Re: standards/40695: C99 violation: Macro NAN in /usr/include/math.h in not constant.

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR standards/40695; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: standards/40695: C99 violation: Macro NAN in /usr/include/math.h 
in not constant.
Date: Thu, 19 Feb 2009 23:10:44 +0100

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 This should fix it (not tested yet), plus a warn reference for __nanf.
 
 Martin
 
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 Index: math.h
 ===================================================================
 RCS file: /cvsroot/src/include/math.h,v
 retrieving revision 1.47
 diff -c -u -r1.47 math.h
 --- math.h     25 Apr 2008 21:20:57 -0000      1.47
 +++ math.h     19 Feb 2009 22:09:41 -0000
 @@ -87,8 +87,12 @@
  
  /* 7.12#5 NAN: a quiet NaN, if supported */
  #ifdef __HAVE_NANF
 +#if __GNUC_PREREQ__(3,3)
 +#define       NAN     __builtin_nanf("")
 +#else
  extern const union __float_u __nanf;
  #define       NAN             __nanf.__val
 +#endif
  #endif /* __HAVE_NANF */
  
  /* 7.12#6 number classification macros */
 
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