GDC environment variable - solved, but new problem

[Dave Blanchard]

> Re GCC 9.1, however beware of <https://gcc.gnu.org/PR104749>
> "stage1 d21 fails to link with GDC 9.1".

Thanks for all who replied. Thanks especially for mentioning this problem, as my build did indeed fail with this error on GCC 9.3. I applied the fix and that's now resolved. Now I have the following problem:

gcc-12.2.0/libphobos/libdruntime/core/internal/atomic.d:771:24: error: undefined identifier '__atomic_fetch_add', did you mean function '__atomic_fetch_add_1'?

I tried to force --enable-libatomic which had no effect. --disable-libatomic caused a failure elsewhere. Well, I'm stumped. Any ideas? Thank you.

Dave