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# isinf.m4 serial 2
dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_ISINF],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare isinf.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS([isinf], , , [#include <math.h>])
if test "$ac_cv_have_decl_isinf" = yes; then
gl_CHECK_MATH_LIB([ISINF_LIBM], [x = isinf (x);])
if test "$ISINF_LIBM" != missing; then
dnl Test whether isinf() on 'long double' works.
gl_ISINFL_WORKS
case "$gl_cv_func_isinfl_works" in
*yes) ;;
*) ISINF_LIBM=missing;;
esac
fi
fi
if test "$ac_cv_have_decl_isinf" != yes ||
test "$ISINF_LIBM" = missing; then
REPLACE_ISINF=1
AC_LIBOBJ([isinf])
ISINF_LIBM=
fi
AC_SUBST([REPLACE_ISINF])
AC_SUBST([ISINF_LIBM])
])
dnl Test whether isinf() correctly returns false for LDBL_MAX.
AC_DEFUN([gl_ISINFL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([gl_BIGENDIAN])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether isinf(long double) works], [gl_cv_func_isinfl_works],
[
AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <float.h>
#include <math.h>]],
[[return !!isinf(LDBL_MAX);]])],
[gl_cv_func_isinfl_works=yes],
[gl_cv_func_isinfl_works=no],
[gl_cv_func_isinfl_works="guessing no"])
])
])
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