[all-commits] [llvm/llvm-project] e468f0: [flang] Set "undefined" NEXTREC=n variable to 0 ra...

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e468f07550c56eeb49659d02c7c5c3f79f53db6f
      https://github.com/llvm/llvm-project/commit/e468f07550c56eeb49659d02c7c5c3f79f53db6f
  Author: Peter Klausler <pklausler at nvidia.com>
  Date:   2023-06-06 (Tue, 06 Jun 2023)

  Changed paths:
    M flang/runtime/io-api.cpp

  Log Message:
  -----------
  [flang] Set "undefined" NEXTREC=n variable to 0 rather than random garbage

12.10.2.17 defines that a INQUIRE statement's NEXTREC=n output value
for a unit that is not connected for direct access becomes undefined,
but the current I/O runtime can fail in a confusing manner by trying
to return uninitialized stack garbage.

Reported on Slack by Tarun Prabhu as an intermittent failure in
the gfortran regression test inquire_pre.f90.

Differential Revision: https://reviews.llvm.org/D152295