Andreas Schwab <[EMAIL PROTECTED]> writes:
> Why not just use AC_HAVE_FUNCS(isinf)? IIUC this is part of a configure
> script, although whether it is autoconf generated is not clear so far.
Though I don't know the why, rrdtool-1.2.10/configure.ac has the
following macro.
dnl HP-UX 11.00 does not have finite but does have isfinite as a macro so we
need
dnl actual code to check if this works
AC_CHECK_FUNCS(fpclassify, ,
[AC_MSG_CHECKING(for fpclassify with <math.h>)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0;
fpclassify(f)]])],[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FPCLASSIFY)],[AC_MSG_RESULT(no)])])
AC_CHECK_FUNCS(finite, ,
[AC_CHECK_FUNCS(isfinite, ,
[AC_MSG_CHECKING(for isfinite with <math.h>)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0;
isfinite(f)]])],[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ISFINITE)],[AC_MSG_RESULT(no)])])])
AC_CHECK_FUNCS(isinf, ,
[AC_MSG_CHECKING(for isinf with <math.h>)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0; int
x = isinf(f)]])],[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ISINF)],[AC_MSG_RESULT(no)])])
--
Hiroshi Fujishima
