1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
# hypotl.m4 serial 6
dnl Copyright (C) 2012-2017 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_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
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_hypotl, not hypotl.
AC_CHECK_DECLS([hypotl], [REPLACE_HYPOTL=1], , [[#include <math.h>]])
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
])
])
])
|
