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> can you come up with a configure patch that would allow isinf to be
> detected on Solaris?
The plot thickens. I know squat about autoconf sorts of things so I
asked on the autoconf mailing list. Eric Drake responded (in part):
 The Python ACHECK_FUNCS test should be rewritten (with proper m4
 quoting) as:
 AC_CHECK_FUNCS([acosh asinh atanh expm1 finite log1p])
 AC_CHECK_DECLS([isinf, isnan], [], [], [[#include <math.h>]])
so I gave that a whirl. Whaddya know? isinf *really* isn't available,
at least not until C99 apparently. The AC_CHECK_DECLS macro generates
a conftest.c which looks like this:
 #include <math.h> 
 
 int 
 main () 
 { 
 #ifndef isinf 
 (void) isinf; 
 #endif 
 
 ; 
 return 0; 
 } 
which fails to compile/link on our Sol10 boxes. Turns out libm.so
doesn't export an _isinf symbol. The macro I found (in iso/math_c99.h)
doesn't expand in gcc -E output of the above code, so in my non-c99
environment I don't get to use isinf. Looks like your Py_IS_INFINITY
fix will be necessary. Eric also suggested using the gnu isinf and
isnan modules:
 http://git.savannah.gnu.org/gitweb/?
p=gnulib.git;a=blob;f=m4/isinf.m4;h=1b9e45a;hb=67461c3
I'll leave that for you to decide.
In any case, the above changes to AC_CHECK_FUNCS should probably be
made.
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