如何指示Makefile使用不同的编译器

Question

我必须使用两个不同的编译器和库一次为两个不同的平台构建我的代码.如何使用单个make文件执行此操作.

目前我的makefile内容如下.如何指示它在同一个makefile中将编译器更改为gcc？

VPATH = /root/Documents/project/src 

CROSS_COMPILE  = /opt/compilers/bin/compiler1
CXX = $(CROSS_COMPILE)-g++
CC = $(CROSS_COMPILE)-gcc
AS = $(CROSS_COMPILE)-as
AR = $(CROSS_COMPILE)-ar
NM = $(CROSS_COMPILE)-nm
LD = $(CROSS_COMPILE)-ld
OBJDUMP = $(CROSS_COMPILE)-objdump
OBJCOPY = $(CROSS_COMPILE)-objcopy
RANLIB = $(CROSS_COMPILE)-ranlib
STRIP = $(CROSS_COMPILE)-strip


CFLAGS       = -c -Wall -D_REENTRANT -DACE_HAS_AIO_CALLS -D_GNU_SOURCE -DACE_HAS_EXCEPTIONS -D__ACE_INLINE__  
LDFLAGS      = -L. -L/etc/ACE_wrappers/lib 
CPPFLAGS     += -I/etc/ACE_wrappers -I/etc/ACE_wrappers/ace 
LDLIBS       = -lACE

OUTPUT_DIRECTORY=/root/Documents/bin
OBJ=/root/Documents/obj

ifneq ($(OUTPUT_DIRECTORY),)
all: $(OUTPUT_DIRECTORY)
$(OUTPUT_DIRECTORY):
    -@$(MKDIR) "$(OUTPUT_DIRECTORY)"
endif

ifneq ($(OBJ),)
all: $(OBJ)
$(OBJ_DIR):
    -@$(MKDIR) "$(OBJ)"
endif

SOURCES=File_1.cpp File_2.cpp 

OBJECTS=$(SOURCES:%.cpp=$(OBJ)/%.o)

$(OBJ)/%.o: %.cpp
    @echo Building Objects
    $(CC) $(CFLAGS) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<


EXECUTABLE=MyExecutable

all: $(SOURCES) $(EXECUTABLE)

$(EXECUTABLE): $(OBJECTS) 
    @echo $(SOURCES)
    $(CC) $(LDFLAGS) $(OBJECTS) $(LDLIBS) -o $(OUTPUT_DIRECTORY)/$@

File_1.o:File_1.cpp
File_1.o:File_1.cpp


.PHONY: clean
clean:
    rm $(OBJECTS) $(OUTPUT_DIRECTORY)/$(EXECUTABLE) 

Answer 1

我首先将所有特定于平台的定义放在一个单独的makefile中.这样你就可以做到:

include $(TARGET).make

其中$(TARGET).make为每个特定平台定义CC和其他变量.然后你可以调用make递归设置TARGET到你想要的.就像是:

build:
    $(MAKE) TARGET=platform1 all
    $(MAKE) TARGET=platform2 all

但实际上有许多方法可以实现同样的目标.