[umvi]

Are you building like FPGA bitstreams or something? 4 hours seems insanely long for software unless it is literally millions upon millions of lines of code

[jandrese]

Maybe he #included boost.

[gnulinux]

Maybe it's an aggressively optimizing and correctness-checking C++ compiler. GCC, clang can take a long time depending on complexity of code and flags provided.

[b1gtuna]

I've built bitstreams, but these days I build software for consumer electronics with screens running ARM Linux.