[metaconfig.git] / dist / U / voidflags.U

?RCS: $Id: voidflags.U 1 2006-08-24 12:32:52Z rmanfredi $
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, 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 4.0.
?RCS:
?RCS: $Log: voidflags.U,v $
?RCS: Revision 3.0.1.2  1997/02/28  16:27:58  ram
?RCS: patch61: don't prompt them if the void support is high enough for us
?RCS:
?RCS: Revision 3.0.1.1  1995/01/11  15:37:44  ram
?RCS: patch45: cosmetic change to avoid spurious blank lines when using -s
?RCS:
?RCS: Revision 3.0  1993/08/18  12:10:01  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:voidflags defvoidused: cat sed rm contains +cc +ccflags package \
	Oldconfig Myread
?MAKE:	-pick add $@ %<
?S:voidflags:
?S:	This variable contains the eventual value of the VOIDFLAGS symbol,
?S:	which indicates how much support of the void type is given by this
?S:	compiler.  See VOIDFLAGS for more info.
?S:.
?S:defvoidused:
?S:	This variable contains the default value of the VOIDUSED symbol (15).
?S:.
?X:	Exceptionally, we have to explicitly alias the symbol name for
?X: config_h.SH, otherwise the comment would not appear.
?C:VOIDFLAGS ~ %<:
?C:	This symbol indicates how much support of the void type is given by this
?C:	compiler.  What various bits mean:
?C:
?C:	    1 = supports declaration of void
?C:	    2 = supports arrays of pointers to functions returning void
?C:	    4 = supports comparisons between pointers to void functions and
?C:		    addresses of void functions
?C:	    8 = suports declaration of generic void pointers
?C:
?C:	The package designer should define VOIDUSED to indicate the requirements
?C:	of the package.  This can be done either by #defining VOIDUSED before
?C:	including config.h, or by defining defvoidused in Myinit.U.  If the
?C:	latter approach is taken, only those flags will be tested.  If the
?C:	level of void support necessary is not present, defines void to int.
?C:.
?H:?%<:#ifndef VOIDUSED
?H:?%<:#define VOIDUSED $defvoidused
?H:?%<:#endif
?H:?%<:#define VOIDFLAGS $voidflags
?H:?%<:#if (VOIDFLAGS & VOIDUSED) != VOIDUSED
?H:?%<:#define void int		/* is void to be avoided? */
?H:?%<:#define M_VOID			/* Xenix strikes again */
?H:?%<:#endif
?H:.
?W:%<:void
?F:!.out !try.c !flags
?LINT:usefile .out flags try.c
?INIT:: full support for void wanted by default
?INIT:defvoidused=15
?INIT:
?LINT:known void M_VOID VOIDUSED
: check for void type
echo " "
echo "Checking to see how well your C compiler groks the void type..." >&4
$cat >flags <<EOM

  Support flag bits are:
    1: basic void declarations.
    2: arrays of pointers to functions returning void.
    4: operations between pointers to and addresses of void functions.
    8: generic void pointers.

EOM
case "$voidflags" in
'')
	$cat >try.c <<'EOCP'
#if TRY & 1
void sub() {
#else
sub() {
#endif
	extern void moo();	/* function returning void */
	void (*goo)();		/* ptr to func returning void */
#if TRY & 8
	void *hue;		/* generic ptr */
#endif
#if TRY & 2
	void (*foo[10])();
#endif

