golang: Add a variable for the libxl source directory

...rather than duplicating the path in several places.

Signed-off-by: George Dunlap <george.dunlap@citrix.com>
Reviewed-by: Nick Rosbrook <rosbrookn@ainfosec.com>

diff --git a/tools/golang/xenlight/Makefile b/tools/golang/xenlight/Makefile
index 37ed1358c49164a04520e9866acb28dfc7c2d810..cd0a62505fa3b3e7ee807bfb9ecdd2ec7aa0df80 100644 (file)
--- a/tools/golang/xenlight/Makefile
+++ b/tools/golang/xenlight/Makefile
@@ -9,6 +9,8 @@ GOXL_INSTALL_DIR = $(GOCODE_DIR)$(GOXL_PKG_DIR)
 
 GO ?= go
 
+LIBXL_SRC_DIR = ../../libxl
+
 .PHONY: all
 all: build
 
@@ -21,8 +23,8 @@ $(XEN_GOPATH)/src/$(XEN_GOCODE_URL)/xenlight/: xenlight.go types.gen.go helpers.
        $(INSTALL_DATA) types.gen.go $(XEN_GOPATH)$(GOXL_PKG_DIR)
        $(INSTALL_DATA) helpers.gen.go $(XEN_GOPATH)$(GOXL_PKG_DIR)
 
-%.gen.go: gengotypes.py $(XEN_ROOT)/tools/libxl/libxl_types.idl $(XEN_ROOT)/tools/libxl/idl.py
-       XEN_ROOT=$(XEN_ROOT) $(PYTHON) gengotypes.py ../../libxl/libxl_types.idl
+%.gen.go: gengotypes.py $(LIBXL_SRC_DIR)/libxl_types.idl $(LIBXL_SRC_DIR)/idl.py
+       XEN_ROOT=$(XEN_ROOT) $(PYTHON) gengotypes.py $(LIBXL_SRC_DIR)/libxl_types.idl
 
 # Go will do its own dependency checking, and not actuall go through
 # with the build if none of the input files have changed.