[PATCH] Using LLVM compiler set to build BaseTools in Linux

["Zhiguang Liu" <zhiguang.liu@intel.com>]

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2842

To use LLVM to build BaseTools, first set the CLANG_BIN environment value,
and add "CXX=llvm" to choose LLVM compiler set when using make command.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>

Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
---
 BaseTools/Source/C/Makefiles/header.makefile       | 22 ++++++++++++++++++++--
 BaseTools/Source/C/VfrCompile/GNUmakefile          |  6 ++++--
 BaseTools/Source/C/VfrCompile/Pccts/antlr/makefile |  4 ++++
 BaseTools/Source/C/VfrCompile/Pccts/dlg/makefile   |  4 ++++
 4 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/BaseTools/Source/C/Makefiles/header.makefile b/BaseTools/Source/C/Makefiles/header.makefile
index 4e9b36d98b..1c105ee7d4 100644
--- a/BaseTools/Source/C/Makefiles/header.makefile
+++ b/BaseTools/Source/C/Makefiles/header.makefile
@@ -38,12 +38,19 @@ endif
 CYGWIN:=$(findstring CYGWIN, $(shell uname -s))
 LINUX:=$(findstring Linux, $(shell uname -s))
 DARWIN:=$(findstring Darwin, $(shell uname -s))
-
+ifeq ($(CXX), llvm)
+BUILD_CC ?= $(CLANG_BIN)clang
+BUILD_CXX ?= $(CLANG_BIN)clang++
+BUILD_AS ?= $(CLANG_BIN)clang
+BUILD_AR ?= $(CLANG_BIN)llvm-ar
+BUILD_LD ?= $(CLANG_BIN)llvm-ld
+else
 BUILD_CC ?= gcc
 BUILD_CXX ?= g++
 BUILD_AS ?= gcc
 BUILD_AR ?= ar
 BUILD_LD ?= ld
+endif
 LINKER ?= $(BUILD_CC)
 ifeq ($(HOST_ARCH), IA32)
 ARCH_INCLUDE = -I $(MAKEROOT)/Include/Ia32/
@@ -72,14 +79,25 @@ ifeq ($(DARWIN),Darwin)
 BUILD_CFLAGS = -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror \
 -Wno-deprecated-declarations -Wno-self-assign -Wno-unused-result -nostdlib -g
 else
+ifeq ($(CXX), llvm)
+BUILD_CFLAGS = -MD -fshort-wchar -fno-strict-aliasing -fwrapv \
+-fno-delete-null-pointer-checks -Wall -Werror \
+-Wno-deprecated-declarations -Wno-self-assign \
+-Wno-unused-result -nostdlib -g
+else
 BUILD_CFLAGS = -MD -fshort-wchar -fno-strict-aliasing -fwrapv \
 -fno-delete-null-pointer-checks -Wall -Werror \
 -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-restrict \
 -Wno-unused-result -nostdlib -g
 endif
+endif
+ifeq ($(CXX), llvm)
+BUILD_LFLAGS =
+BUILD_CXXFLAGS = -Wno-deprecated-register -Wno-unused-result
+else
 BUILD_LFLAGS =
 BUILD_CXXFLAGS = -Wno-unused-result
-
+endif
 ifeq ($(HOST_ARCH), IA32)
 #
 # Snow Leopard  is a 32-bit and 64-bit environment. uname -m returns i386, but gcc defaults
diff --git a/BaseTools/Source/C/VfrCompile/GNUmakefile b/BaseTools/Source/C/VfrCompile/GNUmakefile
index 42e3d7da02..fc329944b9 100644
--- a/BaseTools/Source/C/VfrCompile/GNUmakefile
+++ b/BaseTools/Source/C/VfrCompile/GNUmakefile
@@ -16,9 +16,11 @@ TOOL_INCLUDE = -I Pccts/h
 #OBJECTS = VfrSyntax.o VfrServices.o DLGLexer.o EfiVfrParser.o ATokenBuffer.o DLexerBase.o AParser.o
 OBJECTS = AParser.o DLexerBase.o ATokenBuffer.o EfiVfrParser.o VfrLexer.o VfrSyntax.o \
           VfrFormPkg.o VfrError.o VfrUtilityLib.o VfrCompiler.o
-
+ifeq ($(CXX), llvm)
+VFR_CPPFLAGS = -Wno-deprecated-register -DPCCTS_USE_NAMESPACE_STD $(BUILD_CPPFLAGS)
+else
 VFR_CPPFLAGS = -DPCCTS_USE_NAMESPACE_STD $(BUILD_CPPFLAGS)
-
+endif
 # keep BUILD_OPTFLAGS last
 VFR_CXXFLAGS = $(BUILD_OPTFLAGS)
 
diff --git a/BaseTools/Source/C/VfrCompile/Pccts/antlr/makefile b/BaseTools/Source/C/VfrCompile/Pccts/antlr/makefile
index 8f2cc78c59..559b1c99f1 100644
--- a/BaseTools/Source/C/VfrCompile/Pccts/antlr/makefile
+++ b/BaseTools/Source/C/VfrCompile/Pccts/antlr/makefile
@@ -164,7 +164,11 @@ PCCTS_H=../h
 #
 #   UNIX  (default)
 #
+ifeq ($(CXX), llvm)
+BUILD_CC?=$(CLANG_BIN)clang
+else
 BUILD_CC?=gcc
+endif
 COPT=-O
 ANTLR=${BIN_DIR}/antlr
 DLG=${BIN_DIR}/dlg
diff --git a/BaseTools/Source/C/VfrCompile/Pccts/dlg/makefile b/BaseTools/Source/C/VfrCompile/Pccts/dlg/makefile
index b3a34d3b46..5a3561edec 100644
--- a/BaseTools/Source/C/VfrCompile/Pccts/dlg/makefile
+++ b/BaseTools/Source/C/VfrCompile/Pccts/dlg/makefile
@@ -114,7 +114,11 @@ PCCTS_H=../h
 #
 #   UNIX
 #
+ifeq ($(CXX), llvm)
+BUILD_CC?=$(CLANG_BIN)clang
+else
 BUILD_CC?=cc
+endif
 COPT=-O
 ANTLR=${BIN_DIR}/antlr
 DLG=${BIN_DIR}/dlg
-- 
2.25.1.windows.1