Added new var "build_wrksrc" for use in templates.

This var sets a relative path to $wrksrc that is used to
configure/build/install a package.

--HG--
extra : convert_revision : 690f4d435f3d4e6a9228f7f5f09ecf8b490a273a

xbps-src/shutils/build_funcs.sh

@@ -43,7 +43,8 @@ build_src_phase()
 
 	[ ! -d $wrksrc ] && msg_error "unexistent build directory [$wrksrc]"
 
-	cd $wrksrc || exit 1
+	cd $wrksrc || return 1
+	[ -n "$build_wrksrc" ] && cd $build_wrksrc || return 1
 
 	[ -n "$revision" ] && pkg="${pkg}_${revision}"
 

xbps-src/shutils/configure_funcs.sh

@@ -68,7 +68,8 @@ configure_src_phase()
 
 	[ -z "$configure_script" ] && configure_script="./configure"
 
-	cd $wrksrc || exit 1
+	cd $wrksrc || return 1
+	[ -n "$build_wrksrc" ] && cd $build_wrksrc || return 1
 
 	. $XBPS_SHUTILSDIR/buildvars_funcs.sh
 	set_build_vars

xbps-src/shutils/install_funcs.sh

@@ -71,6 +71,8 @@ install_src_phase()
 
 	saved_wrksrc=$wrksrc
 	cd $wrksrc || msg_error "can't change cwd to wrksrc!"
+	[ -n "$build_wrksrc" ] && cd $build_wrksrc \
+		|| msg_error "can't change cwd to build_wrksrc!"
 
 	# Run pre_install func.
 	run_func pre_install || msg_error "pre_install stage failed!"

xbps-src/shutils/tmpl_funcs.sh

@@ -75,7 +75,7 @@ reset_tmpl_vars()
 			only_for_archs conf_files keep_libtool_archives \
 			noarch subpackages sourcepkg gtk_iconcache_dirs \
 			abi_depends api_depends triggers openrc_services \
-			replaces system_accounts \
+			replaces system_accounts build_wrksrc \
 			XBPS_EXTRACT_DONE XBPS_CONFIGURE_DONE \
 			XBPS_BUILD_DONE XBPS_INSTALL_DONE FILESDIR DESTDIR \
 			SRCPKGDESTDIR PATCHESDIR"