[flang-commits] [PATCH] D146576: [flang] Reimplement C1406 check as a warning

[Peter Klausler via Phabricator via flang-commits]

klausler created this revision.
klausler added a reviewer: vdonaldson.
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Constraint C1406 in Fortran 2018 prohibits the USE of the same module  
name as both an intrinsic module and a non-intrinsic module in a scope.
The current check misinterprets the constraint as applying only to
explicitly INTRINSIC or NON_INTRINSIC module natures.

Change the check to also apply to non-explicit module natures, and
also downgrade it to a portability warning, since there is no ambiguity
and I suspect that we need to accept this usage when building f18's
own intrinsic modules.


https://reviews.llvm.org/D146576

Files:
  flang/docs/Extensions.md
  flang/lib/Semantics/resolve-names.cpp
  flang/test/Semantics/modfile43.f90

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