[clang] [flang] [llvm] [openmp] [flang][driver] rename flang-new to flang (PR #110023)

[Sylvestre Ledru via llvm-commits]

sylvestre wrote:

OK, bizarre.
With apt.llvm.org, flang is the only one with the prefix (-20) in /usr/lib/llvm-20/bin/

https://github.com/llvm/llvm-project/pull/110023