makepkg: check for package functions when package splitting

Makes sure the required package functions are present when using package
splitting.  Also moves setting of pkgbase variable outside the
check_sanity function to somewhere more appropriate.

Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/makepkg.sh.in

@@ -1135,9 +1135,6 @@ check_sanity() {
 	if [ "$arch" = 'any' ]; then
 		CARCH='any'
 	fi
-
-	pkgbase=${pkgbase:-${pkgname[0]}}
-
 	if ! in_array $CARCH ${arch[@]}; then
 		if [ "$IGNOREARCH" -eq 0 ]; then
 			error "$(gettext "%s is not available for the '%s' architecture.")" "$pkgbase" "$CARCH"
@@ -1179,6 +1176,15 @@ check_sanity() {
 		return 1
 	fi
 
+	if [ "${#pkgname[@]}" -gt "1" ]; then
+		for pkg in ${pkgname[@]}; do
+			if [ "$(type -t package_${pkg})" != "function" ]; then
+				error "$(gettext "missing package function for split package '%s'")" "$pkg"
+				return 1
+			fi
+		done
+	fi
+
 	return 0
 }
 
@@ -1655,6 +1661,8 @@ if [ "${#pkgname[@]}" -gt "1" ]; then
 	SPLITPKG=1
 fi
 
+pkgbase=${pkgbase:-${pkgname[0]}}
+
 if [ "$SPLITPKG" -eq 0 ]; then
 	if [ -f "$PKGDEST/${pkgname}-${pkgver}-${pkgrel}-${CARCH}${PKGEXT}" \
 			-a "$FORCE" -eq 0 -a "$SOURCEONLY" -eq 0 -a "$NOBUILD" -eq 0 ]; then