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
|
# log10f.m4 serial 6
dnl Copyright (C) 2011-2013 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_LOG10F],
[
m4_divert_text([DEFAULTS], [gl_log10f_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_LOG10])
dnl Persuade glibc <math.h> to declare log10f().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether log10f() exists. Assume that log10f(), if it exists, is
dnl defined in the same library as log10().
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10_LIBM"
AC_CHECK_FUNCS([log10f])
LIBS="$save_LIBS"
if test $ac_cv_func_log10f = yes; then
LOG10F_LIBM="$LOG10_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10F_LIBM"
gl_FUNC_LOG10F_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_log10f_works" in
*yes) ;;
*) REPLACE_LOG10F=1 ;;
esac
m4_ifdef([gl_FUNC_LOG10F_IEEE], [
if test $gl_log10f_required = ieee && test $REPLACE_LOG10F = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log10f works according to ISO C 99 with IEC 60559],
[gl_cv_func_log10f_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10F_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (float x, float y)
{
return x == y;
}
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
float (*my_log10f) (float) = argc ? log10f : dummy;
/* Test log10f(negative).
This test fails on NetBSD 5.1. */
float y = my_log10f (-1.0f);
if (numeric_equal (y, y))
return 1;
return 0;
}
]])],
[gl_cv_func_log10f_ieee=yes],
[gl_cv_func_log10f_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_log10f_ieee="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_log10f_ieee="guessing no" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_log10f_ieee" in
*yes) ;;
*) REPLACE_LOG10F=1 ;;
esac
fi
])
else
HAVE_LOG10F=0
fi
if test $HAVE_LOG10F = 0 || test $REPLACE_LOG10F = 1; then
dnl Find libraries needed to link lib/log10f.c.
if test $HAVE_LOG10F = 0; then
LOG10F_LIBM="$LOG10_LIBM"
fi
fi
AC_SUBST([LOG10F_LIBM])
])
dnl Test whether log10f() works.
dnl On OSF/1 5.1, log10f(-0.0f) is NaN.
AC_DEFUN([gl_FUNC_LOG10F_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log10f works], [gl_cv_func_log10f_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
volatile float x;
float y;
int main ()
{
x = -0.0f;
y = log10f (x);
if (!(y + y == y))
return 1;
return 0;
}
]])],
[gl_cv_func_log10f_works=yes],
[gl_cv_func_log10f_works=no],
[case "$host_os" in
osf*) gl_cv_func_log10f_works="guessing no";;
*) gl_cv_func_log10f_works="guessing yes";;
esac
])
])
])
|
