[Xen-devel] [PATCH for-4.8 2/3] libacpi: require ACPI_BUILD_DIR to be set

[Wei Liu <wei.liu2@xxxxxxxxxx>]

It's better to have a explicit error than a build failure returned by
gcc.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Cc: Jan Beulich <JBeulich@xxxxxxxx>
---
 tools/libacpi/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/libacpi/Makefile b/tools/libacpi/Makefile
index 24eb0c2..c1f0af8 100644
--- a/tools/libacpi/Makefile
+++ b/tools/libacpi/Makefile
@@ -15,6 +15,10 @@
 XEN_ROOT = $(CURDIR)/../..
 include $(XEN_ROOT)/tools/Rules.mk
 
+ifeq ($(ACPI_BUILD_DIR),)
+$(error ACPI_BUILD_DIR not set)
+endif
+
 MK_DSDT = $(ACPI_BUILD_DIR)/mk_dsdt
 
 C_SRC-$(GPL) = dsdt_anycpu.c dsdt_15cpu.c dsdt_anycpu_qemu_xen.c
-- 
2.1.4


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