From d2e830b9b408b95df46f628f33ced3dcbd6975d8 Mon Sep 17 00:00:00 2001
From: Ying Wang <wangying@google.com>
Date: Wed, 7 Jul 2010 18:12:25 -0700
Subject: [PATCH] Enforce 64-bit build environment

We will only support 64-bit build environment from now on.

Change-Id: Ic58cb3e06e7fc9cf19a65e6c05c26f12ff9886b7
---
 core/main.mk | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/core/main.mk b/core/main.mk
index b79e2eaa6..8c9393eac 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -64,12 +64,23 @@ include $(BUILD_SYSTEM)/config.mk
 # be generated correctly
 include $(BUILD_SYSTEM)/cleanbuild.mk
 
-VERSION_CHECK_SEQUENCE_NUMBER := 1
+VERSION_CHECK_SEQUENCE_NUMBER := 2
 -include $(OUT_DIR)/versions_checked.mk
 ifneq ($(VERSION_CHECK_SEQUENCE_NUMBER),$(VERSIONS_CHECKED))
 
 $(info Checking build tools versions...)
 
+ifeq ($(BUILD_OS),linux)
+build_arch := $(shell uname -m)
+ifneq (64,$(findstring 64,$(build_arch)))
+$(warning ************************************************************)
+$(warning You are attempting to build on a 32-bit system.)
+$(warning Only 64-bit build environments are supported now.)
+$(warning ************************************************************)
+$(error stop)
+endif
+endif
+
 ifneq ($(HOST_OS),windows)
 ifneq ($(HOST_OS)-$(HOST_ARCH),darwin-ppc)
 # check for a case sensitive file system