Well known make Generally need Makefile To compile the relevant source code , But it can also be done without Makefile You can compile some simple source code .

In the algorithm competition , The source program of a problem usually has only one file , Use at this time Makefile Very cumbersome , But it takes time to input a long compilation instruction 

g++ a.cpp -o a

Sometimes , Use newer standards in order to use new features C++ standard , Or add debugging information or open Wall, At this time, you should enter 

g++ a.cpp -std=c++17 -g -Wall -o a

It seems very long and time-consuming . Fortunately, ,make There is a default compilation configuration , stay MacOS in , I just need to input 

make a

# make magically runs 'c++ a.cpp -o a'

It will call... By default c++ The compiler compiles the source code a.cpp, I don't need to enter that long string of compilation commands .

But because I want to change the default configuration , That is to say C++ 17 standard , Add others C++ flag（ such as -g -Wall -Dqwq), Or add static library and dynamic library links , Even change the compiler to g++. These can be modified by adding environment variables .

edit ~/.bash_profile（ perhaps ~/.bashrc, ~/.zshrc, It depends on the terminal you use ）, Add the following environment variables 

export CC="gcc"

export CXX="g++"

export LDFLAGS="-L/opt/homebrew/opt/llvm/bin"

export CPPFLAGS="-I/opt/homebrew/opt/llvm/include"

export CXXFLAGS="-std=c++17 -g -Wall"

export CFLAGS="-std=c17 -g -Wall"

Come down here ,

  • CC To configure C compiler
  • CXX To configure C++ compiler
  • LDFLAGS Configure dynamic link library address
  • CPPFLAGS To configure Flag, Yes C and C++ All in force
  • CXXFLAGS To configure Flag, Only on C++ take effect
  • CFLAGS To configure Flag, Only on C take effect

again source After downloading the configuration file or restarting the terminal , Input again make a compile a.cpp Will get 

make a

# make runs 'g++ -std=c++17 -g -Wall -I/opt/homebrew/opt/llvm/include -L/opt/homebrew/opt/llvm/bin  a`.cpp   -o a'

If it is a.c It is 

make a

# make runs 'gcc -std=c17 -g -Wall -I/opt/homebrew/opt/llvm/include -L/opt/homebrew/opt/llvm/bin  a.c   -o a'

This is exactly what we need , So when compiling a single file with the command line , We just need to enter make <sourceCode> That's all right. ！

The above method applies to Linux and MacOS,Windows Should be in System environment variable Add the above environment variable name and corresponding value , Restart the terminal .

Of course , Configured compiler gcc and g++ Also make sure that in the environment variable , Or input gcc or g++ The absolute path of can also .

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