I found this patch which I've had in my tree since June; openacc.org
moved to https (plus we don't need the trailing slash).
Applied, and I'll probably push back to the GCC 7 branch at least.
Gerald
2017-09-03 Gerald Pfeifer <ger...@pfeifer.com>
* doc/generic.texi (OpenACC): Adjust URL.
* doc/invoke.texi (C Dialect Options): Ditto.
Index: doc/generic.texi
===================================================================
--- doc/generic.texi (revision 251624)
+++ doc/generic.texi (working copy)
@@ -2251,7 +2251,7 @@
@tindex OACC_UPDATE
All the statements starting with @code{OACC_} represent directives and
-clauses used by the OpenACC API @w{@uref{http://www.openacc.org/}}.
+clauses used by the OpenACC API @w{@uref{https://www.openacc.org}}.
@table @code
@item OACC_CACHE
Index: doc/invoke.texi
===================================================================
--- doc/invoke.texi (revision 251624)
+++ doc/invoke.texi (working copy)
@@ -2039,7 +2039,7 @@
Enable handling of OpenACC directives @code{#pragma acc} in C/C++ and
@code{!$acc} in Fortran. When @option{-fopenacc} is specified, the
compiler generates accelerated code according to the OpenACC Application
-Programming Interface v2.0 @w{@uref{http://www.openacc.org/}}. This option
+Programming Interface v2.0 @w{@uref{https://www.openacc.org}}. This option
implies @option{-pthread}, and thus is only supported on targets that
have support for @option{-pthread}.
