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# isnanf.m4
# serial 22
dnl Copyright (C) 2007-2025 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.
dnl This file is offered as-is, without any warranty.
dnl Check how to get or define isnanf().
AC_DEFUN([gl_FUNC_ISNANF],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
ISNANF_LIBM=
gl_HAVE_ISNANF_NO_LIBM
if test $gl_cv_func_isnanf_no_libm = no; then
gl_HAVE_ISNANF_IN_LIBM
if test $gl_cv_func_isnanf_in_libm = yes; then
ISNANF_LIBM=-lm
fi
fi
dnl The variable gl_func_isnanf set here is used by isnan.m4.
if test $gl_cv_func_isnanf_no_libm = yes || test -n "$ISNANF_LIBM"; then
saved_LIBS="$LIBS"
LIBS="$LIBS $ISNANF_LIBM"
gl_ISNANF_WORKS
LIBS="$saved_LIBS"
case "$gl_cv_func_isnanf_works" in
*yes) gl_func_isnanf=yes ;;
*) gl_func_isnanf=no; ISNANF_LIBM= ;;
esac
else
gl_func_isnanf=no
fi
if test $gl_func_isnanf != yes; then
HAVE_ISNANF=0
fi
AC_SUBST([ISNANF_LIBM])
])
dnl Check how to get or define isnanf() without linking with libm.
AC_DEFUN([gl_FUNC_ISNANF_NO_LIBM],
[
gl_HAVE_ISNANF_NO_LIBM
if test $gl_cv_func_isnanf_no_libm = yes; then
gl_ISNANF_WORKS
fi
if test $gl_cv_func_isnanf_no_libm = yes \
&& { case "$gl_cv_func_isnanf_works" in
*yes) true;;
*) false;;
esac
}; then
gl_func_isnanf_no_libm=yes
AC_DEFINE([HAVE_ISNANF_IN_LIBC], [1],
[Define if the isnan(float) function is available in libc.])
else
gl_func_isnanf_no_libm=no
fi
])
dnl Prerequisites of replacement isnanf definition. It does not need -lm.
AC_DEFUN([gl_PREREQ_ISNANF],
[
gl_FLOAT_EXPONENT_LOCATION
])
dnl Test whether isnanf() can be used without libm.
AC_DEFUN([gl_HAVE_ISNANF_NO_LIBM],
[
AC_CACHE_CHECK([whether isnan(float) can be used without linking with libm],
[gl_cv_func_isnanf_no_libm],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <math.h>
#if (__GNUC__ >= 4) || (__clang_major__ >= 4)
# undef isnanf
# define isnanf(x) __builtin_isnan ((float)(x))
#elif defined isnan
# undef isnanf
# define isnanf(x) isnan ((float)(x))
#endif
float x;]],
[[return isnanf (x);]])],
[gl_cv_func_isnanf_no_libm=yes],
[gl_cv_func_isnanf_no_libm=no])
])
])
dnl Test whether isnanf() can be used with libm.
AC_DEFUN([gl_HAVE_ISNANF_IN_LIBM],
[
AC_CACHE_CHECK([whether isnan(float) can be used with libm],
[gl_cv_func_isnanf_in_libm],
[
saved_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <math.h>
#if (__GNUC__ >= 4) || (__clang_major__ >= 4)
# undef isnanf
# define isnanf(x) __builtin_isnan ((float)(x))
#elif defined isnan
# undef isnanf
# define isnanf(x) isnan ((float)(x))
#endif
float x;]],
[[return isnanf (x);]])],
[gl_cv_func_isnanf_in_libm=yes],
[gl_cv_func_isnanf_in_libm=no])
LIBS="$saved_LIBS"
])
])
dnl Test whether isnanf() rejects Infinity (this fails on Solaris 2.5.1).
AC_DEFUN([gl_ISNANF_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_REQUIRE([gl_FLOAT_EXPONENT_LOCATION])
AC_CACHE_CHECK([whether isnan(float) works], [gl_cv_func_isnanf_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
#if (__GNUC__ >= 4) || (__clang_major__ >= 4)
# undef isnanf
# define isnanf(x) __builtin_isnan ((float)(x))
#elif defined isnan
# undef isnanf
# define isnanf(x) isnan ((float)(x))
#endif
int main()
{
int result = 0;
if (isnanf (1.0f / 0.0f))
result |= 1;
return result;
}]])],
[gl_cv_func_isnanf_works=yes],
[gl_cv_func_isnanf_works=no],
[case "$host_os" in
solaris*) gl_cv_func_isnanf_works="guessing no" ;;
mingw* | windows*) # Guess yes on mingw, no on MSVC.
AC_EGREP_CPP([Known], [
#ifdef __MINGW32__
Known
#endif
],
[gl_cv_func_isnanf_works="guessing yes"],
[gl_cv_func_isnanf_works="guessing no"])
;;
*) gl_cv_func_isnanf_works="guessing yes" ;;
esac
])
])
])
|
