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# hypotf.m4 serial 10
dnl Copyright (C) 2012-2021 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_HYPOTF],
[
m4_divert_text([DEFAULTS], [gl_hypotf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_HYPOT])
dnl Persuade glibc <math.h> to declare hypotf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether hypotf() exists. Assume that hypotf(), if it exists, is
dnl defined in the same library as hypot().
save_LIBS="$LIBS"
LIBS="$LIBS $HYPOT_LIBM"
AC_CHECK_FUNCS([hypotf])
LIBS="$save_LIBS"
if test $ac_cv_func_hypotf = yes; then
HYPOTF_LIBM="$HYPOT_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $HYPOTF_LIBM"
gl_FUNC_HYPOTF_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_hypotf_works" in
*yes) ;;
*) REPLACE_HYPOTF=1 ;;
esac
m4_ifdef([gl_FUNC_HYPOTF_IEEE], [
if test $gl_hypotf_required = ieee && test $REPLACE_HYPOTF = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether hypotf works according to ISO C 99 with IEC 60559],
[gl_cv_func_hypotf_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $HYPOTF_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (float x, float y)
{
return x == y;
}
static float dummy (float x, float y) { return 0; }
float zero;
float one = 1.0f;
int main (int argc, char *argv[])
{
float (* volatile my_hypotf) (float, float) = argc ? hypotf : dummy;
float f;
/* Test hypotf(NaN,Infinity).
This test fails on OSF/1 5.1 and native Windows. */
f = my_hypotf (zero / zero, one / zero);
if (!numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_hypotf_ieee=yes],
[gl_cv_func_hypotf_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_hypotf_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl*) gl_cv_func_hypotf_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_hypotf_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_hypotf_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_hypotf_ieee" in
*yes) ;;
*) REPLACE_HYPOTF=1 ;;
esac
fi
])
else
HAVE_HYPOTF=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_hypotf, not hypotf.
AC_CHECK_DECLS([hypotf], [REPLACE_HYPOTF=1], , [[#include <math.h>]])
fi
if test $HAVE_HYPOTF = 0 || test $REPLACE_HYPOTF = 1; then
dnl Find libraries needed to link lib/hypotf.c.
HYPOTF_LIBM="$HYPOT_LIBM"
fi
AC_SUBST([HYPOTF_LIBM])
])
dnl Test whether hypotf() works.
dnl It returns wrong values on NetBSD 5.1/x86_64 and OpenBSD 4.9/x86.
AC_DEFUN([gl_FUNC_HYPOTF_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether hypotf works], [gl_cv_func_hypotf_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <float.h>
#include <math.h>
volatile float x;
volatile float y;
volatile float z;
int main ()
{
int result = 0;
/* This test fails on NetBSD 5.1. */
{
x = FLT_MIN * 2.0f;
y = FLT_MIN * 3.0f;
z = hypotf (x, y);
if (!(z >= FLT_MIN * 2.0f && z <= FLT_MIN * 4.0f))
result |= 1;
}
/* This test fails on OpenBSD 4.9. */
{
x = FLT_MAX;
y = FLT_MAX * 0.5f;
z = hypotf (x, y);
if (!(z > 0 && z == z + z))
result |= 2;
}
return result;
}
]])],
[gl_cv_func_hypotf_works=yes],
[gl_cv_func_hypotf_works=no],
[case "$host_os" in
netbsd* | openbsd*) gl_cv_func_hypotf_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_hypotf_works="guessing yes" ;;
*) gl_cv_func_hypotf_works="guessing yes" ;;
esac
])
])
])
|
