[flang][docs] Document non-supported VMS extensions

The prescanner does not support VMS Fortran listing control directives
(%LIST, %NOLIST, %EJECT) or continuation lines on INCLUDE lines.

Differential Revision: https://reviews.llvm.org/D127791

diff --git a/flang/docs/Extensions.md b/flang/docs/Extensions.md
index 6becaf3..e0c0bf6 100644 (file)
--- a/flang/docs/Extensions.md
+++ b/flang/docs/Extensions.md
@@ -306,6 +306,8 @@ end
   related generics. Some accepted exceptions are listed above in the allowed extensions.
   PGI, Intel, and XLF support this in ways that are not numerically equivalent.
   PGI converts the arguments while Intel and XLF replace the specific by the related generic.
+* VMS listing control directives (`%LIST`, `%NOLIST`, `%EJECT`)
+* Continuation lines on `INCLUDE` lines
 
 ## Preprocessing behavior