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# remainderf.m4 serial 7
dnl Copyright (C) 2012 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_REMAINDERF],
[
m4_divert_text([DEFAULTS], [gl_remainderf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_REMAINDER])
dnl Persuade glibc <math.h> to declare remainderf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether remainderf() exists. Assume that remainderf(), if it exists, is
dnl defined in the same library as remainder().
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDER_LIBM"
AC_CACHE_CHECK([for remainderf],
[gl_cv_func_remainderf],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
float remainderf (float, float);
float (*funcptr) (float, float) = remainderf;
float x;
float y;]],
[[return funcptr (x, y) > 1
|| remainderf (x, y) > 1;]])],
[gl_cv_func_remainderf=yes],
[gl_cv_func_remainderf=no])
])
LIBS="$save_LIBS"
if test $gl_cv_func_remainderf = yes; then
REMAINDERF_LIBM="$REMAINDER_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDERF_LIBM"
gl_FUNC_REMAINDERF_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_remainderf_works" in
*yes) ;;
*) REPLACE_REMAINDERF=1 ;;
esac
m4_ifdef([gl_FUNC_REMAINDERF_IEEE], [
if test $gl_remainderf_required = ieee && test $REPLACE_REMAINDERF = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainderf works according to ISO C 99 with IEC 60559],
[gl_cv_func_remainderf_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDERF_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
float remainderf (float, float);
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (float x, float y)
{
return x == y;
}
static float dummy (float x, float y) { return 0; }
int main (int argc, char *argv[])
{
float (*my_remainderf) (float, float) = argc ? remainderf : dummy;
float f;
/* Test remainderf(...,0.0f).
This test fails on OSF/1 5.1. */
f = my_remainderf (2.0f, 0.0f);
if (numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_remainderf_ieee=yes],
[gl_cv_func_remainderf_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_remainderf_ieee="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_remainderf_ieee="guessing no" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_remainderf_ieee" in
*yes) ;;
*) REPLACE_REMAINDERF=1 ;;
esac
fi
])
else
HAVE_REMAINDERF=0
fi
if test $HAVE_REMAINDERF = 0 || test $REPLACE_REMAINDERF = 1; then
dnl Find libraries needed to link lib/remainderf.c.
if test $gl_cv_func_remainder_no_libm = yes \
|| test $gl_cv_func_remainder_in_libm = yes; then
AC_DEFINE([HAVE_REMAINDER], [1],
[Define to 1 if the remainder() function is available in libc or libm.])
REMAINDERF_LIBM="$REMAINDER_LIBM"
else
AC_REQUIRE([gl_FUNC_FABSF])
AC_REQUIRE([gl_FUNC_FMODF])
AC_REQUIRE([gl_FUNC_ISNANF])
REMAINDERF_LIBM=
dnl Append $FABSF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERF_LIBM " in
*" $FABSF_LIBM "*) ;;
*) REMAINDERF_LIBM="$REMAINDERF_LIBM $FABSF_LIBM" ;;
esac
dnl Append $FMODF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERF_LIBM " in
*" $FMODF_LIBM "*) ;;
*) REMAINDERF_LIBM="$REMAINDERF_LIBM $FMODF_LIBM" ;;
esac
dnl Append $ISNANF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERF_LIBM " in
*" $ISNANF_LIBM "*) ;;
*) REMAINDERF_LIBM="$REMAINDERF_LIBM $ISNANF_LIBM" ;;
esac
fi
fi
AC_SUBST([REMAINDERF_LIBM])
])
dnl Test whether remainderf() works.
dnl It runs into an endless loop on IRIX 6.5.
AC_DEFUN([gl_FUNC_REMAINDERF_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS_ONCE([alarm])
AC_CACHE_CHECK([whether remainderf works], [gl_cv_func_remainderf_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
#if HAVE_ALARM
# include <unistd.h>
#endif
extern
#ifdef __cplusplus
"C"
#endif
float remainderf (float, float);
volatile float x;
volatile float y;
float z;
int main ()
{
#if HAVE_ALARM
alarm (5);
#endif
/* This test fails on IRIX 6.5. */
x = 9.316161e+37f;
y = 0.5475547314f;
z = remainderf (x, y);
return 0;
}
]])],
[gl_cv_func_remainderf_works=yes],
[gl_cv_func_remainderf_works=no],
[case "$host_os" in
irix*) gl_cv_func_remainderf_works="guessing no";;
*) gl_cv_func_remainderf_works="guessing yes";;
esac
])
])
])
|
