From 6f9b62ca57322197e26d3b22ff11b629697142bd Mon Sep 17 00:00:00 2001
From: Wei Liu <wei.liu2@citrix.com>
Date: Fri, 14 Oct 2016 18:02:31 +0100
Subject: [PATCH] libacpi: require ACPI_BUILD_DIR to be set

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

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>
---
 tools/libacpi/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/libacpi/Makefile b/tools/libacpi/Makefile
index ee8c09506f..18a5cd43b8 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
-- 
2.30.2