1 ?RCS: $Id: voidflags.U,v 3.0.1.2 1997/02/28 16:27:58 ram Exp $
3 ?RCS: Copyright (c) 1991-1993, Raphael Manfredi
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.
11 ?RCS: $Log: voidflags.U,v $
12 ?RCS: Revision 3.0.1.2 1997/02/28 16:27:58 ram
13 ?RCS: patch61: don't prompt them if the void support is high enough for us
15 ?RCS: Revision 3.0.1.1 1995/01/11 15:37:44 ram
16 ?RCS: patch45: cosmetic change to avoid spurious blank lines when using -s
18 ?RCS: Revision 3.0 1993/08/18 12:10:01 ram
19 ?RCS: Baseline for dist 3.0 netwide release.
21 ?MAKE:voidflags defvoidused: cat rm contains +cc +ccflags package \
23 ?MAKE: -pick add $@ %<
25 ?S: This variable contains the eventual value of the VOIDFLAGS symbol,
26 ?S: which indicates how much support of the void type is given by this
27 ?S: compiler. See VOIDFLAGS for more info.
29 ?X: Exceptionally, we have to explicitely alias the symbol name for
30 ?X: config_h.SH, otherwise the comment would not appear.
32 ?C: This symbol indicates how much support of the void type is given by this
33 ?C: compiler. What various bits mean:
35 ?C: 1 = supports declaration of void
36 ?C: 2 = supports arrays of pointers to functions returning void
37 ?C: 4 = supports comparisons between pointers to void functions and
38 ?C: addresses of void functions
39 ?C: 8 = suports declaration of generic void pointers
41 ?C: The package designer should define VOIDUSED to indicate the requirements
42 ?C: of the package. This can be done either by #defining VOIDUSED before
43 ?C: including config.h, or by defining defvoidused in Myinit.U. If the
44 ?C: latter approach is taken, only those flags will be tested. If the
45 ?C: level of void support necessary is not present, defines void to int.
47 ?H:?%<:#ifndef VOIDUSED
48 ?H:?%<:#define VOIDUSED $defvoidused
50 ?H:?%<:#define VOIDFLAGS $voidflags
51 ?H:?%<:#if (VOIDFLAGS & VOIDUSED) != VOIDUSED
52 ?H:?%<:#define void int /* is void to be avoided? */
53 ?H:?%<:#define M_VOID /* Xenix strikes again */
57 ?INIT:: full support for void wanted by default
60 ?LINT:describe defvoidused
61 ?LINT:known void M_VOID VOIDUSED
64 echo "Checking to see how well your C compiler groks the void type..." >&4
67 Support flag bits are:
68 1: basic void declarations.
69 2: arrays of pointers to functions returning void.
70 4: operations between pointers to and addresses of void functions.
71 8: generic void pointers.
82 extern void moo(); /* function returning void */
83 void (*goo)(); /* ptr to func returning void */
85 void *hue; /* generic ptr */
100 ?X: This unit used to use cc -S in those tests to try to speed up things, but
101 ?X: unfortunately, AIX 3.2 does not support this option.
102 if $cc $ccflags -c -DTRY=$defvoidused try.c >.out 2>&1 ; then
103 voidflags=$defvoidused
104 echo "It appears to support void to the level $package wants ($defvoidused)."
105 if $contains warning .out >/dev/null 2>&1; then
106 echo "However, you might get some warnings that look like this:"
110 echo "Hmm, your compiler has some difficulty with void. Checking further..." >&4
111 if $cc $ccflags -c -DTRY=1 try.c >/dev/null 2>&1; then
112 echo "It supports 1..."
113 if $cc $ccflags -c -DTRY=3 try.c >/dev/null 2>&1; then
114 echo "It also supports 2..."
115 if $cc $ccflags -c -DTRY=7 try.c >/dev/null 2>&1; then
117 echo "And it supports 4 but not 8 definitely."
119 echo "It doesn't support 4..."
120 if $cc $ccflags -c -DTRY=11 try.c >/dev/null 2>&1; then
122 echo "But it supports 8."
125 echo "Neither does it support 8."
129 echo "It does not support 2..."
130 if $cc $ccflags -c -DTRY=13 try.c >/dev/null 2>&1; then
132 echo "But it supports 4 and 8."
134 if $cc $ccflags -c -DTRY=5 try.c >/dev/null 2>&1; then
136 echo "And it supports 4 but has not heard about 8."
138 echo "However it supports 8 but not 4."
143 echo "There is no support at all for void."
148 ?X: Only prompt user if support does not match the level we want
153 rp="Your void support flags add up to what?"