summaryrefslogtreecommitdiff
path: root/mcon/U/alignbytes.U
blob: 94f182643b7af6e7be267c0a931a171803f4457b (plain)
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
?RCS: $Id: alignbytes.U,v 3.0.1.2 1994/10/29 16:02:28 ram Exp $
?RCS:
?RCS: Copyright (c) 1991-1993, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 3.0.
?RCS:
?RCS: $Log: alignbytes.U,v $
?RCS: Revision 3.0.1.2  1994/10/29  16:02:28  ram
?RCS: patch36: added ?F: line for metalint file checking
?RCS:
?RCS: Revision 3.0.1.1  1994/05/06  14:25:20  ram
?RCS: patch23: avoid ALIGNBYTES, since it conflicts on NetBSD
?RCS:
?RCS: Revision 3.0  1993/08/18  12:05:23  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:alignbytes: Myread cat cc ccflags rm
?MAKE:	-pick add $@ %<
?S:alignbytes:
?S:	This variable holds the number of bytes required to align a
?S:	double. Usual values are 2, 4 and 8.
?S:.
?X: This used to be called ALIGNBYTES, but that conflicts with
?X: <machines/param.h> in NetBSD.
?C:MEM_ALIGNBYTES (ALIGNBYTES):
?C:	This symbol contains the number of bytes required to align a
?C:	double. Usual values are 2, 4 and 8.
?C:.
?H:#define MEM_ALIGNBYTES $alignbytes	/**/
?H:.
?F:!try
: check for alignment requirements
echo " "
case "$alignbytes" in
'') echo "Checking alignment constraints..." >&4
	$cat >try.c <<'EOCP'
struct foobar {
	char foo;
	double bar;
} try;
main()
{
	printf("%d\n", (char *)&try.bar - (char *)&try.foo);
}
EOCP
	if $cc $ccflags try.c -o try >/dev/null 2>&1; then
		dflt=`./try`
	else
		dflt='8'
		echo"(I can't seem to compile the test program...)"
	fi
	;;
*) dflt="$alignbytes"
	;;
esac
rp="Doubles must be aligned on a how-many-byte boundary?"
. ./myread
alignbytes="$ans"
$rm -f try.c try