Empty elements in EMACSLOADPATH now stand for the default

* src/lread.c (load_path_check): Take path to check as argument.
(load_path_default): New, split from init_lread.
(init_lread): Move calc of default load-path to load_path_default.
Empty elements in EMACSLOADPATH now stand for the default.
(load-path): Doc fix.

* src/emacs.c (decode_env_path): Add option to treat empty elements
as nil rather than ".".

* src/callproc.c (init_callproc_1, init_callproc):
* src/image.c (Vx_bitmap_file_path):
* src/lisp.h (decode_env_path):
* lread.c (Vsource_directory):
Update for new argument spec of decode_env_path.

* leim/Makefile.in (RUN_EMACS): Empty EMACSLOADPATH rather than unsetting.

* lisp/Makefile.in (emacs): Empty EMACSLOADPATH rather than unsetting.

* test/automated/Makefile.in (emacs):
Empty EMACSLOADPATH rather than unsetting.

* doc/emacs/cmdargs.texi (General Variables):
Empty elements in EMACSLOADPATH now mean the default load-path.

* doc/lispref/loading.texi (Library Search):
Empty elements in EMACSLOADPATH now mean the default load-path.

* etc/NEWS: Mention this.

Fixes: debbugs:12100

1 files changed, 2 insertions, 3 deletions

diff --git a/src/lisp.h b/src/lisp.h
index a9aac2cc0bb..376235a402d 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -1,7 +1,6 @@
 /* Fundamental definitions for GNU Emacs Lisp interpreter.
 
-Copyright (C) 1985-1987, 1993-1995, 1997-2013 Free Software Foundation,
-Inc.
+Copyright (C) 1985-1987, 1993-1995, 1997-2013 Free Software Foundation, Inc.
 
 This file is part of GNU Emacs.
 
@@ -4058,7 +4057,7 @@ extern int initial_argc;
 #if defined (HAVE_X_WINDOWS) || defined (HAVE_NS)
 extern bool display_arg;
 #endif
-extern Lisp_Object decode_env_path (const char *, const char *);
+extern Lisp_Object decode_env_path (const char *, const char *, bool);
 extern Lisp_Object empty_unibyte_string, empty_multibyte_string;
 extern Lisp_Object Qfile_name_handler_alist;
 extern _Noreturn void terminate_due_to_signal (int, int);