when using compiler in the command line, you should take of the following: you need not compile a header file, since header file gets substituted in the script where include directive is used. you will require to compile and link the implementation and the script file. for example let cow.h be header file and cow.cpp be implementation file and cow.cc(c++ files can have extension .cpp, .cc, .cxx, .C, .CPP, .cp) be script file. Since gcc compiler notation for c++ file is g++, we can compile and link the files using

$g++ -g -Wall cow.cpp cow.cc -o cow.out

options '-g' and '-Wall' are for debugging info and getting warning for errors. Here cow.out is the name of the executable binary file that we can execute to run the program. it is always good to name your executable file otherwise name will be automatically given which might be confusing at times. you can also do the same by using makefiles, makefiles will detect, compile and link automatically the specified files. There are great resources for compilation using command line enter link description here

你仍然可以直接使用g++，如果你想:

g++ f1.cpp f2.cpp main.cpp

其中f1.cpp和f2.cpp是包含函数的文件。有关如何使用make进行构建的详细信息，请参阅优秀的GNU make文档。

您可以使用几个g++命令，然后链接，但最简单的是使用传统的Makefile或其他构建系统:如Scons(通常比Makefile更容易设置)。

在main.cpp之后列出所有其他CPP文件。

ie

g++ main.cpp other.cpp etc.cpp

等等。

或者您可以单独编译它们。然后链接所有结果”。O”文件一起。

现在我已经将类分离为.h和.cpp文件，我需要使用makefile还是我仍然可以使用“g++ main.cpp”命令?

如果您打算将几个文件放入Makefile中，那么一次编译几个文件是一个糟糕的选择。

通常在Makefile (GNU/Make)中，这样写就足够了:

# "all" is the name of the default target, running "make" without params would use it
all: executable1

# for C++, replace CC (c compiler) with CXX (c++ compiler) which is used as default linker
CC=$(CXX)

# tell which files should be used, .cpp -> .o make would do automatically
executable1: file1.o file2.o

通过这种方式，make只正确地重新编译需要重新编译的内容。还可以添加一些调整来生成头文件依赖项——这样make也可以正确地重建由于头文件更改而需要重建的内容。

要单独编译而不需要链接，你需要添加-c选项:

g++ -c myclass.cpp
g++ -c main.cpp
g++ myclass.o main.o
./a.out