Use AC_C_BIGENDIAN for detecting $HOST endianness

* AC_C_BIGENDIAN is fully cross-compile aware

David Seifert committed 9 years ago

Commit d2e7cb51 parent ca40d093 files · +13 −162Browse files

Unified · Split

3 files

Win32/config.h +2 −2
configure.ac +11 −5
m4/endian.m4 +0 −155

@@ -43,10 +43,10 @@ · 42 unmodified lines
43	43	/* Target processor clips on positive float to int conversion. */
44	44	#define CPU_CLIPS_POSITIVE 0
45	45
46		−/* Target processor is big endian. */
	46	+/* Host processor is big endian. */
47	47	#define CPU_IS_BIG_ENDIAN 0
48	48
49		−/* Target processor is little endian. */
	49	+/* Host processor is little endian. */
50	50	#define CPU_IS_LITTLE_ENDIAN 1
51	51
52	52	/* Set to 1 to enable debugging. */

configure.ac+11−5

@@ -112,12 +112,18 @@ AC_CHECK_SIZEOF(double,8) · 111 unmodified lines
112	112	#====================================================================================
113	113	# Determine endian-ness of target processor.
114	114
115		−AC_C_FIND_ENDIAN
	115	+AC_C_BIGENDIAN([
	116	+ dnl big-endian
	117	+ ac_cv_c_big_endian=1
	118	+ ac_cv_c_little_endian=0
	119	+ ], [
	120	+ dnl little-endian
	121	+ ac_cv_c_big_endian=0
	122	+ ac_cv_c_little_endian=1
	123	+ ])
116	124
117		−AC_DEFINE_UNQUOTED(CPU_IS_BIG_ENDIAN, ${ac_cv_c_big_endian},
118		− [Target processor is big endian.])
119		−AC_DEFINE_UNQUOTED(CPU_IS_LITTLE_ENDIAN, ${ac_cv_c_little_endian},
120		− [Target processor is little endian.])
	125	+AC_DEFINE_UNQUOTED([CPU_IS_BIG_ENDIAN], [${ac_cv_c_big_endian}], [Host processor is big endian.])
	126	+AC_DEFINE_UNQUOTED([CPU_IS_LITTLE_ENDIAN], [${ac_cv_c_little_endian}], [Host processor is little endian.])
121	127
122	128	#====================================================================================
123	129	# Check for functions.

