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| 85e6fe83 |
1 | ?RCS: $Id: alignbytes.U,v 3.0 1993/08/18 12:05:23 ram Exp $ |
| 2 | ?RCS: |
| 3 | ?RCS: Copyright (c) 1991-1993, Raphael Manfredi |
| 4 | ?RCS: |
| 5 | ?RCS: You may redistribute only under the terms of the Artistic Licence, |
| 6 | ?RCS: as specified in the README file that comes with the distribution. |
| 7 | ?RCS: You may reuse parts of this distribution only within the terms of |
| 8 | ?RCS: that same Artistic Licence; a copy of which may be found at the root |
| 9 | ?RCS: of the source tree for dist 3.0. |
| 10 | ?RCS: |
| 11 | ?RCS: $Log: alignbytes.U,v $ |
| 12 | ?RCS: Revision 3.0 1993/08/18 12:05:23 ram |
| 13 | ?RCS: Baseline for dist 3.0 netwide release. |
| 14 | ?RCS: |
| 15 | ?MAKE:memalignbytes: Myread cat cc ccflags rm |
| 16 | ?MAKE: -pick add $@ %< |
| 17 | ?S:memalignbytes: |
| 18 | ?S: This variable holds the number of bytes required to align a |
| 19 | ?S: double. Usual values are 2, 4 and 8. |
| 20 | ?S:. |
| 21 | ?X: This used to be called ALIGNBYTES, but that conflicts with |
| 22 | ?X: <machines/param.h> in NetBSD. |
| 23 | ?C:MEM_ALIGNBYTES (ALIGNBYTES): |
| 24 | ?C: This symbol contains the number of bytes required to align a |
| 25 | ?C: double. Usual values are 2, 4 and 8. |
| 26 | ?C:. |
| 27 | ?H:#define MEM_ALIGNBYTES $memalignbytes /**/ |
| 28 | ?H:. |
| 29 | : check for alignment requirements |
| 30 | echo " " |
| 31 | case "$memalignbytes" in |
| 32 | '') echo "Checking alignment constraints..." >&4 |
| 33 | $cat >try.c <<'EOCP' |
| 34 | struct foobar { |
| 35 | char foo; |
| 36 | double bar; |
| 37 | } try; |
| 38 | main() |
| 39 | { |
| 40 | printf("%d\n", (char *)&try.bar - (char *)&try.foo); |
| 41 | } |
| 42 | EOCP |
| 43 | if $cc $ccflags try.c -o try >/dev/null 2>&1; then |
| 44 | dflt=`./try` |
| 45 | else |
| 46 | dflt='8' |
| 47 | echo"(I can't seem to compile the test program...)" |
| 48 | fi |
| 49 | ;; |
| 50 | *) dflt="$memalignbytes" |
| 51 | ;; |
| 52 | esac |
| 53 | rp="Doubles must be aligned on a how-many-byte boundary?" |
| 54 | . ./myread |
| 55 | memalignbytes="$ans" |
| 56 | $rm -f try.c try |
| 57 | |
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