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
|
dnl @synopsis MN_C_FIND_ENDIAN
dnl
dnl Determine endian-ness of target processor.
dnl @version 1.1 Mar 03 2002
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Majority written from scratch to replace the standard autoconf macro
dnl AC_C_BIGENDIAN. Only part remaining from the original it the invocation
dnl of the AC_TRY_RUN macro.
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any
dnl purpose is hereby granted without fee, provided that the above copyright
dnl and this permission notice appear in all copies. No representations are
dnl made about the suitability of this software for any purpose. It is
dnl provided "as is" without express or implied warranty.
dnl Find endian-ness in the following way:
dnl 1) Look in <endian.h>.
dnl 2) If 1) fails, look in <sys/types.h> and <sys/param.h>.
dnl 3) If 1) and 2) fails and not cross compiling run a test program.
dnl 4) If 1) and 2) fails and cross compiling then guess based on target.
AC_DEFUN([MN_C_FIND_ENDIAN],
[AC_CACHE_CHECK(processor byte ordering,
ac_cv_c_byte_order,
# Initialize to unknown
ac_cv_c_byte_order=unknown
if test x$ac_cv_header_endian_h = xyes ; then
# First try <endian.h> which should set BYTE_ORDER.
[AC_TRY_LINK([
#include <endian.h>
#if BYTE_ORDER != LITTLE_ENDIAN
not big endian
#endif
], return 0 ;,
ac_cv_c_byte_order=little
)]
[AC_TRY_LINK([
#include <endian.h>
#if BYTE_ORDER != BIG_ENDIAN
not big endian
#endif
], return 0 ;,
ac_cv_c_byte_order=big
)]
fi
if test $ac_cv_c_byte_order = unknown ; then
[AC_TRY_LINK([
#include <sys/types.h>
#include <sys/param.h>
#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
bogus endian macros
#endif
], return 0 ;,
[AC_TRY_LINK([
#include <sys/types.h>
#include <sys/param.h>
#if BYTE_ORDER != LITTLE_ENDIAN
not big endian
#endif
], return 0 ;,
ac_cv_c_byte_order=little
)]
[AC_TRY_LINK([
#include <sys/types.h>
#include <sys/param.h>
#if BYTE_ORDER != LITTLE_ENDIAN
not big endian
#endif
], return 0 ;,
ac_cv_c_byte_order=little
)]
)]
fi
if test $ac_cv_c_byte_order = unknown ; then
if test $cross_compiling = yes ; then
# This is the last resort. Try to guess the target processor endian-ness
# by looking at the target CPU type.
[
case "$target_cpu" in
alpha* | i?86* | mipsel* | ia64*)
ac_cv_c_byte_order=little
;;
m68* | mips* | powerpc* | hppa* | sparc*)
ac_cv_c_byte_order=big
;;
esac
]
else
AC_TRY_RUN(
[[
int main (void)
{ /* Are we little or big endian? From Harbison&Steele. */
union
{ long l ;
char c [sizeof (long)] ;
} u ;
u.l = 1 ;
return (u.c [sizeof (long) - 1] == 1);
}
]], , ac_cv_c_byte_order=big,
)
AC_TRY_RUN(
[[int main (void)
{ /* Are we little or big endian? From Harbison&Steele. */
union
{ long l ;
char c [sizeof (long)] ;
} u ;
u.l = 1 ;
return (u.c [0] == 1);
}]], , ac_cv_c_byte_order=little,
)
fi
fi
)
if test $ac_cv_c_byte_order = big ; then
ac_cv_c_big_endian=1
ac_cv_c_little_endian=0
elif test $ac_cv_c_byte_order = little ; then
ac_cv_c_big_endian=0
ac_cv_c_little_endian=1
else
ac_cv_c_big_endian=0
ac_cv_c_little_endian=0
AC_MSG_WARN([[*****************************************************************]])
AC_MSG_WARN([[*** Not able to determine endian-ness of target processor. ]])
AC_MSG_WARN([[*** The constants CPU_IS_BIG_ENDIAN and CPU_IS_LITTLE_ENDIAN in ]])
AC_MSG_WARN([[*** src/config.h may need to be hand editied. ]])
AC_MSG_WARN([[*****************************************************************]])
fi
]
)# MN_C_FIND_ENDIAN
|
