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1.1 root 1: dnl $Id: acinclude.m4,v 1.4 2003/05/17 20:33:36 fredette Exp $
2:
3: dnl acinclude.m4 - additional tme autoconf macros:
4:
5: dnl Copyright (c) 2001, 2003 Matt Fredette
6: dnl All rights reserved.
7: dnl
8: dnl Redistribution and use in source and binary forms, with or without
9: dnl modification, are permitted provided that the following conditions
10: dnl are met:
11: dnl 1. Redistributions of source code must retain the above copyright
12: dnl notice, this list of conditions and the following disclaimer.
13: dnl 2. Redistributions in binary form must reproduce the above copyright
14: dnl notice, this list of conditions and the following disclaimer in the
15: dnl documentation and/or other materials provided with the distribution.
16: dnl 3. All advertising materials mentioning features or use of this software
17: dnl must display the following acknowledgement:
18: dnl This product includes software developed by Matt Fredette.
19: dnl 4. The name of the author may not be used to endorse or promote products
20: dnl derived from this software without specific prior written permission.
21: dnl
22: dnl THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23: dnl IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24: dnl WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25: dnl DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
26: dnl INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
27: dnl (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28: dnl SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: dnl HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
30: dnl STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31: dnl ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32: dnl POSSIBILITY OF SUCH DAMAGE.
33:
34: dnl AC_CHECK_ALIGNOF(BITS)
35: AC_DEFUN(AC_CHECK_ALIGNOF,
36: [changequote(<<, >>)dnl
37: dnl The name to #define.
38: define(<<AC_TYPE_NAME>>, translit(alignof_int$1_t, [a-z *], [A-Z_P]))dnl
39: dnl The cache variable name.
40: define(<<AC_CV_NAME>>, translit(ac_cv_alignof_int$1_t, [ *], [_p]))dnl
41: changequote([, ])dnl
42: AC_MSG_CHECKING(minimum alignment of int$1_t)
43: AC_CACHE_VAL(AC_CV_NAME,
44: [AC_TRY_RUN([#include <stdio.h>
45: #include <sys/types.h>
46: main()
47: {
48: #if (SIZEOF_SHORT * 8) == $1
49: #define _type short
50: #elif (SIZEOF_INT * 8) == $1
51: #define _type int
52: #else
53: #define _type long
54: #endif
55: char try_align_buffer[sizeof(_type) * 2];
56: int min_align, try_align, status;
57: _type value;
58: FILE *f=fopen("conftestval", "w");
59: if (!f) exit(1);
60: min_align = sizeof(_type);
61: for(try_align = sizeof(_type); try_align-- > 1;) {
62: switch(fork()) {
63: case -1: exit(1);
64: case 0: value = *((_type *) &try_align_buffer[try_align]);
65: fprintf(stderr, "%d\n", (int) value); exit(0);
66: default: break;
67: }
68: wait(&status);
69: if (!status && try_align < min_align) {
70: min_align = try_align;
71: }
72: }
73: fprintf(f, "%d\n", min_align * 8);
74: exit(0);
75: }], AC_CV_NAME=`cat conftestval`, AC_CV_NAME=$1, AC_CV_NAME=$1)])dnl
76: AC_CV_NAME=`expr $AC_CV_NAME / 8`
77: AC_MSG_RESULT($AC_CV_NAME)
78: AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [Define to the minimum alignment, in bytes, of int$1_t.])
79: undefine([AC_TYPE_NAME])dnl
80: undefine([AC_CV_NAME])dnl
81: ])
82:
83: dnl AC_CHECK_SHIFTMAX(BITS)
84: AC_DEFUN(AC_CHECK_SHIFTMAX,
85: [changequote(<<, >>)dnl
86: dnl The name to #define.
87: define(<<AC_TYPE_NAME>>, translit(shiftmax_int$1_t, [a-z *], [A-Z_P]))dnl
88: dnl The cache variable name.
89: define(<<AC_CV_NAME>>, translit(ac_cv_shiftmax_int$1_t, [ *], [_p]))dnl
90: changequote([, ])dnl
91: AC_MSG_CHECKING(maximum shift count for int$1_t)
92: AC_CACHE_VAL(AC_CV_NAME,
93: [AC_TRY_RUN([#include <stdio.h>
94: #include <sys/types.h>
95: main()
96: {
97: #if 8 == $1
98: #define _type char
99: #elif (SIZEOF_SHORT * 8) == $1
100: #define _type short
101: #elif (SIZEOF_INT * 8) == $1
102: #define _type int
103: #elif (SIZEOF_LONG * 8) == $1
104: #define _type long
105: #endif
106: _type center, right, left;
107: unsigned int shift, max_shift;
108: FILE *f=fopen("conftestval", "w");
109: if (!f) exit(1);
110: center = 3 << ((sizeof(center) * 4) - 1);
111: max_shift = 2047;
112: for (shift = (sizeof(center) * 8);
113: shift < 2048;
114: shift <<= 1) {
115: right = (center >> shift);
116: left = (center << shift);
117: if (right != 0
118: || left != 0) {
119: right = (center >> (shift | 1));
120: left = (center << (shift | 1));
121: max_shift = ((right == (center >> 1)
122: && left == (center << 1))
123: ? shift - 1
124: : (sizeof(center) * 8) - 1);
125: break;
126: }
127: }
128: fprintf(f, "%d\n", max_shift + 1);
129: exit(0);
130: }], AC_CV_NAME=`cat conftestval`, AC_CV_NAME=$1, AC_CV_NAME=$1)])dnl
131: AC_CV_NAME=`expr $AC_CV_NAME - 1`
132: AC_MSG_RESULT($AC_CV_NAME)
133: AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [Define to the maximum shift count for a int$1_t.])
