Check list object type if --enable-gcc-warnings

* configure.ac (--enable-check-lisp-object-type):
Default to "yes" if --enable-gcc-warnings is not "no".
* etc/NEWS: Mention this.
* src/eval.c (internal_lisp_condition_case): Fix some glitches
with 'volatile' uncovered by the above: in particular, 'clauses'
should be a pointer to volatile storage on the stack, and need not
be volatile itself.  Use an int, not ptrdiff_t, to count clauses.
Don’t bother gathering binding count if VAR is nil.  Use
more-specific local names to try to clarify what’s going on.

1 files changed, 4 insertions, 1 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 173c4e466bc..410e681c9e7 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -42,6 +42,9 @@ now the default in developer builds.  As before, use
 '--disable-gcc-warnings' to suppress GCC's warnings, and
 '--enable-gcc-warnings' to stop the build if GCC issues warnings.
 
+** When GCC warnings are enabled, '--enable-check-lisp-object-type' is
+now enabled by default when configuring.
+
 +++
 ** The Emacs server now has socket-launching support.  This allows
 socket based activation, where an external process like systemd can
@@ -393,7 +396,7 @@ procedure and therefore obeys saving hooks.
 * Changes in Specialized Modes and Packages in Emacs 26.1
 
 *** Info menu and index completion uses substring completion by default.
-This can be customized via the `info-menu` category in
+This can be customized via the info-menu category in
 completion-category-override.
 
 +++