I know that some are moving their contribution efforts to the LLVM/Clang stack instead of GCC. (As it is, from a source code perspective, LLVM code is infinitely cleaner and more maintainable than GNU's code.)
Remember, of course, the letter isn't calling for people to stop using FSF/GNU projects, just to stop contributing. If the FSF remains unyielding, we may just need to fork the GNU projects and/or change our defaults. With GNOME already backing the letter, that may be a real possibility.
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I've heard rumblings of forks.
In any case, there are alternatives!
I know that some are moving their contribution efforts to the LLVM/Clang stack instead of GCC. (As it is, from a source code perspective, LLVM code is infinitely cleaner and more maintainable than GNU's code.)
Instead of glibc, there's musl.
Instead of Autotools, we have CMake, Ninja, and SCons
And, again, all of GNU's code can be forked.
Remember, of course, the letter isn't calling for people to stop using FSF/GNU projects, just to stop contributing. If the FSF remains unyielding, we may just need to fork the GNU projects and/or change our defaults. With GNOME already backing the letter, that may be a real possibility.