G ++添加包含和链接路径

Question

My Problem

I read somewhere that to add include paths to g++ you need to use the -I option:

g++ -I /some/directory and_then_my_files.cpp

However, I'm not sure if this is actually what I need. It's currently not working for me, and I couldn't find anything else close to what I have.

My Setup

I've got a directory with all my current project code, and in it a subdirectory classes , that contains various .h and .cpp files containing classes that may or may not be used when compiling my main files.

Since g++ ./classes/*.cpp main.cpp takes a long time (large number of files in classes directory), I'm looking for an alternative that only compiles and links the files that are included in the main file.

Main file:

#include "classes/a.h"
#include "classes/b.h"
// ... my code

And as you can imagine, g++ complains about undefined references to classes A and B, unless I add ./classes/*.cpp to the build command.

What I want to achieve

So -I and -L did not work, and adding the whole directory to the build command results in a ridiculously long build time - I'm talking 3-5 minutes, which really slows down my development speed.

Is there any way to only build/link the included classes from my classes directory, such as only classes A and B from the example I gave above?

Small Recap of what I've already tried

g++ -I ./classes main.cpp -o main

g++ -L ./classes main.cpp -o main (probably stupid but I tried it anyway)

g++ ./classes/*.cpp main.cpp -o main (what I currently have to resort to)

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Thanks in advance :)

Answer 1

临时解决方法

export CPLUS_INCLUDE_PATH=/usr/local/include