134: undefine([AC_TYPE_NAME])dnl
135: undefine([AC_CV_NAME])dnl
136: ])
137:
138: dnl The AC_HEADER_CHECK_PROTOTYPE, AC_HEADER_CHECK_PROTOTYPES,
139: dnl and AC_SYS_SOCKADDR_SA_LEN macros bear the following copyright:
140: dnl
141: dnl Copyright (C) 1997,1998,1999 by the Massachusetts Institute of Technology,
142: dnl Cambridge, MA, USA. All Rights Reserved.
143: dnl
144: dnl This software is being provided to you, the LICENSEE, by the
145: dnl Massachusetts Institute of Technology (M.I.T.) under the following
146: dnl license. By obtaining, using and/or copying this software, you agree
147: dnl that you have read, understood, and will comply with these terms and
148: dnl conditions:
149: dnl
150: dnl WITHIN THOSE CONSTRAINTS, permission to use, copy, modify and distribute
151: dnl this software and its documentation for any purpose and without fee or
152: dnl royalty is hereby granted, provided that you agree to comply with the
153: dnl following copyright notice and statements, including the disclaimer, and
154: dnl that the same appear on ALL copies of the software and documentation,
155: dnl including modifications that you make for internal use or for
156: dnl distribution:
157: dnl
158: dnl THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS
159: dnl OR WARRANTIES, EXPRESS OR IMPLIED. By way of example, but not
160: dnl limitation, M.I.T. MAKES NO REPRESENTATIONS OR WARRANTIES OF
161: dnl MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF
162: dnl THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
163: dnl PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
164: dnl
165: dnl The name of the Massachusetts Institute of Technology or M.I.T. may NOT
166: dnl be used in advertising or publicity pertaining to distribution of the
167: dnl software. Title to copyright in this software and any associated
168: dnl documentation shall at all times remain with M.I.T., and USER agrees to
169: dnl preserve same.
170:
171: dnl AC_HEADER_CHECK_PROTOTYPE(FUNCTION, INCLUDES, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
172: AC_DEFUN(AC_HEADER_CHECK_PROTOTYPE,
173: [AC_MSG_CHECKING([for a prototype for $1])
174: AC_CACHE_VAL(ac_cv_proto_$1,
175: [AC_TRY_COMPILE($2 [
176: struct bonch { int a, b; };
177: struct bonch $1();
178: ], , eval "ac_cv_proto_$1=no", eval "ac_cv_proto_$1=yes")])
179: if eval "test \"`echo '$ac_cv_proto_'$1`\" = yes"; then
180: AC_MSG_RESULT(yes)
181: ifelse([$3], , :, [$3])
182: else
183: AC_MSG_RESULT(no)
184: ifelse([$4], , , [$4
185: ])dnl
186: fi
187: ])
188:
189: dnl AC_HEADER_CHECK_PROTOTYPES(INCLUDES, FUNCTION...)
190: AC_DEFUN(AC_HEADER_CHECK_PROTOTYPES,
191: [for ac_func in $2
192: do
193: AC_HEADER_CHECK_PROTOTYPE($ac_func, $1,
194: [changequote(, )dnl
195: ac_tr_func=PROTO_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
196: changequote([, ])dnl
197: AC_DEFINE_UNQUOTED($ac_tr_func)])dnl
198: done
199: ])
200:
201: dnl AC_SYS_SOCKADDR_SA_LEN
202: AC_DEFUN(AC_SYS_SOCKADDR_SA_LEN,
203: [AC_MSG_CHECKING([for sa_len in struct sockaddr])
204: AC_CACHE_VAL(ac_cv_sys_sockaddr_sa_len,
205: [AC_TRY_COMPILE([
206: #include <sys/types.h>
207: #include <sys/socket.h>
208: ], [
209: int length;
210: struct sockaddr sock;
211: length = sock.sa_len;
212: ], ac_cv_sys_sockaddr_sa_len=yes, ac_cv_sys_sockaddr_sa_len=no)])dnl
213: if test $ac_cv_sys_sockaddr_sa_len = yes; then
214: AC_MSG_RESULT(yes)
215: AC_DEFINE_UNQUOTED(HAVE_SOCKADDR_SA_LEN, [], [Define if your struct sockaddr has sa_len.])
216: else
217: AC_MSG_RESULT(no)
218: fi
219: ])dnl
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