[PATCH] D84079: [flang] Prevent bogus runtime I/O error message

[Peter Klausler via Phabricator via llvm-commits]

klausler created this revision.
klausler added reviewers: sscalpone, schweitz.
klausler added a project: Flang.
Herald added a reviewer: jdoerfert.
Herald added a reviewer: DavidTruby.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

The runtime was requiring that STATUS='OLD' be explicitly specified
on an OPEN statement for a connected unit.  There error should issue
only if a STATUS= other than 'OLD' is specified; an OPEN with no
STATUS= specifier is okay.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84079

Files:
  flang/runtime/io-stmt.cpp
  flang/runtime/io-stmt.h


Index: flang/runtime/io-stmt.h
===================================================================
--- flang/runtime/io-stmt.h
+++ flang/runtime/io-stmt.h
@@ -302,7 +302,7 @@
 
 private:
   bool wasExtant_;
-  OpenStatus status_{OpenStatus::Unknown};
+  std::optional<OpenStatus> status_;
   Position position_{Position::AsIs};
   std::optional<Action> action_;
   OwningPtr<char> path_;
Index: flang/runtime/io-stmt.cpp
===================================================================
--- flang/runtime/io-stmt.cpp
+++ flang/runtime/io-stmt.cpp
@@ -162,11 +162,12 @@
 }
 
 int OpenStatementState::EndIoStatement() {
-  if (wasExtant_ && status_ != OpenStatus::Old) {
-    SignalError("OPEN statement for connected unit must have STATUS='OLD'");
+  if (wasExtant_ && status_ && *status_ != OpenStatus::Old) {
+    SignalError("OPEN statement for connected unit may not have STATUS= other "
+                "than 'OLD'");
   }
-  unit().OpenUnit(
-      status_, action_, position_, std::move(path_), pathLength_, *this);
+  unit().OpenUnit(status_.value_or(OpenStatus::Unknown), action_, position_,
+      std::move(path_), pathLength_, *this);
   return ExternalIoStatementBase::EndIoStatement();
 }
 


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