Problems compiling GSL on a Mac OS X

[Rodney Sparapani]

> Daniel T Konkle writes:
>> I'm in the process of trying to get the GSL libraries to compile & 
>> run on
>> an PowerMac G4 running Mac OS X 10.2.6
>> During compilation, I get this error message & I was hoping someone 
>> could
>> tell me what to do to fix this warning message.
>> /usr/include/architecture/ppc/math.h:106: warning: redefinition of 
>> macro isinf
>> ../config.h:192: warning: this is the location of the previous 
>> definition
>> /usr/include/architecture/ppc/math.h:111: warning: redefinition of 
>> macro isnan
>> ../config.h:196: warning: this is the location of the previous 
>> definition
>
> The configure script looks for isinf().  If it doesn't find it, it can
> get confused and tries to #define isinf(x) gsl_isinf(x).  Here is what
> is currently in configure.in:
>
> AC_TRY_COMPILE([#define isinf /* */
> #include <math.h>],[{}],[],[
>         AC_CHECK_FUNCS(isinf, ,[
>             AC_MSG_CHECKING([for isinf with <math.h>])
>             AC_TRY_LINK([#include <math.h>], [float f = 0.0; 
> isinf(f)],[
>                 AC_MSG_RESULT(yes)
>                 AC_DEFINE(HAVE_ISINF)],
>                 AC_MSG_RESULT(no))])])
>
> -- 
> Brian
>
I don't understand this.  Here's what /usr/include/math.h says:

#if defined (__ppc__)
#include "architecture/ppc/math.h"
#elif defined (__i386__)
#include "architecture/i386/math.h"
#else
#error Unknown architecture
#endif

Could it be that __ppc__ is not defined by autoconf/automake when you 
configure, but is defined when you make?