[Patch, fortran] PR34928 - Extension: volatile common blocks

[Dominique Dhumieres]

Updated patch. OK to commit?

Dominique

Index: gcc/fortran/ChangeLog
===================================================================
--- gcc/fortran/ChangeLog	(revision 208846)
+++ gcc/fortran/ChangeLog	(working copy)
@@ -1,3 +1,9 @@
+2014-03-26 Dominique d'Humieres <dominiq@lps.ens.fr>
+
+	PR fortran/34928
+	* fortran/gfortran.texi: Document Volatile COMMON as not
+	supported.
+
 2014-03-22  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/60603
Index: gcc/fortran/gfortran.texi
===================================================================
--- gcc/fortran/gfortran.texi	(revision 208846)
+++ gcc/fortran/gfortran.texi	(working copy)
@@ -2003,6 +2003,7 @@
 @c * CARRIAGECONTROL, DEFAULTFILE, DISPOSE and RECORDTYPE I/O specifiers::
 @c * Omitted arguments in procedure call::
 * Alternate complex function syntax::
+* Volatile COMMON blocks::
 @end menu
 
 
@@ -2197,7 +2198,19 @@
 common, but not the former.
 
 
+@node Volatile COMMON blocks
+@subsection Volatile @code{COMMON} blocks
+@cindex @code{VOLATILE}
+@cindex @code{COMMON}
 
+Some Fortran compilers, including @command{g77}, let the user declare
+@code{COMMON} with the @code{VOLATILE} attribute. This is
+invalid standard Fortran syntax and is not supported by
+@command{gfortran}.  Note that @command{gfortran} accepts VOLATILE
+variables in COMMON blocks since revision 4.3.
+
+
+
 @c ---------------------------------------------------------------------
 @c Mixed-Language Programming
 @c ---------------------------------------------------------------------