isinf is a macro on HP-UX

isinf is a macro on HP-UX

[Andreas Vögele]

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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().


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Index: configure.in
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/configure.in,v
retrieving revision 1.240
diff -u -r1.240 configure.in
--- configure.in	21 Apr 2004 23:37:22 -0000	1.240
+++ configure.in	23 May 2004 15:16:03 -0000
@@ -861,7 +861,17 @@
 #                                older systems
 #   sincos - GLIBC extension
 #
-AC_CHECK_FUNCS(asinh acosh atanh copysign finite isinf isnan sincos trunc)
+AC_CHECK_FUNCS(asinh acosh atanh copysign finite isnan sincos trunc)
+
+# On HP-UX 11, isinf() is a macro.  We must make sure that math.h is
+# included when checking for isinf().
+AC_MSG_CHECKING([for isinf])
+AC_LINK_IFELSE([AC_LANG_PROGRAM(
+ [[#include <math.h>]],
+ [[isinf (0.0);]])],
+ [AC_MSG_RESULT([yes])
+  AC_DEFINE(HAVE_ISINF, 1, [Define to 1 if you have the `isinf' function/macro.])],
+ [AC_MSG_RESULT([no])])
 
 # When testing for the presence of alloca, we need to add alloca.o
 # explicitly to LIBOBJS to make sure that it is translated to

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Re: isinf is a macro on HP-UX

[Kevin Ryde]

Andreas Vögele <voegelas@gmx.net> writes:
>
> isinf is a macro on HP-UX. Currently, configure.in uses
> AC_CHECK_FUNCS, which checks for functions only, to check for
> isinf.

It's tempting to look only for an isinf macro in the C file.  I wonder
if any systems have only a function version.

> I've attached a patch that replaces the current test with a
> test that includes math.h.

I guess the alternative is to leave configure alone and supplement the
result of the test with #ifdef isinf in the C file.  Though I suppose
it's a bit disconcerting to see "no" in configure when one's libc docs
say isinf exists.


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Re: isinf is a macro on HP-UX

[Kevin Ryde]

Andreas Vögele <voegelas@gmx.net> writes:
>
> 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.

Thanks, I made some changes along these lines (at long last).


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