tblah added a comment.

Please could you add tests for the flag forwarding logic in 
flang/tests/Driver/frontend-forwarding.f90. For example see 
https://reviews.llvm.org/rGd0d4b635786d510cd919cadbeb7e5e19983242cf



================
Comment at: clang/lib/Driver/ToolChains/Flang.cpp:69
+  Arg *loopVersioning =
+      Args.getLastArg(options::OPT_Ofast, options::OPT_floop_versioning,
+                      options::OPT_fno_loop_versioning);
----------------
Does GFortran only enable this with -Ofast? I would have thought this would be 
an -On thing because it doesn't impact precision.


================
Comment at: flang/include/flang/Frontend/CodeGenOptions.def:27
 
+CODEGENOPT(LoopVersioning, 1, 0) ///< PIC level of the LLVM module.
 CODEGENOPT(PICLevel, 2, 0) ///< PIC level of the LLVM module.
----------------
nit: comment


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D141307/new/

https://reviews.llvm.org/D141307

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