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|
# hypotl.m4 serial 5
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_HYPOTL],
[
m4_divert_text([DEFAULTS], [gl_hypotl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_HYPOT])
dnl Persuade glibc <math.h> to declare hypotl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether hypotl() exists. Assume that hypotl(), if it exists, is
dnl defined in the same library as hypot().
save_LIBS="$LIBS"
LIBS="$LIBS $HYPOT_LIBM"
AC_CHECK_FUNCS([hypotl])
LIBS="$save_LIBS"
if test $ac_cv_func_hypotl = yes; then
HYPOTL_LIBM="$HYPOT_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $HYPOTL_LIBM"
gl_FUNC_HYPOTL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_hypotl_works" in
*yes) ;;
*) REPLACE_HYPOTL=1 ;;
esac
m4_ifdef([gl_FUNC_HYPOTL_IEEE], [
if test $gl_hypotl_required = ieee && test $REPLACE_HYPOTL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether hypotl works according to ISO C 99 with IEC 60559],
[gl_cv_func_hypotl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $HYPOTL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (long double x, long double y)
{
return x == y;
}
static long double dummy (long double x, long double y) { return 0; }
long double zero;
long double one = 1.0L;
int main (int argc, char *argv[])
{
long double (*my_hypotl) (long double, long double) = argc ? hypotl : dummy;
long double f;
/* Test hypotl(NaN,Infinity).
This test fails on OSF/1 5.1 and native Windows. */
f = my_hypotl (zero / zero, one / zero);
if (!numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_hypotl_ieee=yes],
[gl_cv_func_hypotl_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_hypotl_ieee="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_hypotl_ieee="guessing no" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_hypotl_ieee" in
*yes) ;;
*) REPLACE_HYPOTL=1 ;;
esac
fi
])
else
HAVE_HYPOTL=0
fi
if test $HAVE_HYPOTL = 0 || test $REPLACE_HYPOTL = 1; then
dnl Find libraries needed to link lib/hypotl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
HYPOTL_LIBM="$HYPOT_LIBM"
else
AC_REQUIRE([gl_FUNC_FABSL])
AC_REQUIRE([gl_FUNC_FREXPL])
AC_REQUIRE([gl_FUNC_LDEXPL])
AC_REQUIRE([gl_FUNC_SQRTL])
HYPOTL_LIBM=
dnl Append $FABSL_LIBM to HYPOTL_LIBM, avoiding gratuitous duplicates.
case " $HYPOTL_LIBM " in
*" $FABSL_LIBM "*) ;;
*) HYPOTL_LIBM="$HYPOTL_LIBM $FABSL_LIBM" ;;
esac
dnl Append $FREXPL_LIBM to HYPOTL_LIBM, avoiding gratuitous duplicates.
case " $HYPOTL_LIBM " in
*" $FREXPL_LIBM "*) ;;
*) HYPOTL_LIBM="$HYPOTL_LIBM $FREXPL_LIBM" ;;
esac
dnl Append $LDEXPL_LIBM to HYPOTL_LIBM, avoiding gratuitous duplicates.
case " $HYPOTL_LIBM " in
*" $LDEXPL_LIBM "*) ;;
*) HYPOTL_LIBM="$HYPOTL_LIBM $LDEXPL_LIBM" ;;
esac
dnl Append $SQRTL_LIBM to HYPOTL_LIBM, avoiding gratuitous duplicates.
case " $HYPOTL_LIBM " in
*" $SQRTL_LIBM "*) ;;
*) HYPOTL_LIBM="$HYPOTL_LIBM $SQRTL_LIBM" ;;
esac
fi
fi
AC_SUBST([HYPOTL_LIBM])
])
dnl Test whether hypotl() works.
dnl On OpenBSD 5.1/SPARC,
dnl hypotl (2.5541394760659556563446062497337725156L, 7.7893454113437840832487794525518765265L)
dnl has rounding errors that eat up the last 8 to 9 decimal digits.
AC_DEFUN([gl_FUNC_HYPOTL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether hypotl works], [gl_cv_func_hypotl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <float.h>
#include <math.h>
static long double
my_ldexpl (long double x, int d)
{
for (; d > 0; d--)
x *= 2.0L;
for (; d < 0; d++)
x *= 0.5L;
return x;
}
volatile long double x;
volatile long double y;
volatile long double z;
int main ()
{
long double err;
x = 2.5541394760659556563446062497337725156L;
y = 7.7893454113437840832487794525518765265L;
z = hypotl (x, y);
err = z * z - (x * x + y * y);
err = my_ldexpl (err, LDBL_MANT_DIG);
if (err < 0)
err = - err;
if (err > 1000.0L)
return 1;
return 0;
}
]])],
[gl_cv_func_hypotl_works=yes],
[gl_cv_func_hypotl_works=no],
[case "$host_os" in
openbsd*) gl_cv_func_hypotl_works="guessing no";;
*) gl_cv_func_hypotl_works="guessing yes";;
esac
])
])
])
|
