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
|
# logl.m4 serial 9
dnl Copyright (C) 2010-2014 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 $FLOORL_LIBM" ;;
esac
fi
fi
fi
AC_SUBST([LOGL_LIBM])
])
dnl Test whether logl() works.
dnl On OSF/1 5.1, logl(-0.0L) is NaN.
AC_DEFUN([gl_FUNC_LOGL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether logl works], [gl_cv_func_logl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
volatile long double x;
long double y;
int main ()
{
x = -0.0L;
y = logl (x);
if (!(y + y == y))
return 1;
return 0;
}
]])],
[gl_cv_func_logl_works=yes],
[gl_cv_func_logl_works=no],
[case "$host_os" in
osf*) gl_cv_func_logl_works="guessing no";;
*) gl_cv_func_logl_works="guessing yes";;
esac
])
])
])
|