m4/endian.m4+0−155

@@ -1,155 +0,0 @@
1		−dnl @synopsis AC_C_FIND_ENDIAN
2		−dnl
3		−dnl Determine endian-ness of target processor.
4		−dnl @version 1.1 Mar 03 2002
5		−dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
6		−dnl
7		−dnl Majority written from scratch to replace the standard autoconf macro
8		−dnl AC_C_BIGENDIAN. Only part remaining from the original it the invocation
9		−dnl of the AC_TRY_RUN macro.
10		−dnl
11		−dnl Permission to use, copy, modify, distribute, and sell this file for any
12		−dnl purpose is hereby granted without fee, provided that the above copyright
13		−dnl and this permission notice appear in all copies. No representations are
14		−dnl made about the suitability of this software for any purpose. It is
15		−dnl provided "as is" without express or implied warranty.
16		−
17		−dnl Find endian-ness in the following way:
18		−dnl 1) Look in <endian.h>.
19		−dnl 2) If 1) fails, look in <sys/types.h> and <sys/param.h>.
20		−dnl 3) If 1) and 2) fails and not cross compiling run a test program.
21		−dnl 4) If 1) and 2) fails and cross compiling then guess based on target.
22		−
23		−AC_DEFUN([AC_C_FIND_ENDIAN],
24		−[AC_CACHE_CHECK(processor byte ordering,
25		− ac_cv_c_byte_order,
26		−
27		−# Initialize to unknown
28		−ac_cv_c_byte_order=unknown
29		−
30		−if test x$ac_cv_header_endian_h = xyes ; then
31		−
32		− # First try <endian.h> which should set BYTE_ORDER.
33		−
34		− [AC_TRY_LINK([
35		− #include <endian.h>
36		− #if BYTE_ORDER != LITTLE_ENDIAN
37		− not big endian
38		− #endif
39		− ], return 0 ;,
40		− ac_cv_c_byte_order=little
41		− )]
42		−
43		− [AC_TRY_LINK([
44		− #include <endian.h>
45		− #if BYTE_ORDER != BIG_ENDIAN
46		− not big endian
47		− #endif
48		− ], return 0 ;,
49		− ac_cv_c_byte_order=big
50		− )]
51		−
52		− fi
53		−
54		−if test $ac_cv_c_byte_order = unknown ; then
55		−
56		− [AC_TRY_LINK([
57		− #include <sys/types.h>
58		− #include <sys/param.h>
59		− #if !BYTE_ORDER \|\| !BIG_ENDIAN \|\| !LITTLE_ENDIAN
60		− bogus endian macros
61		− #endif
62		− ], return 0 ;,
63		−
64		− [AC_TRY_LINK([
65		− #include <sys/types.h>
66		− #include <sys/param.h>
67		− #if BYTE_ORDER != LITTLE_ENDIAN
68		− not big endian
69		− #endif
70		− ], return 0 ;,
71		− ac_cv_c_byte_order=little
72		− )]
73		−
74		− [AC_TRY_LINK([
75		− #include <sys/types.h>
76		− #include <sys/param.h>
77		− #if BYTE_ORDER != LITTLE_ENDIAN
78		− not big endian
79		− #endif
80		− ], return 0 ;,
81		− ac_cv_c_byte_order=little
82		− )]
83		−
84		− )]
85		−
86		− fi
87		−
88		−if test $ac_cv_c_byte_order = unknown ; then
89		− if test $cross_compiling = yes ; then
90		− # This is the last resort. Try to guess the target processor endian-ness
91		− # by looking at the target CPU type.
92		− [
93		− case "$target_cpu" in
94		− alpha* \| i?86* \| mipsel* \| ia64*)
95		− ac_cv_c_byte_order=little
96		− ;;
97		−
98		− m68* \| mips* \| powerpc* \| hppa* \| sparc*)
99		− ac_cv_c_byte_order=big
100		− ;;
101		−
102		− esac
103		− ]
104		− else
105		− AC_TRY_RUN(
106		− [[
107		− int main (void)
108		− { /* Are we little or big endian? From Harbison&Steele. */
109		− union
110		− { long l ;
111		− char c [sizeof (long)] ;
112		− } u ;
113		− u.l = 1 ;
114		− return (u.c [sizeof (long) - 1] == 1);
115		− }
116		− ]], , ac_cv_c_byte_order=big,
117		− )
118		−
119		− AC_TRY_RUN(
120		− [[int main (void)
121		− { /* Are we little or big endian? From Harbison&Steele. */
122		− union
123		− { long l ;
124		− char c [sizeof (long)] ;
125		− } u ;
126		− u.l = 1 ;
127		− return (u.c [0] == 1);
128		− }]], , ac_cv_c_byte_order=little,
129		− )
130		− fi
131		− fi
132		−
133		−)
134		−
135		−if test $ac_cv_c_byte_order = big ; then
136		− ac_cv_c_big_endian=1
137		− ac_cv_c_little_endian=0
138		−elif test $ac_cv_c_byte_order = little ; then
139		− ac_cv_c_big_endian=0
140		− ac_cv_c_little_endian=1
141		−else
142		− ac_cv_c_big_endian=0
143		− ac_cv_c_little_endian=0
144		−
145		− AC_MSG_WARN([[*****************************************************************]])
146		− AC_MSG_WARN([[*** Not able to determine endian-ness of target processor. ]])
147		− AC_MSG_WARN([[*** The constants CPU_IS_BIG_ENDIAN and CPU_IS_LITTLE_ENDIAN in ]])
148		− AC_MSG_WARN([[*** src/config.h may need to be hand editied. ]])
149		− AC_MSG_WARN([[*****************************************************************]])
150		− fi
151		−
152		−]
153		−)# AC_C_FIND_ENDIAN
154		−
155		−

Use AC_C_BIGENDIAN for detecting $HOST endianness

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