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[metaconfig.git] / U / modified / mallocsrc.U

?RCS: $Id: mallocsrc.U,v 3.0.1.2 1997/02/28 16:10:26 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: mallocsrc.U,v $
?RCS: Revision 3.0.1.2  1997/02/28  16:10:26  ram
?RCS: patch61: added support for Free_t, the type of free()
?RCS: patch61: replaced .o with $_o all over the place
?RCS:
?RCS: Revision 3.0.1.1  1994/05/06  15:10:46  ram
?RCS: patch23: added support for MYMALLOC, mainly  for perl5 (ADO)
?RCS:
?RCS: Revision 3.0  1993/08/18  12:09:12  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:mallocsrc mallocobj usemallocwrap usemymalloc malloctype d_mymalloc \
	freetype: Myread \
	Oldconfig package Guess Setvar rm cat +cc +ccflags Findhdr \
	i_malloc i_stdlib sed libs _o ptrsize
?MAKE:	-pick add $@ %<
?X: Put near top so that other tests don't erroneously include
?X: -lmalloc.  --AD  22 June 1998
?Y:TOP
?S:usemymalloc:
?S:	This variable contains y if the malloc that comes with this package
?S:	is desired over the system's version of malloc.  People often include
?S:	special versions of malloc for effiency, but such versions are often
?S:	less portable.  See also mallocsrc and mallocobj.
?S:	If this is 'y', then -lmalloc is removed from $libs.
?S:.
?S:usemallocwrap:
?S:	This variable contains y if we are wrapping malloc to prevent
?S:	integer overflow during size calculations.
?S:.
?S:mallocsrc:
?S:	This variable contains the name of the malloc.c that comes with
?S:	the package, if that malloc.c is preferred over the system malloc.
?S:	Otherwise the value is null.  This variable is intended for generating
?S:	Makefiles.
?S:.
?S:d_mymalloc:
?S:	This variable conditionally defines MYMALLOC in case other parts
?S:	of the source want to take special action if MYMALLOC is used.
?S:	This may include different sorts of profiling or error detection.
?S:.
?S:mallocobj:
?S:	This variable contains the name of the malloc.o that this package
?S:	generates, if that malloc.o is preferred over the system malloc.
?S:	Otherwise the value is null.  This variable is intended for generating
?S:	Makefiles.  See mallocsrc.
?S:.
?S:freetype:
?S:	This variable contains the return type of free().  It is usually
?S: void, but occasionally int.
?S:.
?S:malloctype:
?S:	This variable contains the kind of ptr returned by malloc and realloc.
?S:.
?C:Free_t:
?C:	This variable contains the return type of free().  It is usually
?C: void, but occasionally int.
?C:.
?C:Malloc_t (MALLOCPTRTYPE):
?C:	This symbol is the type of pointer returned by malloc and realloc.
?C:.
?H:#define Malloc_t $malloctype			/**/
?H:#define Free_t $freetype			/**/
?H:.
?C:PERL_MALLOC_WRAP:
?C:	This symbol, if defined, indicates that we'd like malloc wrap checks.
?C:.
?H:#$usemallocwrap PERL_MALLOC_WRAP		/**/
?H:.
?C:MYMALLOC:
?C:	This symbol, if defined, indicates that we're using our own malloc.
?C:.
?H:#$d_mymalloc MYMALLOC			/**/
?H:.
?LINT:extern usedevel
?LINT:change usedevel
?LINT:change libs
?X: Cannot test for mallocsrc; it is the unit's name and there is a bug in
?X: the interpreter which defines all the names, even though they are not used.
@if mallocobj
: determine whether to use malloc wrapping
echo " "
case "$usemallocwrap" in
[yY]*|true|$define)	dflt='y' ;;
[nN]*|false|$undef)	dflt='n' ;;
*)	case "$usedevel" in
	[yY]*|true|$define)	dflt='y' ;;
	*) dflt='n' ;;
	esac
	;;
esac
rp="Do you wish to wrap malloc calls to protect against potential overflows?"
. ./myread
usemallocwrap="$ans"
case "$ans" in
y*|true)
	usemallocwrap="$define" ;;
*)
	usemallocwrap="$undef" ;;
esac

: determine which malloc to compile in
echo " "
case "$usemymalloc" in
[yY]*|true|$define)	dflt='y' ;;
[nN]*|false|$undef)	dflt='n' ;;
*)	case "$ptrsize" in
	4) dflt='y' ;;
	*) dflt='n' ;;
	esac
	;;
esac
rp="Do you wish to attempt to use the malloc that comes with $package?"
. ./myread
usemymalloc="$ans"
case "$ans" in
y*|true)
	usemymalloc='y'
	mallocsrc='malloc.c'
	mallocobj="malloc$_o"
	d_mymalloc="$define"
?X:	Maybe libs.U should be dependent on mallocsrc.U, but then
?X:	most packages that use dist probably don't supply their own
?X:	malloc, so this is probably an o.k. comprpomise
	case "$libs" in
	*-lmalloc*)
		: Remove malloc from list of libraries to use
		echo "Removing unneeded -lmalloc from library list" >&4
		set `echo X $libs | $sed -e 's/-lmalloc / /' -e 's/-lmalloc$//'`
		shift
		libs="$*"
		echo "libs = $libs" >&4
		;;
	esac
	;;
*)
	usemymalloc='n'
	mallocsrc=''
	mallocobj=''
	d_mymalloc="$undef"
	;;
esac

@end
@if MALLOCPTRTYPE || Malloc_t || Free_t
: compute the return types of malloc and free
echo " "
$cat >malloc.c <<END
#$i_malloc I_MALLOC
#$i_stdlib I_STDLIB
#include <stdio.h>
#include <sys/types.h>
#ifdef I_MALLOC
#include <malloc.h>
#endif
#ifdef I_STDLIB
#include <stdlib.h>
#endif
#ifdef TRY_MALLOC
void *malloc();
#endif
#ifdef TRY_FREE
void free();
#endif
END
@if MALLOCPTRTYPE || Malloc_t
case "$malloctype" in
'')
	if $cc $ccflags -c -DTRY_MALLOC malloc.c >/dev/null 2>&1; then
		malloctype='void *'
	else
		malloctype='char *'
	fi
	;;
esac
echo "Your system wants malloc to return '$malloctype', it would seem." >&4
@end

@if Free_t
case "$freetype" in
'')
	if $cc $ccflags -c -DTRY_FREE malloc.c >/dev/null 2>&1; then
		freetype='void'
	else
		freetype='int'
	fi
	;;
esac
echo "Your system uses $freetype free(), it would seem." >&4
@end
$rm -f malloc.[co]
@end