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959f3c4c JH |
1 | ?RCS: $Id: voidflags.U,v 3.0.1.2 1997/02/28 16:27:58 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: 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 | |
14 | ?RCS: | |
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 | |
17 | ?RCS: | |
18 | ?RCS: Revision 3.0 1993/08/18 12:10:01 ram | |
19 | ?RCS: Baseline for dist 3.0 netwide release. | |
20 | ?RCS: | |
21 | ?MAKE:voidflags defvoidused: cat rm contains +cc +ccflags package \ | |
3b148aa9 | 22 | Oldconfig Myread i_stdlib |
959f3c4c JH |
23 | ?MAKE: -pick add $@ %< |
24 | ?S:voidflags: | |
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. | |
28 | ?S:. | |
29 | ?S:defvoidused: | |
30 | ?S: This variable contains the default value of the VOIDUSED symbol (15). | |
31 | ?S:. | |
32 | ?X: Exceptionally, we have to explicitely alias the symbol name for | |
33 | ?X: config_h.SH, otherwise the comment would not appear. | |
34 | ?C:VOIDFLAGS ~ %<: | |
35 | ?C: This symbol indicates how much support of the void type is given by this | |
36 | ?C: compiler. What various bits mean: | |
37 | ?C: | |
38 | ?C: 1 = supports declaration of void | |
39 | ?C: 2 = supports arrays of pointers to functions returning void | |
40 | ?C: 4 = supports comparisons between pointers to void functions and | |
41 | ?C: addresses of void functions | |
42 | ?C: 8 = suports declaration of generic void pointers | |
43 | ?C: | |
44 | ?C: The package designer should define VOIDUSED to indicate the requirements | |
45 | ?C: of the package. This can be done either by #defining VOIDUSED before | |
46 | ?C: including config.h, or by defining defvoidused in Myinit.U. If the | |
47 | ?C: latter approach is taken, only those flags will be tested. If the | |
48 | ?C: level of void support necessary is not present, defines void to int. | |
49 | ?C:. | |
50 | ?H:?%<:#ifndef VOIDUSED | |
51 | ?H:?%<:#define VOIDUSED $defvoidused | |
52 | ?H:?%<:#endif | |
53 | ?H:?%<:#define VOIDFLAGS $voidflags | |
54 | ?H:?%<:#if (VOIDFLAGS & VOIDUSED) != VOIDUSED | |
55 | ?H:?%<:#define void int /* is void to be avoided? */ | |
56 | ?H:?%<:#define M_VOID /* Xenix strikes again */ | |
57 | ?H:?%<:#endif | |
58 | ?H:. | |
59 | ?W:%<:void | |
bf7497fb MB |
60 | ?INIT:: full support for void wanted by default |
61 | ?INIT:defvoidused=15 | |
62 | ?INIT: | |
959f3c4c JH |
63 | ?LINT:describe defvoidused |
64 | ?LINT:known void M_VOID VOIDUSED | |
65 | : check for void type | |
66 | echo " " | |
67 | echo "Checking to see how well your C compiler groks the void type..." >&4 | |
68 | case "$voidflags" in | |
69 | '') | |
38122f24 | 70 | $cat >try.c <<EOCP |
3b148aa9 JH |
71 | #$i_stdlib I_STDLIB |
72 | #ifdef I_STDLIB | |
73 | #include <stdlib.h> | |
74 | #endif | |
959f3c4c JH |
75 | #if TRY & 1 |
76 | void sub() { | |
77 | #else | |
78 | sub() { | |
79 | #endif | |
80 | extern void moo(); /* function returning void */ | |
81 | void (*goo)(); /* ptr to func returning void */ | |
82 | #if TRY & 8 | |
83 | void *hue; /* generic ptr */ | |
84 | #endif | |
85 | #if TRY & 2 | |
86 | void (*foo[10])(); | |
87 | #endif | |
88 | ||
89 | #if TRY & 4 | |
90 | if(goo == moo) { | |
91 | exit(0); | |
92 | } | |
93 | #endif | |
94 | exit(0); | |
95 | } | |
96 | int main() { sub(); } | |
97 | EOCP | |
98 | ?X: This unit used to use cc -S in those tests to try to speed up things, but | |
99 | ?X: unfortunately, AIX 3.2 does not support this option. | |
100 | if $cc $ccflags -c -DTRY=$defvoidused try.c >.out 2>&1 ; then | |
101 | voidflags=$defvoidused | |
102 | echo "Good. It appears to support void to the level $package wants.">&4 | |
103 | if $contains warning .out >/dev/null 2>&1; then | |
104 | echo "However, you might get some warnings that look like this:" | |
105 | $cat .out | |
106 | fi | |
107 | else | |
108 | echo "Hmm, your compiler has some difficulty with void. Checking further..." >&4 | |
109 | if $cc $ccflags -c -DTRY=1 try.c >/dev/null 2>&1; then | |
110 | echo "It supports 1..." | |
111 | if $cc $ccflags -c -DTRY=3 try.c >/dev/null 2>&1; then | |
112 | echo "It also supports 2..." | |
113 | if $cc $ccflags -c -DTRY=7 try.c >/dev/null 2>&1; then | |
114 | voidflags=7 | |
115 | echo "And it supports 4 but not 8 definitely." | |
116 | else | |
117 | echo "It doesn't support 4..." | |
118 | if $cc $ccflags -c -DTRY=11 try.c >/dev/null 2>&1; then | |
119 | voidflags=11 | |
120 | echo "But it supports 8." | |
121 | else | |
122 | voidflags=3 | |
123 | echo "Neither does it support 8." | |
124 | fi | |
125 | fi | |
126 | else | |
127 | echo "It does not support 2..." | |
128 | if $cc $ccflags -c -DTRY=13 try.c >/dev/null 2>&1; then | |
129 | voidflags=13 | |
130 | echo "But it supports 4 and 8." | |
131 | else | |
132 | if $cc $ccflags -c -DTRY=5 try.c >/dev/null 2>&1; then | |
133 | voidflags=5 | |
134 | echo "And it supports 4 but has not heard about 8." | |
135 | else | |
136 | echo "However it supports 8 but not 4." | |
137 | fi | |
138 | fi | |
139 | fi | |
140 | else | |
141 | echo "There is no support at all for void." | |
142 | voidflags=0 | |
143 | fi | |
144 | fi | |
145 | esac | |
146 | ?X: Only prompt user if support does not match the level we want | |
147 | case "$voidflags" in | |
148 | "$defvoidused") ;; | |
149 | *) $cat >&4 <<'EOM' | |
150 | Support flag bits are: | |
151 | 1: basic void declarations. | |
152 | 2: arrays of pointers to functions returning void. | |
153 | 4: operations between pointers to and addresses of void functions. | |
154 | 8: generic void pointers. | |
155 | EOM | |
156 | dflt="$voidflags"; | |
157 | rp="Your void support flags add up to what?" | |
158 | . ./myread | |
159 | voidflags="$ans" | |
160 | ;; | |
161 | esac | |
162 | $rm -f try.* .out | |
163 |