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# fmod.m4 serial 7
dnl Copyright (C) 2011-2019 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_FMOD],
[
m4_divert_text([DEFAULTS], [gl_fmod_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Determine FMOD_LIBM.
gl_COMMON_DOUBLE_MATHFUNC([fmod])
m4_ifdef([gl_FUNC_FMOD_IEEE], [
if test $gl_fmod_required = ieee && test $REPLACE_FMOD = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether fmod works according to ISO C 99 with IEC 60559],
[gl_cv_func_fmod_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $FMOD_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_DOUBLE_MINUS_ZERO_CODE[
]gl_DOUBLE_SIGNBIT_CODE[
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (double x, double y)
{
return x == y;
}
static double dummy (double x, double y) { return 0; }
int main (int argc, char *argv[])
{
double (* volatile my_fmod) (double, double) = argc ? fmod : dummy;
int result = 0;
double f;
/* Test fmod(...,0.0).
This test fails on OSF/1 5.1. */
f = my_fmod (2.0, 0.0);
if (numeric_equal (f, f))
result |= 1;
/* Test fmod(-0.0,...).
This test fails on native Windows. */
f = my_fmod (minus_zerod, 2.0);
if (!(f == 0.0) || (signbitd (minus_zerod) && !signbitd (f)))
result |= 2;
return result;
}
]])],
[gl_cv_func_fmod_ieee=yes],
[gl_cv_func_fmod_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_fmod_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_fmod_ieee="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_fmod_ieee="guessing no" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_fmod_ieee" in
*yes) ;;
*) REPLACE_FMOD=1 ;;
esac
fi
])
if test $REPLACE_FMOD = 1; then
dnl Find libraries needed to link lib/fmod.c.
AC_REQUIRE([gl_FUNC_FABS])
AC_REQUIRE([gl_FUNC_FREXP])
AC_REQUIRE([gl_FUNC_TRUNC])
AC_REQUIRE([gl_FUNC_LDEXP])
AC_REQUIRE([gl_FUNC_ISNAND])
FMOD_LIBM=
dnl Append $FABS_LIBM to FMOD_LIBM, avoiding gratuitous duplicates.
case " $FMOD_LIBM " in
*" $FABS_LIBM "*) ;;
*) FMOD_LIBM="$FMOD_LIBM $FABS_LIBM" ;;
esac
dnl Append $FREXP_LIBM to FMOD_LIBM, avoiding gratuitous duplicates.
case " $FMOD_LIBM " in
*" $FREXP_LIBM "*) ;;
*) FMOD_LIBM="$FMOD_LIBM $FREXP_LIBM" ;;
esac
dnl Append $TRUNC_LIBM to FMOD_LIBM, avoiding gratuitous duplicates.
case " $FMOD_LIBM " in
*" $TRUNC_LIBM "*) ;;
*) FMOD_LIBM="$FMOD_LIBM $TRUNC_LIBM" ;;
esac
dnl Append $LDEXP_LIBM to FMOD_LIBM, avoiding gratuitous duplicates.
case " $FMOD_LIBM " in
*" $LDEXP_LIBM "*) ;;
*) FMOD_LIBM="$FMOD_LIBM $LDEXP_LIBM" ;;
esac
dnl Append $ISNAND_LIBM to FMOD_LIBM, avoiding gratuitous duplicates.
case " $FMOD_LIBM " in
*" $ISNAND_LIBM "*) ;;
*) FMOD_LIBM="$FMOD_LIBM $ISNAND_LIBM" ;;
esac
fi
])
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