I am trying to compile my .cpp with -fno-leading-underscore option but it raises an error saying:
clang: error: unknown argument: '-fno-leading-underscore'
g++ -m32 -fno-use-cxa-atexit -nostdlib -fno-builtin -fno-rtti -fno-exceptions -fno-leading-underscore -o kernel.o -c kernel.cpp
How can I fix this I am new to Mac it used to work on Linux Mint
In your terminal, type g++ and press enter. You will probably get:
$ clang: No input files
As you can see its still clang underneath.
To fix this, first cd into /usr/local/bin and type ls. You will see the binaries inside:
g++-9
...
Next, create a symlink to it so that you can invoke g++ directly
ln -s g++-9 g++
If it still doesn't work for some reason, you can explicitly write g++-9 or whatever version you have. You can even give the full path /usr/local/bin/g++-9