[PATCH] D105546: [flang][driver] Fix how output filename is generated

[Andrzej Warzynski via Phabricator via llvm-commits]

awarzynski created this revision.
Herald added a reviewer: sscalpone.
awarzynski requested review of this revision.
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Currently, `flang -c file.f` generates `flang_unparsed_source_file_0.o`.
This is incorrect. This patch:

- simplifies the logic around output filename generation, and
- makes sure that `file.o` is produced instead of e.g. `flang_unparsed_source_file_0.o` when using the `-c` flag

The output filename generation is moved to a dedicated function. I've
also made a few minor improvements, e.g. marked variables as local,
added comments, refined error messages.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105546

Files:
  flang/tools/f18/flang.in

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