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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
# logl.m4 serial 14
dnl Copyright (C) 2010-2021 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_LOGL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
dnl Persuade glibc <math.h> to declare logl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
LOGL_LIBM=
AC_CACHE_CHECK([whether logl() can be used without linking with libm],
[gl_cv_func_logl_no_libm],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double (*funcptr) (long double) = logl;
long double x;]],
[[return funcptr (x) > 1
|| logl (x) > 1;]])],
[gl_cv_func_logl_no_libm=yes],
[gl_cv_func_logl_no_libm=no])
])
if test $gl_cv_func_logl_no_libm = no; then
AC_CACHE_CHECK([whether logl() can be used with libm],
[gl_cv_func_logl_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double (*funcptr) (long double) = logl;
long double x;]],
[[return funcptr (x) > 1
|| logl (x) > 1;]])],
[gl_cv_func_logl_in_libm=yes],
[gl_cv_func_logl_in_libm=no])
LIBS="$save_LIBS"
])
if test $gl_cv_func_logl_in_libm = yes; then
LOGL_LIBM=-lm
fi
fi
if test $gl_cv_func_logl_no_libm = yes \
|| test $gl_cv_func_logl_in_libm = yes; then
dnl Also check whether it's declared.
dnl Mac OS X 10.3 has logl() in libc but doesn't declare it in <math.h>.
AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [[#include <math.h>]])
save_LIBS="$LIBS"
LIBS="$LIBS $LOGL_LIBM"
gl_FUNC_LOGL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_logl_works" in
*yes) ;;
*) REPLACE_LOGL=1 ;;
esac
else
HAVE_LOGL=0
HAVE_DECL_LOGL=0
fi
if test $HAVE_LOGL = 0 || test $REPLACE_LOGL = 1; then
dnl Find libraries needed to link lib/logl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
AC_REQUIRE([gl_FUNC_LOG])
LOGL_LIBM="$LOG_LIBM"
else
if test $HAVE_LOGL = 0; then
AC_REQUIRE([gl_FUNC_FREXPL])
AC_REQUIRE([gl_FUNC_ISNANL])
AC_REQUIRE([gl_FUNC_FLOORL])
dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
case " $LOGL_LIBM " in
*" $FREXPL_LIBM "*) ;;
*) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
esac
dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
case " $LOGL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
esac
dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
case " $LOGL_LIBM " in
*" $FLOORL_LIBM "*) ;;
*) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;
esac
fi
fi
fi
AC_SUBST([LOGL_LIBM])
])
dnl Test whether logl() works.
dnl On OSF/1 5.1, logl(-0.0L) is NaN.
dnl On NetBSD 9.0, the result is accurate to only 16 digits.
AC_DEFUN([gl_FUNC_LOGL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether logl works], [gl_cv_func_logl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <float.h>
#include <math.h>
/* Override the values of <float.h>, like done in float.in.h. */
#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if defined __i386__ && (defined __FreeBSD__ || defined __DragonFly__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
#endif
#if defined __sgi && (LDBL_MANT_DIG >= 106)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 106
# if defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
# endif
#endif
#undef logl
extern
#ifdef __cplusplus
"C"
#endif
long double logl (long double);
static long double dummy (long double x) { return 0; }
volatile long double gx;
long double gy;
int main (int argc, char *argv[])
{
long double (* volatile my_logl) (long double) = argc ? logl : dummy;
int result = 0;
/* This test fails on OSF/1 5.1. */
{
gx = -0.0L;
gy = logl (gx);
if (!(gy + gy == gy))
result |= 1;
}
/* This test fails on NetBSD 9.0. */
{
const long double TWO_LDBL_MANT_DIG = /* 2^LDBL_MANT_DIG */
(long double) (1U << ((LDBL_MANT_DIG - 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 2) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 3) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 4) / 5));
long double x = 16.981137113807045L;
long double err = (my_logl (x) + my_logl (1.0L / x)) * TWO_LDBL_MANT_DIG;
if (!(err >= -100.0L && err <= 100.0L))
result |= 2;
}
return result;
}
]])],
[gl_cv_func_logl_works=yes],
[gl_cv_func_logl_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_logl_works="guessing yes" ;;
# Guess yes on musl systems.
*-musl*) gl_cv_func_logl_works="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_logl_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_logl_works="$gl_cross_guess_normal" ;;
esac
])
])
])
|