#if TRY & 4
	if(goo == moo) {
		exit(0);
	}
#endif
	exit(0);
}
int main() { sub(); }
EOCP
?X: This unit used to use cc -S in those tests to try to speed up things, but
?X: unfortunately, AIX 3.2 does not support this option.
	if $cc $ccflags -c -DTRY=$defvoidused try.c >.out 2>&1 ; then
		voidflags=$defvoidused
		echo "Good.  It appears to support void to the level $package wants."
		if $contains warning .out >/dev/null 2>&1; then
			echo "However, you might get some warnings that look like this:"
			$sed -e 's/^/	/' .out
		fi
	else
echo "Hmm, your compiler has some difficulty with void. Checking further..." >&4
		$cat >&4 flags
		$rm -f flags
		if $cc $ccflags -c -DTRY=1 try.c >/dev/null 2>&1; then
			echo "It supports 1..."
			if $cc $ccflags -c -DTRY=3 try.c >/dev/null 2>&1; then
				echo "It also supports 2..."
				if $cc $ccflags -c -DTRY=7 try.c >/dev/null 2>&1; then
					voidflags=7
					echo "And it supports 4 but not 8 definitely."
				else
					echo "It doesn't support 4..."
					if $cc $ccflags -c -DTRY=11 try.c >/dev/null 2>&1; then
						voidflags=11
						echo "But it supports 8."
					else
						voidflags=3
						echo "Neither does it support 8."
					fi
				fi
			else
				echo "It does not support 2..."
				if $cc $ccflags -c -DTRY=13 try.c >/dev/null 2>&1; then
					voidflags=13
					echo "But it supports 4 and 8."
				else
					if $cc $ccflags -c -DTRY=5 try.c >/dev/null 2>&1; then
						voidflags=5
						echo "And it supports 4 but has not heard about 8."
					else
						echo "However it supports 8 but not 4."
					fi
				fi
			fi
		else
			echo "There is no support at all for void."
			voidflags=0
		fi
	fi
esac
?X: Only prompt user if support does not match the level we want
case "$voidflags" in
"$defvoidused")
	echo "Good.  I already know it supports void to the level $package wants."
	;;
*)
	dflt="$voidflags";
	test -f flags && $cat flags
	rp="Your void support flags add up to what?"
	. ./myread
	voidflags="$ans"
	;;
esac
$rm -f try.* .out flags
Commit	Line	Data
d8875586 MBT	1	?RCS: $Id: voidflags.U 1 2006-08-24 12:32:52Z rmanfredi $
	2	?RCS:
	3	?RCS: Copyright (c) 1991-1997, 2004-2006, 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 4.0.
	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 sed rm contains +cc +ccflags package \
	22	Oldconfig Myread
	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 explicitly 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
	60	?F:!.out !try.c !flags
	61	?LINT:usefile .out flags try.c
	62	?INIT:: full support for void wanted by default
	63	?INIT:defvoidused=15
	64	?INIT:
65	?LINT:known void M_VOID VOIDUSED
66	: check for void type
67	echo " "
68	echo "Checking to see how well your C compiler groks the void type..." >&4
69	$cat >flags <<EOM
70
71	Support flag bits are:
72	1: basic void declarations.
73	2: arrays of pointers to functions returning void.
74	4: operations between pointers to and addresses of void functions.
75	8: generic void pointers.
76
77	EOM
78	case "$voidflags" in
79	'')
80	$cat >try.c <<'EOCP'
81	#if TRY & 1
82	void sub() {
83	#else
84	sub() {
85	#endif
86	extern void moo(); /* function returning void */
87	void (goo)(); / ptr to func returning void */
88	#if TRY & 8
89	void hue; / generic ptr */
90	#endif
91	#if TRY & 2
92	void (*foo[10])();
93	#endif
94
95	#if TRY & 4
96	if(goo == moo) {
97	exit(0);
98	}
99	#endif
100	exit(0);
101	}
102	int main() { sub(); }
103	EOCP
104	?X: This unit used to use cc -S in those tests to try to speed up things, but
105	?X: unfortunately, AIX 3.2 does not support this option.
106	if $cc $ccflags -c -DTRY=$defvoidused try.c >.out 2>&1 ; then
107	voidflags=$defvoidused
108	echo "Good. It appears to support void to the level $package wants."
109	if $contains warning .out >/dev/null 2>&1; then
110	echo "However, you might get some warnings that look like this:"
111	$sed -e 's/^/ /' .out
112	fi
113	else
114	echo "Hmm, your compiler has some difficulty with void. Checking further..." >&4
115	$cat >&4 flags
116	$rm -f flags
117	if $cc $ccflags -c -DTRY=1 try.c >/dev/null 2>&1; then
118	echo "It supports 1..."
119	if $cc $ccflags -c -DTRY=3 try.c >/dev/null 2>&1; then
120	echo "It also supports 2..."
121	if $cc $ccflags -c -DTRY=7 try.c >/dev/null 2>&1; then
122	voidflags=7
123	echo "And it supports 4 but not 8 definitely."
124	else
125	echo "It doesn't support 4..."
126	if $cc $ccflags -c -DTRY=11 try.c >/dev/null 2>&1; then
127	voidflags=11
128	echo "But it supports 8."
129	else
130	voidflags=3
131	echo "Neither does it support 8."
132	fi
133	fi
134	else
135	echo "It does not support 2..."
136	if $cc $ccflags -c -DTRY=13 try.c >/dev/null 2>&1; then
137	voidflags=13
138	echo "But it supports 4 and 8."
139	else
140	if $cc $ccflags -c -DTRY=5 try.c >/dev/null 2>&1; then
141	voidflags=5
142	echo "And it supports 4 but has not heard about 8."
143	else
144	echo "However it supports 8 but not 4."
145	fi
146	fi
147	fi
148	else
149	echo "There is no support at all for void."
150	voidflags=0
151	fi
152	fi
153	esac
154	?X: Only prompt user if support does not match the level we want
155	case "$voidflags" in
156	"$defvoidused")
157	echo "Good. I already know it supports void to the level $package wants."
158	;;
159	*)
160	dflt="$voidflags";
161	test -f flags && $cat flags
162	rp="Your void support flags add up to what?"
163	. ./myread
164	voidflags="$ans"
165	;;
166	esac
167	$rm -f try.* .out flags
168