[PATCH] Use '--readnever' when invoking GDB from gcore.in

[Sergio Durigan Junior]

Back when I proposed the '--readnever' feature, I somehow forgot or
decided not to include the bits related to gcore.in in the original
patch.  This patch finally updates the gcore script to invoke GDB
using '--readnever'.

We've been carrying this patch on Fedora GDB for quite some time, and
as expected the corefiles generated by gcore on Fedora don't have
problems, which I think is the best indicator that the it's safe to
generate corefiles using '--readnever'.

OK to check in?

gdb/ChangeLog:
2019-02-21  Sergio Durigan Junior  <sergiodj@redhat.com>

	* gcore.in: Add '--readnever' option when invoking GDB.
---
 gdb/ChangeLog | 4 ++++
 gdb/gcore.in  | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b57cc87ed9..345fdf200a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2019-02-21  Sergio Durigan Junior  <sergiodj@redhat.com>
+
+	* gcore.in: Add '--readnever' option when invoking GDB.
+
 2019-02-21  Alan Hayward  <alan.hayward@arm.com>
 
 	* NEWS: Update style defaults.
diff --git a/gdb/gcore.in b/gdb/gcore.in
index 25602396d5..b9770ea415 100644
--- a/gdb/gcore.in
+++ b/gdb/gcore.in
@@ -97,7 +97,8 @@ for pid in "$@"
 do
 	# `</dev/null' to avoid touching interactive terminal if it is
 	# available but not accessible as GDB would get stopped on SIGTTIN.
-	"$binary_path/@GDB_TRANSFORM_NAME@" </dev/null --nx --batch \
+	"$binary_path/@GDB_TRANSFORM_NAME@" </dev/null \
+	    --nx --batch --readnever \
 	    -ex "set pagination off" -ex "set height 0" -ex "set width 0" \
 	    "${dump_all_cmds[@]}" \
 	    -ex "attach $pid" -ex "gcore $prefix.$pid" -ex detach -ex quit
-- 
2.17.2