#	$NetBSD: mknative.common,v 1.1 2003/11/27 00:58:26 mrg Exp $
#
# from: NetBSD: mknative,v 1.12 2003/03/05 06:17:17 mrg Exp
#
# shell-fragment common to all "mknative" scripts

bomb () {
	echo >&1 "ABORT: $*"
	exit 1
}

# usage: getvars MAKEFILE VARNAME [VARNAME...]
getvars () {
	_mf="$1"; shift
	$MAKE -f - _x_ <<EOF || bomb "getvars $_mf $* failed"
_x_:
.for var in $*
	@echo G_\${var}=\${\${var}:Q} | sed 's,$_VPATH,\$\${GNUHOSTDIST},g'
.endfor
.include "$_TMPDIR/$_mf"
EOF
}

# usage: write_c FILENAME
write_c () {
	echo '/* This file is automatically generated.  DO NOT EDIT! */' >$_TOP/$1.tmp || \
		bomb "cannot create $1"
	grep '$''NetBSD' $0 | sed 's,[#$],,g;s,.*,/* Generated from: & */,' >>$_TOP/$1.tmp
	echo '' >>$_TOP/$1.tmp
	writefile $1
}

# usage: write_mk FILENAME
write_mk () {
	echo '# This file is automatically generated.  DO NOT EDIT!' >$_TOP/$1.tmp || \
		bomb "cannot create $1"
	grep '$''NetBSD' $0 | sed 's,[#$],,g;s,.*,# Generated from: &,' >>$_TOP/$1.tmp
	echo '#' >>$_TOP/$1.tmp
	writefile $1
}

writefile () {
	sed -e 's,netbsd\(elf\)*1[0-9\.]*\(_\)*[A-Z]*,netbsd\1,' \
	    -e 's,^/\* #undef HAVE_MMAP \*/$,#define HAVE_MMAP 1,' >>$_TOP/$1.tmp

	# Compare new file, sans "generated from" comments and RCS Id, to
	# old file.  If they match, don't change anything.
	rm -f $_TMPDIR/.1 $_TMPDIR/.2
	grep -v 'Generated from:' $_TOP/$1 >$_TMPDIR/.1 2>/dev/null
	grep -v 'Generated from:' $_TOP/$1.tmp >$_TMPDIR/.2

	# will not overwrite a file that has the same content
	if cmp $_TMPDIR/.1 $_TMPDIR/.2 >/dev/null 2>&1; then
		rm -f $_TOP/$1.tmp
	else
		echo >&2 "$1 changed"
		mv -f $_TOP/$1.tmp $_TOP/$1
	fi
}