[flang-commits] [flang] [flang] Accept C-style comments in label fields (PR #207012)

[Eugene Epshteyn via flang-commits]

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@@ -1366,12 +1408,27 @@ const char *Prescanner::FixedFormContinuationLine(bool atNewline) {
   }
   tabInCurrentLine_ = false;
   char col1{*nextLine_};
+  const char *afterWhiteSpace{SkipWhiteSpace(nextLine_)};
+  const char *afterCComment{
+      IsCComment(afterWhiteSpace) ? SkipCComment(afterWhiteSpace) : nullptr};
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eugeneepshteyn wrote:

I'm wondering if we should just document that starting a C comment on column 6 in fixed mode is a bad idea and is not supported. We don't want to break basic Fortran functionality over (admittedly useful) extension.

How do other compilers cope with C comment that starts at column 6?

https://github.com/llvm/llvm-project/pull/207012