...which is why sane, large projects use precompiled headers (PCH). C (and later C++) compilers have used precompiled headers since at least the late 80s. PCH

...which is why sane, large projects use precompiled headers (PCH). C (and later C++) compilers have used precompiled headers since at least the late 80s. PCH speeds up compilation and roots out (hopefully, the few) cases where precompiled headers fail. But C/C++ wasn't designed for a world where tens/hundreds of programmers build an app measured in the tens/hundreds of megabytes.