HaD reads the #included headers from a bunch of C files and prints the corresponding compiler options.
For instance, if #include <math.h> is used, option -lm is required, or if #include <pthread.h> is used, -pthread is required.
To do so, HaD relies on a database maintained by hand, as well as on pkg-config.
It currently supports only GCC and Clang on Linux.
You can help a lot by enriching files hadlib/*.cfg.
This is actually the heart of the tool.
All the rest is simple code to read and present this knowledge.
HaD is published as free software under the terms of the MIT licence