Subzero: Build both Debug and Release version of llvm2ice.

Makefile.standalone

Index: Makefile.standalone
diff --git a/Makefile.standalone b/Makefile.standalone
index b6d0d179d196693e31da4af13c617421c05180bb..2caf82dddcf1f61d8c805c98b78bb0c635e19a5f 100644
--- a/Makefile.standalone
+++ b/Makefile.standalone
@@ -50,12 +50,11 @@ LLVM_LDFLAGS := `$(LLVM_BIN_PATH)/llvm-config --libs` \
                 `$(LLVM_BIN_PATH)/llvm-config --ldflags`
 
 # It's recommended that CXX matches the compiler you used to build LLVM itself.
-OPTLEVEL := -O0
 CCACHE := `command -v ccache`
 CXX := CCACHE_CPP2=yes $(CCACHE) $(CLANG_PATH)/clang++
 
 CXXFLAGS := $(LLVM_CXXFLAGS) -std=c++11 -Wall -Wextra -Werror -fno-rtti \
-	-fno-exceptions $(OPTLEVEL) -g $(HOST_FLAGS) \
+	-fno-exceptions  -g $(HOST_FLAGS) \
 	-Wno-error=unused-parameter -I$(LIBCXX_INSTALL_PATH)/include/c++/v1
 LDFLAGS := $(HOST_FLAGS) -L$(LIBCXX_INSTALL_PATH)/lib
 
@@ -82,24 +81,32 @@ SRCS= \
 	llvm2ice.cpp \
 	PNaClTranslator.cpp
 
-OBJS=$(patsubst %.cpp, build/%.o, $(SRCS))
+OBJS_DBG=$(patsubst %.cpp, build/Debug/%.o, $(SRCS))
+OBJS_REL=$(patsubst %.cpp, build/Release/%.o, $(SRCS))
 
 # Keep all the first target so it's the default.
+# Note: llvm2ice_dbg is not built by default; "make llvm2ice_dbg" if needed.
 all: llvm2ice
 
 .PHONY: all
 
-llvm2ice: $(OBJS)
+llvm2ice: $(OBJS_REL)
+	$(CXX) $(LDFLAGS) -o $@ $^ $(LLVM_LDFLAGS) -ldl \
+               -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
+llvm2ice_dbg: $(OBJS_DBG)
 	$(CXX) $(LDFLAGS) -o $@ $^ $(LLVM_LDFLAGS) -ldl \
                -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
 
 # TODO: Be more precise than "*.h" here and elsewhere.
-$(OBJS): build/%.o: src/%.cpp src/*.h src/*.def
-	$(CXX) -c $(CXXFLAGS) $< -o $@
+$(OBJS_DBG): build/Debug/%.o: src/%.cpp src/*.h src/*.def
+	$(CXX) -c -O0 $(CXXFLAGS) $< -o $@
+$(OBJS_REL): build/Release/%.o: src/%.cpp src/*.h src/*.def
+	$(CXX) -c -O2 $(CXXFLAGS) $< -o $@
 
-$(OBJS): | build
+$(OBJS_DBG): | build/Debug
+$(OBJS_REL): | build/Release
 
-build:
+build/Debug build/Release:
 	@mkdir -p $@
 
 check-lit: llvm2ice
@@ -129,4 +136,4 @@ format-diff:
 	$(CLANG_FORMAT_DIFF) -p1 -style=LLVM -i
 
 clean:
-	rm -rf llvm2ice *.o build/
+	rm -rf llvm2ice llvm2ice_dbg *.o build/