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# remainder.m4 serial 10
dnl Copyright (C) 2012-2023 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_FUNC_REMAINDER],
[
m4_divert_text([DEFAULTS], [gl_remainder_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Test whether remainder() is declared. On IRIX 5.3 it is not declared.
AC_CHECK_DECL([remainder], , [HAVE_DECL_REMAINDER=0], [[#include <math.h>]])
REMAINDER_LIBM=
AC_CACHE_CHECK([whether remainder() can be used without linking with libm],
[gl_cv_func_remainder_no_libm],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
double x;
double y;]],
[[return remainder (x, y) > 1;]])],
[gl_cv_func_remainder_no_libm=yes],
[gl_cv_func_remainder_no_libm=no])
])
if test $gl_cv_func_remainder_no_libm = no; then
AC_CACHE_CHECK([whether remainder() can be used with libm],
[gl_cv_func_remainder_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
double x;
double y;]],
[[return remainder (x, y) > 1;]])],
[gl_cv_func_remainder_in_libm=yes],
[gl_cv_func_remainder_in_libm=no])
LIBS="$save_LIBS"
])
if test $gl_cv_func_remainder_in_libm = yes; then
REMAINDER_LIBM=-lm
fi
fi
if test $gl_cv_func_remainder_no_libm = yes \
|| test $gl_cv_func_remainder_in_libm = yes; then
:
m4_ifdef([gl_FUNC_REMAINDER_IEEE], [
if test $gl_remainder_required = ieee && test $REPLACE_REMAINDER = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainder works according to ISO C 99 with IEC 60559],
[gl_cv_func_remainder_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDER_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (double x, double y)
{
return x == y;
}
static double dummy (double x, double y) { return 0; }
int main (int argc, char *argv[])
{
double (* volatile my_remainder) (double, double) = argc ? remainder : dummy;
double f;
/* Test remainder(...,0.0).
This test fails on OSF/1 5.1. */
f = my_remainder (2.0, 0.0);
if (numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_remainder_ieee=yes],
[gl_cv_func_remainder_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_remainder_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_remainder_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_remainder_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_remainder_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_remainder_ieee" in
*yes) ;;
*) REPLACE_REMAINDER=1 ;;
esac
fi
])
else
HAVE_REMAINDER=0
fi
if test $HAVE_REMAINDER = 0 || test $REPLACE_REMAINDER = 1; then
dnl Find libraries needed to link lib/remainder.c.
AC_REQUIRE([gl_FUNC_FABS])
AC_REQUIRE([gl_FUNC_FMOD])
AC_REQUIRE([gl_FUNC_ISNAND])
REMAINDER_LIBM=
dnl Append $FABS_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
case " $REMAINDER_LIBM " in
*" $FABS_LIBM "*) ;;
*) REMAINDER_LIBM="$REMAINDER_LIBM $FABS_LIBM" ;;
esac
dnl Append $FMOD_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
case " $REMAINDER_LIBM " in
*" $FMOD_LIBM "*) ;;
*) REMAINDER_LIBM="$REMAINDER_LIBM $FMOD_LIBM" ;;
esac
dnl Append $ISNAND_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
case " $REMAINDER_LIBM " in
*" $ISNAND_LIBM "*) ;;
*) REMAINDER_LIBM="$REMAINDER_LIBM $ISNAND_LIBM" ;;
esac
fi
AC_SUBST([REMAINDER_LIBM])
])
|
