[flang-dev] Driver development update: initial clang changes ready

[Peter Waller via flang-dev]

Hi All,

A quick driver update.

As per the RFC in http://lists.llvm.org/pipermail/cfe-dev/2019-June/062669.html, I have submitted a review request at https://reviews.llvm.org/D63607 which adds initial "--driver-mode=fortran" support to libclangDriver. It is intentionally fairly basic, and is intended to mirror clang's behaviour.

Please take a look, all input is welcomed. Assumptions are starting to form about how flang's frontend will look in the future. I hope that things will start landing soon so that the details can be hashed out in public.

As a reminder, the current intent is to introduce a new main() entrypoint called flang which calls libclangDriver in fortran mode, and implements a basic `flang -fc1`, which is structured similarly to clang, too.

There should be more to share on the f18 side in the near future.

All the best,

- Peter

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