[PATCH] D96875: [flang][driver] Add -fdebug-module-writer option

[Arnamoy B via Phabricator via cfe-commits]

arnamoy10 added inline comments.


================
Comment at: clang/include/clang/Driver/Options.td:4232-4233
   HelpText<"Use INTEGER(KIND=8) for the result type in size-related intrinsics.">;
+def fdebug_module_writer : Flag<["-"],"fdebug-module-writer">, Group<f_Group>, 
+  HelpText<"Enables showing debug messages while writing module files.">;
 }
----------------
awarzynski wrote:
> IMO this should be a frontend-only option. Compiler end-users are unlikely to need this in their regular workflows, right?  I recommend moving it [[ https://github.com/llvm/llvm-project/blob/adfd3c7083f9808d145239153c10f72eece485d8/clang/include/clang/Driver/Options.td#L4262-L4272 | here ]].
Yes, it makes sense to keep it as frontend-only option, let me submit an updated patch.


================
Comment at: flang/test/Semantics/mod-file-rewriter.f90:9
+! RUN: %flang-new -fsyntax-only -fdebug-module-writer %p/Inputs/mod-file-unchanged.f90 2>&1 | FileCheck %s --check-prefix CHECK_UNCHANGED
+! RUN: %flang-new -fsyntax-only -fdebug-module-writer %p/Inputs/mod-file-changed.f90 2>&1 | FileCheck %s --check-prefix CHECK_CHANGED
 
----------------
awarzynski wrote:
> arnamoy10 wrote:
> > tskeith wrote:
> > > Why do you need to duplicate these lines? Doesn't it work to use `%flang`?
> > `%flang` will unfortunately invoke `f18` currently.
> That depends on the value of `FLANG_BUILD_NEW_DRIVER`, which is translated into `include_flang_new_driver_test` [[ https://github.com/llvm/llvm-project/blob/adfd3c7083f9808d145239153c10f72eece485d8/flang/test/lit.cfg.py#L74-L85 | here ]]. I also think that this should work fine with `%flang`.
> 
> Also, I suggest that we only have tests with `flang_fc1` and keep this as a frontend-only option.
Sounds good.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96875/new/

https://reviews.llvm.org/D96875