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

?RCS: $Id: i_varhdr.U,v 3.0.1.3 1997/02/28 15:54:42 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: i_varhdr.U,v $
?RCS: Revision 3.0.1.3  1997/02/28  15:54:42  ram
?RCS: patch61: varargs script now starts with leading "startsh"
?RCS:
?RCS: Revision 3.0.1.2  1994/10/29  16:21:02  ram
?RCS: patch36: added ?F: line for metalint file checking
?RCS:
?RCS: Revision 3.0.1.1  1994/05/13  15:26:05  ram
?RCS: patch27: this unit now supersedes old i_stdarg.U and i_varargs.U
?RCS: patch27: modified to avoid spurious Whoa warnings (ADO)
?RCS:
?RCS: Revision 3.0  1993/08/18  12:08:49  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:i_stdarg i_varargs i_varhdr: cat +cc +ccflags rm test Setvar \
	Findhdr startsh _o run
?MAKE:	-pick add $@ %<
?S:i_stdarg:
?S:	This variable conditionally defines the I_STDARG symbol, which
?S:	indicates to the C program that <stdarg.h> exists and should
?S:	be included.
?S:.
?S:i_varargs:
?S:	This variable conditionally defines I_VARARGS, which indicates
?S:	to the C program that it should include <varargs.h>.
?S:.
?S:i_varhdr:
?S:	Contains the name of the header to be included to get va_dcl definition.
?S:	Typically one of varargs.h or stdarg.h.
?S:.
?C:I_STDARG:
?C:	This symbol, if defined, indicates that <stdarg.h> exists and should
?C:	be included.
?C:.
?C:I_VARARGS:
?C:	This symbol, if defined, indicates to the C program that it should
?C:	include <varargs.h>.
?C:.
?H:#$i_stdarg I_STDARG		/**/
?H:#$i_varargs I_VARARGS	/**/
?H:.
?W:%<:va_dcl
?T:valstd
?F:!varargs
?LINT:set i_stdarg i_varargs
?X:
?X: Don't use setvar because the varags test below might override these.
?X: Actually, the messages here are just informative. We don't wish to set
?X: i_varargs or i_stdarg to their final value before knowing which of the
?X: two we'll include.
?X:
: see if stdarg is available
echo " "
if $test `./findhdr stdarg.h`; then
	echo "<stdarg.h> found." >&4
	valstd="$define"
else
	echo "<stdarg.h> NOT found." >&4
	valstd="$undef"
fi

: see if varags is available
echo " "
if $test `./findhdr varargs.h`; then
	echo "<varargs.h> found." >&4
else
	echo "<varargs.h> NOT found, but that's ok (I hope)." >&4
fi

?X:
?X: if you have stdarg.h, you need to support prototypes to actually use it;
?X: but if stdarg.h exists and the compiler doesn't support prototypes (for some
?X: bizarre reason), we'll fall back to varargs.h anyway so it's not so bad.
?X:
: set up the varargs testing programs
$cat > varargs.c <<EOP
#ifdef I_STDARG
#include <stdarg.h>
#endif
#ifdef I_VARARGS
#include <varargs.h>
#endif

#ifdef I_STDARG
int f(char *p, ...)
#else
int f(va_alist)
va_dcl
#endif
{
	va_list ap;
#ifndef I_STDARG
	char *p;
#endif
#ifdef I_STDARG
	va_start(ap,p);
#else
	va_start(ap);
	p = va_arg(ap, char *);
#endif
	va_end(ap);
	return 0;
}
EOP
$cat > varargs <<EOP
$startsh
if $cc -c $ccflags -D\$1 varargs.c >/dev/null 2>&1; then
	echo "true"
else
	echo "false"
fi
$rm -f varargs$_o
EOP
chmod +x varargs

: now check which varargs header should be included
echo " "
i_varhdr=''
case "$valstd" in
"$define")
	if `./varargs I_STDARG`; then
		val='stdarg.h'
	elif `./varargs I_VARARGS`; then
		val='varargs.h'
	fi
	;;
*)
	if `./varargs I_VARARGS`; then
		val='varargs.h'
	fi
	;;
esac
case "$val" in
'')
echo "I could not find the definition for va_dcl... You have problems..." >&4
	val="$undef"; set i_stdarg; eval $setvar
	val="$undef"; set i_varargs; eval $setvar
	;;
*) 
	set i_varhdr
	eval $setvar
	case "$i_varhdr" in
	stdarg.h)
		val="$define"; set i_stdarg; eval $setvar
		val="$undef"; set i_varargs; eval $setvar
		;;
	varargs.h)
		val="$undef"; set i_stdarg; eval $setvar
		val="$define"; set i_varargs; eval $setvar
		;;
	esac
	echo "We'll include <$i_varhdr> to get va_dcl definition." >&4;;
esac
$rm -f varargs*