[Xen-devel] [PATCH 2 of 5] tools/config: Allow building of components to be controlled from .config

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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@xxxxxxxxxx>

diff -r 7012e0d68f3b -r 2d5cac99caf7 config/x86_32.mk
--- a/config/x86_32.mk
+++ b/config/x86_32.mk
@@ -5,7 +5,7 @@ CONFIG_X86_$(XEN_OS) := y
 CONFIG_HVM := y
 CONFIG_MIGRATE := y
 CONFIG_XCUTILS := y
-CONFIG_IOEMU := y
+CONFIG_IOEMU ?= y
 
 CFLAGS += -m32 -march=i686
 
diff -r 7012e0d68f3b -r 2d5cac99caf7 config/x86_64.mk
--- a/config/x86_64.mk
+++ b/config/x86_64.mk
@@ -6,7 +6,7 @@ CONFIG_COMPAT := y
 CONFIG_HVM := y
 CONFIG_MIGRATE := y
 CONFIG_XCUTILS := y
-CONFIG_IOEMU := y
+CONFIG_IOEMU ?= y
 
 CFLAGS += -m64
 
diff -r 7012e0d68f3b -r 2d5cac99caf7 tools/Rules.mk
--- a/tools/Rules.mk
+++ b/tools/Rules.mk
@@ -40,9 +40,9 @@ LDLIBS_libxenvchan = $(SHLIB_libxenctrl)
 SHLIB_libxenvchan  = -Wl,-rpath-link=$(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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