Revert part of 59732a83c8 to fix bug#52969

While we don't need to put docstrings of .elc files into etc/DOC,
we still need to put those of `loaddefs.el` there since we don't have
a "dynamic docstring" feature for the non-compiled files and keeping
the actual docstrings in the heap would be prohibitive.

* src/Makefile.in ($(etc)/DOC): Scan `lisp/loaddefs.el` still.

* lib-src/make-docfile.c (scan_lisp_file): New function.
(scan_file): Use it.
(skip_white, read_lisp_symbol, search_lisp_doc_at_eol): New functions.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/Makefile.in b/src/Makefile.in
index 6379582660c..83210b1317a 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -642,11 +642,13 @@ endif
 ## for the first time, this prevents any variation between configurations
 ## in the contents of the DOC file.
 ##
-$(etc)/DOC: $(libsrc)/make-docfile$(EXEEXT) $(doc_obj)
+$(etc)/DOC: $(libsrc)/make-docfile$(EXEEXT) $(doc_obj) $(lispsource)/loaddefs.el
         $(AM_V_GEN)$(MKDIR_P) $(etc)
         $(AM_V_at)rm -f $(etc)/DOC
         $(AM_V_at)$(libsrc)/make-docfile -d $(srcdir) \
           $(SOME_MACHINE_OBJECTS) $(doc_obj) > $(etc)/DOC
+        $(AM_V_at)$(libsrc)/make-docfile -a $(etc)/DOC -d $(lispsource) \
+          loaddefs.el
 
 $(libsrc)/make-docfile$(EXEEXT) $(libsrc)/make-fingerprint$(EXEEXT): \
   $(lib)/libgnu.a