Giles Robertson writes:
>
> Can someone apply the following diff on
> simgear/sound/soundmgr_openal.cxx:
>
> 45,47d44
> < #if defined(__MINGW32__)
> < #define isnan(x) _isnan(x)
> < #endif
> 63a61,63
> > #if defined(__MINGW32__)
> > #define isnan(x) _isnan(x)
> > #endif
>
> This shifts the isnan definition after the other includes, so isnan
> isn't undefined, and allows SimGear to compile clean with MingW/MSYS.
Hmm... not so fast
This needs a __GNUC__ version check
to wit ...
<696> tmp
$ g++ --version
g++.exe (GCC) 3.4.2 (mingw-special)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
<697> tmp
$ g++ -o isnan isnan.cxx
<698> tmp
$ ./isnan
Bad Number = 1.#QNAN
and
<561> tmp
$ g++ -mno-cygwin -o isnan isnan.cxx
<562> tmp
$ ./isnan
Bad Number = 1.#QNAN
<563> tmp
$ g++ --version
g++ (GCC) 3.3.3 (cygwin special)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
===== isnan.cxx =====
#include <math.h>
#include <iostream>
using namespace std;
#define my_make_dnan(x) (((unsigned int *) &x)[0] = 0xffffffff, ((unsigned int
*) &x)[1] = 0x7fffffff)
void print_num( double x)
{
if ( isnan(x) )
cout << "Bad Number = " << x << endl;
else
cout << "Number = " << x << endl;
}
int main(int argc, char **argv)
{
double bad_num;
my_make_dnan(bad_num);
print_num ( bad_num );
return 0;
}
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