[flang][runtime] Flush output before INQUIRE(..., SIZE=)

[klausler]

Ensure that any buffered data has tranferred to an external unit before measuring its file size.

[llvmbot]

@llvm/pr-subscribers-flang-runtime

Author: Peter Klausler (klausler)

Changes

Ensure that any buffered data has tranferred to an external unit before measuring its file size.

---

Full diff: https://github.com/llvm/llvm-project/pull/75379.diff

1 Files Affected:

• (modified) flang/runtime/io-stmt.cpp (+1)

diff --git a/flang/runtime/io-stmt.cpp b/flang/runtime/io-stmt.cpp
index dedf1f8364ad37..e4f1076016fd22 100644
--- a/flang/runtime/io-stmt.cpp
+++ b/flang/runtime/io-stmt.cpp
@@ -1219,6 +1219,7 @@ bool InquireUnitState::Inquire(
   case HashInquiryKeyword("SIZE"):
     result = -1;
     if (unit().IsConnected()) {
+      unit().FlushOutput(*this);
       if (auto size{unit().knownSize()}) {
         result = *size;
       }

[clementval]

LGTM