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?RCS: $Id: alignbytes.U,v 3.0 1993/08/18 12:05:23 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 1993/08/18 12:05:23 ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:memalignbytes: Myread cat cc ccflags rm
?MAKE: -pick add $@ %<
?S:memalignbytes:
?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 $memalignbytes /**/
?H:.
: check for alignment requirements
echo " "
case "$memalignbytes" 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 $ccflags try.c -o try >/dev/null 2>&1; then
dflt=`./try`
else
dflt='8'
echo"(I can't seem to compile the test program...)"
fi
;;
*) dflt="$memalignbytes"
;;
esac
rp="Doubles must be aligned on a how-many-byte boundary?"
. ./myread
memalignbytes="$ans"
$rm -f try.c try
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