alt Hacker News> LLVM and clang specifically started eating its lunch
I don't know how you can eat GCC's lunch. I feel like in this analogy GCC eats from a communal trough and is very happy to share. A company that sells licenses can lose customers, the GNU project just wants the world to benefit. GCC is still ubiquitous and has plenty of developers and mindshare, what more could they want?
Basically most of the embedded folks that used GCC forks are now on clang, and if in the old days they were breaching GPL, nowadays they are fully compilant, so not upstreaming is not even a legal issue any longer.