[clang] [flang] [flang][driver] Allow explicit specification of -lFortran_main (PR #78152)

[Michael Klemm via cfe-commits]

mjklemm wrote:

Should this PR be closed at some point?  It seems to be obsolete with the work that has been done in the recent past to improve the situation.

https://github.com/llvm/llvm-project/pull/78152