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Date:	Mon, 23 Mar 2009 21:43:06 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: strtold, isnormal
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On Mar 23 20:19, Andy Koppe wrote:
> >> Oh, btw., the isnormal macro exists in math.h.
> >
> > Thanks.  But for some reason it's not getting picked up:
> >
> > gcc -c -I. -I/usr/local/include -I/home/reynolds-gregg/include
> > -I/usr/local/include -DNDEBUG -D_GNU_SOURCE=1 -D_REENTRANT
> > -D__EXTENSIONS__ -D_TC_PREFIX="\"/usr/local\""
> > -D_TC_INCLUDEDIR="\"/usr/local/include\""
> > -D_TC_LIBDIR="\"/usr/local/lib\"" -D_TC_BINDIR="\"/usr/local/bin\""
> > -D_TC_LIBEXECDIR="\"/usr/local/libexec\""
> > -D_TC_APPINC="\"-I/usr/local/include\""
> > -D_TC_APPLIBS="\"-L/usr/local/lib -ltokyocabinet -lbz2 -lz -lpthread
> > -lm -lc \"" -I/usr/include -std=c99 -Wall -fPIC -fsigned-char -O2
> > tcutil.c
> >
> > result:
> >
> > tcutil.c:4948: warning: implicit declaration of function `isnormal'
> 
> isnormal() and a load of other things are guarded by
> '#if !defined(__STRICT_ANSI__)' in math.h, and __STRICT_ANSI__ does
> get defined for -std=c99.
> 
> It's definitely in the C99 standard though, so either the header is
> wrong or __STRICT_ANSI__ shouldn't be defined.

It's a bug in the math.h header which is fixed in CVS, so the patch
will be in Cygwin 1.7.  The old header guards the functions with

  #if !defined(__STRICT_ANSI__) || defined(__cplusplus)

The latest version of math.h guards them correctly with

  #if !defined(__STRICT_ANSI__) || defined(__cplusplus) || __STDC_VERSION__ >= 199901L

We don't update the 1.5.x release anymore, so I suggest either to
give Cygwin 1.7 a test, or to tweak your math.h locally for now.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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