[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 6becaf3c96e946494ac1b9da139bd3afbb090c7c..e0c0bf6bfed796d78f026a68d3b759ef38f2f099 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