Add -Wswitch to --enable-gcc-warnings

Make --enable-gcc-warnings a bit pickier, by also using -Wswitch.
* configure.ac (WERROR_CFLAGS): Don’t add -Wno-switch.
* lib-src/etags.c (main, consider_token, C_entries):
* src/coding.c (encode_invocation_designation):
* src/data.c (Ftype_of):
* src/eval.c (Fdefvaralias, default_toplevel_binding)
(Fbacktrace__locals, mark_specpdl):
* src/lisp.h (record_xmalloc):
* src/syntax.c (scan_lists, scan_sexps_forward):
* src/window.c (window_relative_x_coord):
* src/xdisp.c (push_it, pop_it):
* src/xterm.c (xg_scroll_callback, x_check_fullscreen):
Error out or do nothing (as appropriate) if a switch statement
with an enum value does not cover all of the enum.
* src/dispextern.h (struct iterator_stack_entry.u.comp):
Remove unused member discovered by using -Wswitch.
* src/lisp.h (record_xmalloc): Add a ‘+ 0’ to pacify -Wswitch.
* src/vm-limit.c (check_memory_limits):
Simplify warning-diagnostic computation by using a table.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/coding.c b/src/coding.c
index 1544f319b00..d14e562ce9a 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -4295,6 +4295,9 @@ encode_invocation_designation (struct charset *charset,
           else
             ENCODE_LOCKING_SHIFT_3;
           break;
+
+        default:
+          break;
         }
     }
 
@@ -7292,6 +7295,8 @@ produce_annotation (struct coding_system *coding, ptrdiff_t pos)
               case CODING_ANNOTATE_CHARSET_MASK:
                 produce_charset (coding, charbuf, pos);
                 break;
+              default:
+                break;
               }
           charbuf += len;
         }