Search locations for gcc/g++

gxx_search_loc.md

https://stackoverflow.com/questions/344317/where-does-gcc-look-for-c-and-c-header-files

`gcc -print-prog-name=cc1plus` -v

This command asks gcc which C++ preprocessor it is using, and then asks that preprocessor where it looks for includes.

You will get a reliable answer for your specific setup.

Likewise, for the C preprocessor:

`gcc -print-prog-name=cpp` -v