[英]C++ - Compiling multiple files
I was learning about the makefile tool which seems very powerful, and was trying to figure out how to make it work since I have 4 different mains and a common class for 3 of them. 我正在学习makefile工具,它似乎非常强大,并试图找出如何使它工作,因为我有4个不同的主电源和3个共同的类。
What I'd like to get is: 我想得到的是:
Linear: g++ -o linear linear.cpp
线性:
g++ -o linear linear.cpp
Linear5: g++ -o linear5 linear5.cpp Contenidor.cpp Contenidor.h
Linear5:
g++ -o linear5 linear5.cpp Contenidor.cpp Contenidor.h
Logarithmic: g++ -o logarithmic logarithmic.cpp Contenidor.cpp Contenidor.h
对数:
g++ -o logarithmic logarithmic.cpp Contenidor.cpp Contenidor.h
Constant: g++ -o constant constant.cpp Contenidor.cpp Contenidor.h
常量:
g++ -o constant constant.cpp Contenidor.cpp Contenidor.h
With the following Makefile code: 使用以下Makefile代码:
all: linear5 linear logarithmic constant
linear5: linear5.o
g++ -o linear5 linear5.o
linear5.o: linear5.cpp
g++ -cpp linear5.cpp
Contenidor.o: Contenidor.cpp
g++ -cpp Contenidor.cpp
linear: linear.o Contenidor.o
g++ -o linear linear.o Contenidor.o
linear.o: linear.cpp
g++ -cpp linear.cpp
logarithmic: logarithmic.o Contenidor.o
g++ -o logarithmic logarithmic.o Contenidor.o
logarithmic.o: logarithmic.cpp
g++ -cpp logarithmic.cpp
constant: constant.o Contenidor.o
g++ -std=gnu++0x -o constant constant.o Contenidor.o
constant.o: constant.cpp
g++ -cpp constant.cpp
clean:
rm *.o
But an error pops out when I try execute the make command: 但是当我尝试执行make命令时会弹出一个错误:
g++ -cpp linear5.cpp
g++ -o linear5 linear5.o
g++: linear5.o: No such file or directory
g++: no input files
The problem is in the way you perform two-step compilation: you should change every instance of 问题在于您执行两步编译的方式:您应该更改每个实例
file.o: file.cpp
g++ -cpp file.cpp
into: 成:
file.o: file.cpp
g++ -c -o file.o file.cpp
This way, you tell g++ to just compile ( -c
) and not link your file; 这样,你告诉g ++只是编译(
-c
)而不是链接你的文件; the output will be an object file, you still have to specify its name with -o
though. 输出将是一个目标文件,您仍然必须使用
-o
指定其名称。
Then, the object file can be used in later steps. 然后,目标文件可以在以后的步骤中使用。
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