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How to include header file through make file

I know that there is a flag that can be used in the makefile to include the header file in all files that are compiled, just as there is a -D flag to include the definition. Which flag is intended to include header files. I don’t remember, I know.

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In your compilation command, you can use the option -include:

gcc -o main -include hello.h main.cpp
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something like this maybe? include_directories ($ {CMAKE_CURRENT_SOURCE_DIR} / enable)

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