[Patch] BaseTools GnuMakefile: Update GCC Flags to the specific one with BUILD_ prefix

[Liming Gao <liming.gao@intel.com>]

To avoid the conflict with the default GCC flag name, BUILD_ prefix is added.

Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
---
 BaseTools/Source/C/Makefiles/footer.makefile |  8 ++++----
 BaseTools/Source/C/Makefiles/header.makefile | 28 ++++++++++++++--------------
 BaseTools/Source/C/VfrCompile/GNUmakefile    |  4 ++--
 3 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/BaseTools/Source/C/Makefiles/footer.makefile b/BaseTools/Source/C/Makefiles/footer.makefile
index c3d8020..216ae41 100644
--- a/BaseTools/Source/C/Makefiles/footer.makefile
+++ b/BaseTools/Source/C/Makefiles/footer.makefile
@@ -21,16 +21,16 @@ install: $(MAKEROOT)/libs-$(ARCH) $(LIBRARY)
 	cp $(LIBRARY) $(MAKEROOT)/libs-$(ARCH)
 
 $(LIBRARY): $(OBJECTS) 
-	$(AR) crs $@ $^
+	$(BUILD_AR) crs $@ $^
 
 %.o : %.c 
-	$(CC)  -c $(CFLAGS) $(CPPFLAGS) $< -o $@
+	$(BUILD_CC)  -c $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $< -o $@
 
 %.o : %.S
-	$(AS) -c $(ASFLAGS) $< -o $@
+	$(BUILD_AS) -c $(BUILD_ASFLAGS) $< -o $@
 
 %.o : %.cpp
-	$(CXX)  -c $(CPPFLAGS) $< -o $@
+	$(BUILD_CXX) -c $(BUILD_CPPFLAGS) $< -o $@
 
 .PHONY: clean
 clean:
diff --git a/BaseTools/Source/C/Makefiles/header.makefile b/BaseTools/Source/C/Makefiles/header.makefile
index 09d2bff..5e79f31 100644
--- a/BaseTools/Source/C/Makefiles/header.makefile
+++ b/BaseTools/Source/C/Makefiles/header.makefile
@@ -6,7 +6,7 @@
 # ARCH = ia64 or IA64 for IA64 build
 # ARCH = Arm or ARM for ARM build
 #
-# Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.    The full text of the license may be found at
@@ -21,12 +21,12 @@ CYGWIN:=$(findstring CYGWIN, $(shell uname -s))
 LINUX:=$(findstring Linux, $(shell uname -s))
 DARWIN:=$(findstring Darwin, $(shell uname -s))
 
-CC ?= gcc
-CXX ?= g++
-AS ?= gcc
-AR ?= ar
-LD ?= ld
-LINKER ?= $(CC)
+BUILD_CC ?= gcc
+BUILD_CXX ?= g++
+BUILD_AS ?= gcc
+BUILD_AR ?= ar
+BUILD_LD ?= ld
+LINKER ?= $(BUILD_CC)
 ifeq ($(ARCH), IA32)
 ARCH_INCLUDE = -I $(MAKEROOT)/Include/Ia32/
 endif
@@ -44,14 +44,14 @@ ARCH_INCLUDE = -I $(MAKEROOT)/Include/AArch64/
 endif
 
 INCLUDE = $(TOOL_INCLUDE) -I $(MAKEROOT) -I $(MAKEROOT)/Include/Common -I $(MAKEROOT)/Include/ -I $(MAKEROOT)/Include/IndustryStandard -I $(MAKEROOT)/Common/ -I .. -I . $(ARCH_INCLUDE) 
-CPPFLAGS = $(INCLUDE)
+BUILD_CPPFLAGS = $(INCLUDE)
 ifeq ($(DARWIN),Darwin)
 # assume clang or clang compatible flags on OS X
-CFLAGS = -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-self-assign -nostdlib -c -g
+BUILD_CFLAGS = -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-self-assign -nostdlib -c -g
 else
-CFLAGS = -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -nostdlib -c -g
+BUILD_CFLAGS = -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -nostdlib -c -g
 endif
-LFLAGS =
+BUILD_LFLAGS =
 
 ifeq ($(ARCH), IA32)
 #
@@ -60,9 +60,9 @@ ifeq ($(ARCH), IA32)
 #  so only do this is uname -m returns i386.
 #
 ifeq ($(DARWIN),Darwin)
-  CFLAGS   += -arch i386
-  CPPFLAGS += -arch i386
-  LFLAGS   += -arch i386
+  BUILD_CFLAGS   += -arch i386
+  BUILD_CPPFLAGS += -arch i386
+  BUILD_LFLAGS   += -arch i386
 endif
 endif
 
diff --git a/BaseTools/Source/C/VfrCompile/GNUmakefile b/BaseTools/Source/C/VfrCompile/GNUmakefile
index e446d14..e2d4321 100644
--- a/BaseTools/Source/C/VfrCompile/GNUmakefile
+++ b/BaseTools/Source/C/VfrCompile/GNUmakefile
@@ -1,7 +1,7 @@
 ## @file
 # GNU/Linux makefile for 'VfrCompile' module build.
 #
-# Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2008 - 2016, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.  The full text of the license may be found at
@@ -24,7 +24,7 @@ TOOL_INCLUDE = -I Pccts/h
 OBJECTS = AParser.o DLexerBase.o ATokenBuffer.o EfiVfrParser.o VfrLexer.o VfrSyntax.o \
           VfrFormPkg.o VfrError.o VfrUtilityLib.o VfrCompiler.o
 
-VFR_CPPFLAGS = -DPCCTS_USE_NAMESPACE_STD $(CPPFLAGS)
+VFR_CPPFLAGS = -DPCCTS_USE_NAMESPACE_STD $(BUILD_CPPFLAGS)
 
 LINKER = $(CXX)
 
-- 
2.8.0.windows.1