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# fmodf.m4 serial 6
dnl Copyright (C) 2011-2017 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_FMODF],
[
m4_divert_text([DEFAULTS], [gl_fmodf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_FMOD])
dnl Persuade glibc <math.h> to declare fmodf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether fmodf() exists. Assume that fmodf(), if it exists, is
dnl defined in the same library as fmod().
save_LIBS="$LIBS"
LIBS="$LIBS $FMOD_LIBM"
AC_CHECK_FUNCS([fmodf])
LIBS="$save_LIBS"
if test $ac_cv_func_fmodf = yes; then
FMODF_LIBM="$FMOD_LIBM"
m4_ifdef([gl_FUNC_FMODF_IEEE], [
if test $gl_fmodf_required = ieee && test $REPLACE_FMODF = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether fmodf works according to ISO C 99 with IEC 60559],
[gl_cv_func_fmodf_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $FMODF_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (float x, float y)
{
return x == y;
}
static float dummy (float x, float y) { return 0; }
int main (int argc, char *argv[])
{
float (*my_fmodf) (float, float) = argc ? fmodf : dummy;
float f;
/* Test fmodf(...,0.0f).
This test fails on OSF/1 5.1. */
f = my_fmodf (2.0f, 0.0f);
if (numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_fmodf_ieee=yes],
[gl_cv_func_fmodf_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_fmodf_ieee="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_fmodf_ieee="guessing no" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_fmodf_ieee" in
*yes) ;;
*) REPLACE_FMODF=1 ;;
esac
fi
])
else
HAVE_FMODF=0
dnl If the function is declared but does not appear to exist, it may be
dnl defined as an inline function. In order to avoid a conflict, we have
dnl to define rpl_fmodf, not fmodf.
AC_CHECK_DECLS([fmodf], [REPLACE_FMODF=1], , [[#include <math.h>]])
fi
if test $HAVE_FMODF = 0 || test $REPLACE_FMODF = 1; then
dnl Find libraries needed to link lib/fmodf.c.
FMODF_LIBM="$FMOD_LIBM"
fi
AC_SUBST([FMODF_LIBM])
])
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