GCC
GCC supports C, C++, Objective-C, Fortran, Ada, Go, and more across many CPUs and operating systems.
Why use it
Open engines, Linux builds, and embedded targets gain mature optimization, diagnostics, and cross compilers.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
GPL obligations mainly cover the tool, but runtime exceptions, statically linked components, and platform ABIs still need review.