Suppress GCC 9 “no longer supported” messages

* m4/manywarnings.m4 (gl_MANYWARN_ALL_GCC): Remove -Wchkp.
This suppresses a boatload of warnings of the form
“gcc: warning: switch ‘-Wchkp’ is no longer supported”.
when using GCC 9.  Do not merge to master.

1 files changed, 1 insertions, 2 deletions

diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
index 72fdd418607..c876caa16ae 100644
--- a/m4/manywarnings.m4
+++ b/m4/manywarnings.m4
@@ -1,4 +1,4 @@
-# manywarnings.m4 serial 13
+# manywarnings.m4 serial 13-emacs
 dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -126,7 +126,6 @@ m4_defun([gl_MANYWARN_ALL_GCC(C)],
     -Wbuiltin-macro-redefined \
     -Wcast-align \
     -Wchar-subscripts \
-    -Wchkp \
     -Wclobbered \
     -Wcomment \
     -Wcomments \