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
|
# log10l.m4 serial 5
dnl Copyright (C) 2011-2017 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_LOG10L],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_LOG10])
dnl Persuade glibc <math.h> to declare log10l().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether log10l() is declared. On AIX 5.1 it is not declared.
AC_CHECK_DECL([log10l], , [HAVE_DECL_LOG10L=0], [[#include <math.h>]])
dnl Test whether log10l() exists. Assume that log10l(), if it exists, is
dnl defined in the same library as log10().
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10_LIBM"
AC_CHECK_FUNCS([log10l])
LIBS="$save_LIBS"
if test $ac_cv_func_log10l = yes; then
LOG10L_LIBM="$LOG10_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10L_LIBM"
gl_FUNC_LOG10L_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_log10l_works" in
*yes) ;;
*) REPLACE_LOG10L=1 ;;
esac
else
HAVE_LOG10L=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_log10l, not log10l.
AC_CHECK_DECLS([log10l], [REPLACE_LOG10L=1], , [[#include <math.h>]])
fi
if test $HAVE_LOG10L = 0 || test $REPLACE_LOG10L = 1; then
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
LOG10L_LIBM="$LOG10_LIBM"
else
if test $HAVE_LOG10L = 0; then
AC_REQUIRE([gl_FUNC_LOGL])
LOG10L_LIBM="$LOGL_LIBM"
fi
fi
fi
AC_SUBST([LOG10L_LIBM])
])
dnl Test whether log10l() works.
dnl On OSF/1 5.1, log10l(-0.0L) is NaN.
dnl On IRIX 6.5, log10l(-0.0L) is an unnormalized negative infinity
dnl 0xFFF00000000000007FF0000000000000, should be
dnl 0xFFF00000000000000000000000000000.
dnl On AIX 5.1, log10l(-0.0L) is finite if it's not the first log10l call
dnl in the program.
AC_DEFUN([gl_FUNC_LOG10L_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log10l works], [gl_cv_func_log10l_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
#ifndef log10l /* for AIX */
extern
#ifdef __cplusplus
"C"
#endif
long double log10l (long double);
#endif
volatile long double x;
long double y;
int main ()
{
/* Dummy call, to trigger the AIX 5.1 bug. */
x = 0.6L;
y = log10l (x);
/* This test fails on AIX 5.1, IRIX 6.5, OSF/1 5.1. */
x = -0.0L;
y = log10l (x);
if (!(y + y == y))
return 1;
return 0;
}
]])],
[gl_cv_func_log10l_works=yes],
[gl_cv_func_log10l_works=no],
[case "$host_os" in
aix* | irix* | osf*) gl_cv_func_log10l_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log10l_works="guessing yes" ;;
*) gl_cv_func_log10l_works="guessing yes" ;;
esac
])
])
])
|
