re PR c/37428 (GNU VLA-in-structure extension is undocumented)

	PR c/37428
	* doc/extend.texi (C Extensions): Mention variable-length arrays in
	a structure/union.

From-SVN: r208836

gcc/ChangeLog

 2014-03-26  Marek Polacek  <polacek@redhat.com>
 
+	PR c/37428
+	* doc/extend.texi (C Extensions): Mention variable-length arrays in
+	a structure/union.
+
+2014-03-26  Marek Polacek  <polacek@redhat.com>
+
 	PR c/39525
 	* doc/extend.texi (Designated Inits): Describe what happens to omitted
 	field members.

gcc/doc/extend.texi

@@ -1592,6 +1592,18 @@ Jumping or breaking out of the scope of the array name deallocates the
 storage.  Jumping into the scope is not allowed; you get an error
 message for it.
 
+@cindex variable-length array in a structure
+As an extension, GCC accepts variable-length arrays as a member of
+a structure or a union.  For example:
+
+@smallexample
+void
+foo (int n)
+@{
+  struct S @{ int x[n]; @};
+@}
+@end smallexample
+
 @cindex @code{alloca} vs variable-length arrays
 You can use the function @code{alloca} to get an effect much like
 variable-length arrays.  The function @code{alloca} is available in