Unexec removal: Main part

* configure.ac: Remove unexec-specific parts.
(EMACS_CONFIG_FEATURES): Always report that we do not have the UNEXEC
feature.
(AC_ECHO): No longer display a line about the unexec feature.
* lisp/loadup.el:
* lisp/startup.el: Remove unexec-specific code.
* src/Makefile.in (base_obj): Drop 'UNEXEC_OBJ'.
* src/alloc.c (staticvec): Never initialize this variable.
(BLOCK_ALIGN): Always allow large blocks.
(mmap_lisp_allowed_p): Remove unexec-specific code.
* src/buffer.c (init_buffer):
* src/conf_post.h (ADDRESS_SANITIZER):
* src/emacs.c (load_pdump, main): Remove unexec-specific code.
(Fdump_emacs): Remove function.
(syms_of_emacs): Remove 'Fdump_emacs'.
* src/lastfile.c: Remove unexec-specific code.
* src/lisp.h (gflags): Remove unexec-specific flags.
(will_dump_p, will_bootstrap_p, will_dump_with_unexec_p)
(dumped_with_unexec_p, definitely_will_not_unexec_p): Remove or adjust
predicates.
(SUBR_SECTION_ATTRIBUTE): Remove unexec-specific definition.
* src/pdumper.c (Fdump_emacs_portable): Remove unexec-specific warning.
* src/process.c (init_process_emacs): Remove !unexec condition
* src/sysdep.c (maybe_disable_address_randomization): Adjust comment.
(init_signals):
* src/timefns.c (init_timefns): Remove unexec-specific code.
* src/w32heap.c (report_temacs_memory_usage): Remove function.
* src/w32heap.h: Adjust comment.
* src/w32image.c (globals_of_w32image): Remove unexec-specific code.

1 files changed, 28 insertions, 39 deletions

diff --git a/src/process.c b/src/process.c
index b71ba3daf2d..dcf08fd9b57 100644
--- a/src/process.c
+++ b/src/process.c
@@ -8620,50 +8620,39 @@ init_process_emacs (int sockfd)
 
   inhibit_sentinels = 0;
 
-#ifdef HAVE_UNEXEC
-  /* Clear child_signal_read_fd and child_signal_write_fd after dumping,
-     lest wait_reading_process_output should select on nonexistent file
-     descriptors which existed in the build process.  */
-  child_signal_read_fd = -1;
-  child_signal_write_fd = -1;
-#endif /* HAVE_UNEXEC */
+#if defined HAVE_GLIB && !defined WINDOWSNT
+  /* Tickle Glib's child-handling code.  Ask Glib to install a
+     watch source for Emacs itself which will initialize glib's
+     private SIGCHLD handler, allowing catch_child_signal to copy
+     it into lib_child_handler.  This is a hacky workaround to get
+     glib's g_unix_signal_handler into lib_child_handler.
+
+     In Glib 2.37.5 (2013), commit 2e471acf changed Glib to
+     always install a signal handler when g_child_watch_source_new
+     is called and not just the first time it's called, and to
+     reset signal handlers to SIG_DFL when it no longer has a
+     watcher on that signal.  Arrange for Emacs's signal handler
+     to be reinstalled even if this happens.
+
+     In Glib 2.73.2 (2022), commit f615eef4 changed Glib again,
+     to not install a signal handler if the system supports
+     pidfd_open and waitid (as in Linux kernel 5.3+).  The hacky
+     workaround is not needed in this case.  */
+  GSource *source = g_child_watch_source_new (getpid ());
+  catch_child_signal ();
+  g_source_unref (source);
 
-  if (!will_dump_with_unexec_p ())
+  if (lib_child_handler != dummy_handler)
     {
-#if defined HAVE_GLIB && !defined WINDOWSNT
-      /* Tickle Glib's child-handling code.  Ask Glib to install a
-         watch source for Emacs itself which will initialize glib's
-         private SIGCHLD handler, allowing catch_child_signal to copy
-         it into lib_child_handler.  This is a hacky workaround to get
-         glib's g_unix_signal_handler into lib_child_handler.
-
-         In Glib 2.37.5 (2013), commit 2e471acf changed Glib to
-         always install a signal handler when g_child_watch_source_new
-         is called and not just the first time it's called, and to
-         reset signal handlers to SIG_DFL when it no longer has a
-         watcher on that signal.  Arrange for Emacs's signal handler
-         to be reinstalled even if this happens.
-
-         In Glib 2.73.2 (2022), commit f615eef4 changed Glib again,
-         to not install a signal handler if the system supports
-         pidfd_open and waitid (as in Linux kernel 5.3+).  The hacky
-         workaround is not needed in this case.  */
-      GSource *source = g_child_watch_source_new (getpid ());
+      /* The hacky workaround is needed on this platform.  */
+      signal_handler_t lib_child_handler_glib = lib_child_handler;
       catch_child_signal ();
-      g_source_unref (source);
-
-      if (lib_child_handler != dummy_handler)
-        {
-          /* The hacky workaround is needed on this platform.  */
-          signal_handler_t lib_child_handler_glib = lib_child_handler;
-          catch_child_signal ();
-          eassert (lib_child_handler == dummy_handler);
-          lib_child_handler = lib_child_handler_glib;
-        }
+      eassert (lib_child_handler == dummy_handler);
+      lib_child_handler = lib_child_handler_glib;
+    }
 #else
-      catch_child_signal ();
+  catch_child_signal ();
 #endif
-    }
 
 #ifdef HAVE_SETRLIMIT
   /* Don't allocate more than FD_SETSIZE file descriptors for Emacs itself.  */