[all-commits] [llvm/llvm-project] 739f49: [flang][driver] Fix how output filename is generated

[Andrzej Warzyński via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 739f49ed12a4d94cef07c7071e2ad6dbb93834f3
      https://github.com/llvm/llvm-project/commit/739f49ed12a4d94cef07c7071e2ad6dbb93834f3
  Author: Andrzej Warzynski <andrzej.warzynski at arm.com>
  Date:   2021-07-09 (Fri, 09 Jul 2021)

  Changed paths:
    M flang/tools/f18/flang.in

  Log Message:
  -----------
  [flang][driver] Fix how output filename is generated

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.

Differential Revision: https://reviews.llvm.org/D105546