngvalid will likely
     * end up ignoring FP conditions that other platforms fault.
     */
    feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
-# endif
 #endif
 
    modifier_init(&pm);