BaseTools: Replace ARCH with HOST_ARCH in C Makefile to avoid conflict

https://bugzilla.tianocore.org/show_bug.cgi?id=793

ARCH is too generic. It may cause confuse of target arch or host arch.
To be clarified, replace it with HOST_ARCH in BaseTools C Makefile.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/C/Makefiles/footer.makefile

@@ -13,12 +13,12 @@
 
 DEPFILES = $(OBJECTS:%.o=%.d)
 
-$(MAKEROOT)/libs-$(ARCH):
-	mkdir -p $(MAKEROOT)/libs-$(ARCH)
+$(MAKEROOT)/libs-$(HOST_ARCH):
+	mkdir -p $(MAKEROOT)/libs-$(HOST_ARCH)
 
 .PHONY: install
-install: $(MAKEROOT)/libs-$(ARCH) $(LIBRARY)
-	cp $(LIBRARY) $(MAKEROOT)/libs-$(ARCH)
+install: $(MAKEROOT)/libs-$(HOST_ARCH) $(LIBRARY)
+	cp $(LIBRARY) $(MAKEROOT)/libs-$(HOST_ARCH)
 
 $(LIBRARY): $(OBJECTS) 
 	$(BUILD_AR) crs $@ $^

BaseTools/Source/C/Makefiles/header.makefile

@@ -1,10 +1,10 @@
 ## @file
 #
 # The makefile can be invoked with
-# ARCH = x86_64 or x64 for EM64T build
-# ARCH = ia32 or IA32 for IA32 build
-# ARCH = ia64 or IA64 for IA64 build
-# ARCH = Arm or ARM for ARM build
+# HOST_ARCH = x86_64 or x64 for EM64T build
+# HOST_ARCH = ia32 or IA32 for IA32 build
+# HOST_ARCH = ia64 or IA64 for IA64 build
+# HOST_ARCH = Arm or ARM for ARM build
 #
 # Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
@@ -15,7 +15,7 @@
 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
-ARCH ?= IA32
+HOST_ARCH ?= IA32
 
 CYGWIN:=$(findstring CYGWIN, $(shell uname -s))
 LINUX:=$(findstring Linux, $(shell uname -s))
@@ -27,19 +27,19 @@ BUILD_AS ?= gcc
 BUILD_AR ?= ar
 BUILD_LD ?= ld
 LINKER ?= $(BUILD_CC)
-ifeq ($(ARCH), IA32)
+ifeq ($(HOST_ARCH), IA32)
 ARCH_INCLUDE = -I $(MAKEROOT)/Include/Ia32/
 endif
 
-ifeq ($(ARCH), X64)
+ifeq ($(HOST_ARCH), X64)
 ARCH_INCLUDE = -I $(MAKEROOT)/Include/X64/
 endif
 
-ifeq ($(ARCH), ARM)
+ifeq ($(HOST_ARCH), ARM)
 ARCH_INCLUDE = -I $(MAKEROOT)/Include/Arm/
 endif
 
-ifeq ($(ARCH), AARCH64)
+ifeq ($(HOST_ARCH), AARCH64)
 ARCH_INCLUDE = -I $(MAKEROOT)/Include/AArch64/
 endif
 
@@ -54,7 +54,7 @@ endif
 BUILD_LFLAGS =
 BUILD_CXXFLAGS = -Wno-unused-result
 
-ifeq ($(ARCH), IA32)
+ifeq ($(HOST_ARCH), IA32)
 #
 # Snow Leopard  is a 32-bit and 64-bit environment. uname -m returns i386, but gcc defaults 
 #  to x86_64. So make sure tools match uname -m. You can manual have a 64-bit kernal on Snow Leopard

BaseTools/Source/C/Makefiles/ms.common

@@ -19,8 +19,8 @@
 !ERROR "BASE_TOOLS_PATH is not set! Please run build_tools.bat at first!"
 !ENDIF
 
-!IFNDEF ARCH
-ARCH = IA32
+!IFNDEF HOST_ARCH
+HOST_ARCH = IA32
 !ENDIF
 
 MAKE        = nmake -nologo
@@ -36,7 +36,7 @@ LIB_PATH    = $(BASE_TOOLS_PATH)\Lib
 SYS_BIN_PATH=$(EDK_TOOLS_PATH)\Bin
 SYS_LIB_PATH=$(EDK_TOOLS_PATH)\Lib
 
-!IF "$(ARCH)"=="IA32"
+!IF "$(HOST_ARCH)"=="IA32"
 ARCH_INCLUDE = $(SOURCE_PATH)\Include\Ia32
 BIN_PATH     = $(BASE_TOOLS_PATH)\Bin\Win32
 LIB_PATH     = $(BASE_TOOLS_PATH)\Lib\Win32
@@ -44,7 +44,7 @@ SYS_BIN_PATH = $(EDK_TOOLS_PATH)\Bin\Win32
 SYS_LIB_PATH = $(EDK_TOOLS_PATH)\Lib\Win32
 !ENDIF
 
-!IF "$(ARCH)"=="X64"
+!IF "$(HOST_ARCH)"=="X64"
 ARCH_INCLUDE = $(SOURCE_PATH)\Include\X64
 BIN_PATH     = $(BASE_TOOLS_PATH)\Bin\Win64
 LIB_PATH     = $(BASE_TOOLS_PATH)\Lib\Win64