isinf is a macro on HP-UX

[Andreas V�gele]

isinf is a macro on HP-UX. Currently, configure.in uses AC_CHECK_FUNCS, which checks for functions only, to check for isinf. I've attached a patch that replaces the current test with a test that includes math.h.

The HP-UX manual page says "The ISO/ANSI C committee has approved the isinf() macro for inclusion in the C9X draft standard. [...] The isinf() macro replaces the isinf() and isinff() functions, which are obsolete and are no longer supported."

It seems that C99 defines the following macros: fpclassify(), isfinite(), isinf(), isnan(), isnormal(), signbit().

configure.in.diff
Description: Binary data

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