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X-Recipient:	djgpp-workers AT delorie DOT com
Message-ID:	<48198F50.9050604@iki.fi>
Date:	Thu, 01 May 2008 12:37:20 +0300
From:	Andris Pavenis <andris DOT pavenis AT iki DOT fi>
User-Agent:	Thunderbird 2.0.0.12 (X11/20080226)
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To:	djgpp-workers AT delorie DOT com
Subject:	gcc-4.3.0 strict aliasing warnings from ieeefp.h
Reply-To:	djgpp-workers AT delorie DOT com

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I'm getting warnings about dereferencing type punned pointer when
building libm with gcc-4.3.0. Attached patch fixes the problem

Andris



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Index: ieeefp.h
===================================================================
RCS file: /cvs/djgpp/djgpp/include/ieeefp.h,v
retrieving revision 1.2
diff -u -r1.2 ieeefp.h
--- ieeefp.h	11 Dec 2007 07:27:40 -0000	1.2
+++ ieeefp.h	1 May 2008 09:30:39 -0000
@@ -72,14 +72,20 @@
 #define __IEEE_DBL_NAN_EXP 0x7ff
 #define __IEEE_FLT_NAN_EXP 0xff
 
+inline long __dj_float_content_as_long(float x)
+{
+  union { long long_val; float float_val; } tmp;
+  tmp.float_val = x;
+  return tmp.long_val;
+}
 
-#define isnanf(x) (((*(long *)(void *)&(x) & 0x7f800000L)==0x7f800000L) && \
-		   ((*(long *)(void *)&(x) & 0x007fffffL)!=0000000000L))
+#define isnanf(x) (((__dj_float_content_as_long(x) & 0x7f800000L)==0x7f800000L) && \
+		   ((__dj_float_content_as_long(x) & 0x007fffffL)!=0000000000L))
 
-#define isinff(x) (((*(long *)(void *)&(x) & 0x7f800000L)==0x7f800000L) && \
-		   ((*(long *)(void *)&(x) & 0x007fffffL)==0000000000L))
+#define isinff(x) (((__dj_float_content_as_long(x) & 0x7f800000L)==0x7f800000L) && \
+		   ((__dj_float_content_as_long(x) & 0x007fffffL)==0000000000L))
 
-#define finitef(x) (((*(long *)(void *)&(x) & 0x7f800000L)!=0x7f800000L))
+#define finitef(x) (((__dj_float_content_as_long(x) & 0x7f800000L)!=0x7f800000L))
 
 #ifdef __cplusplus
 }

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