[flang-commits] [PATCH] D145743: [flang] Forward references to COMMON from specification expr under IMPLICIT NONE

[Peter Klausler via Phabricator via flang-commits]

klausler created this revision.
klausler added reviewers: PeteSteinfeld, DavidTruby.
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As a near-universal extension, Fortran compilers permit forward references
to dummy arguments and variables in COMMON blocks from specification expressions
before an explicit type-declaration-stmt appears for those variables
under IMPLICIT NONE, so long as those variables are later explicitly typed
with the types that regular implicit typing rules would have given them
(usually default INTEGER).

F18 <https://reviews.llvm.org/F18> implemented this extension for dummy arguments, but not variables in
COMMON blocks.  Extend the extension to also accept variables in COMMON.


https://reviews.llvm.org/D145743

Files:
  flang/docs/Extensions.md
  flang/include/flang/Common/Fortran-features.h
  flang/lib/Semantics/resolve-names.cpp
  flang/test/Semantics/implicit11.f90
  flang/test/Semantics/resolve103.f90

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