From f47d809c449a105b77fbc5fc6f058b24f8537a94 Mon Sep 17 00:00:00 2001
From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Wed, 1 Aug 2012 12:46:51 +0100
Subject: tools/config: Allow building of components to be controlled from
 .config

For build systems which build certain Xen components separately, allow certain
components to be conditionally built based on .config, rather than always
building them.

This patch allows qemu and blktap to be configured in this manner.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
---
 tools/Rules.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'tools/Rules.mk')

diff --git a/tools/Rules.mk b/tools/Rules.mk
index 2dd8ed3913..f4e84c1b77 100644
--- a/tools/Rules.mk
+++ b/tools/Rules.mk
@@ -40,9 +40,9 @@ LDLIBS_libxenvchan = $(SHLIB_libxenctrl) $(SHLIB_libxenstore) -L$(XEN_LIBVCHAN)
 SHLIB_libxenvchan  = -Wl,-rpath-link=$(XEN_LIBVCHAN)
 
 ifeq ($(CONFIG_Linux),y)
-LIBXL_BLKTAP = y
+LIBXL_BLKTAP ?= y
 else
-LIBXL_BLKTAP = n
+LIBXL_BLKTAP ?= n
 endif
 
 ifeq ($(LIBXL_BLKTAP),y)
-- 
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