Remove the build-time option CLASH_DETECTION

Every platform supports it, and the runtime option `create-lockfiles'
replaces it.

* configure.ac (CLASH_DETECTION): Remove option.

* lisp/files.el (lock-buffer, unlock-buffer, file-locked-p):
Remove fallback aliases, since they are always defined now.

* src/buffer.c (Frestore_buffer_modified_p, Fkill_buffer):
* src/emacs.c (shut_down_emacs):
* src/fileio.c (Finsert_file_contents, write_region):
* src/filelock.c (top-level, syms_of_filelock):
* src/insdel.c (prepare_to_modify_buffer_1):
CLASH_DETECTION is always defined now.

* admin/CPP-DEFINES: Remove CLASH_DETECTION.

1 files changed, 0 insertions, 6 deletions

diff --git a/src/filelock.c b/src/filelock.c
index 5252db09104..cc5c821cadd 100644
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -55,8 +55,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "w32.h"        /* for dostounix_filename */
 #endif
 
-#ifdef CLASH_DETECTION
-
 #ifdef HAVE_UTMP_H
 #include <utmp.h>
 #endif
@@ -837,8 +835,6 @@ t if it is locked by you, else a string saying which user has locked it.  */)
   return ret;
 }
 
-#endif /* CLASH_DETECTION */
-
 void
 syms_of_filelock (void)
 {
@@ -850,9 +846,7 @@ syms_of_filelock (void)
                doc: /* Non-nil means use lockfiles to avoid editing collisions.  */);
   create_lockfiles = 1;
 
-#ifdef CLASH_DETECTION
   defsubr (&Sunlock_buffer);
   defsubr (&Slock_buffer);
   defsubr (&Sfile_locked_p);
-#endif
 }