patch 8.1.2005: the regexp.c file is too big

Problem:    The regexp.c file is too big.
Solution:   Move the backtracking engine to a separate file. (Yegappan
            Lakshmanan, closes #4905)

Filelist

@@ -92,6 +92,7 @@ SRC_ALL =	\
 		src/profiler.c \
 		src/quickfix.c \
 		src/regexp.c \
+		src/regexp_bt.c \
 		src/regexp_nfa.c \
 		src/regexp.h \
 		src/scriptfile.c \

src/Make_cyg_ming.mak

@@ -1179,7 +1179,7 @@ $(OUTDIR)/os_w32exeg.o:	os_w32exe.c $(INCL)
 $(OUTDIR)/os_win32.o:	os_win32.c $(INCL) $(MZSCHEME_INCL)
 	$(CC) -c $(CFLAGS) os_win32.c -o $@
 
-$(OUTDIR)/regexp.o:	regexp.c regexp_nfa.c $(INCL)
+$(OUTDIR)/regexp.o:	regexp.c regexp_bt.c regexp_nfa.c $(INCL)
 	$(CC) -c $(CFLAGS) regexp.c -o $@
 
 $(OUTDIR)/terminal.o:	terminal.c $(INCL) $(TERM_DEPS)

src/Make_mvc.mak

@@ -1637,7 +1637,7 @@ $(OUTDIR)/profiler.obj:	$(OUTDIR) profiler.c  $(INCL)
 
 $(OUTDIR)/quickfix.obj:	$(OUTDIR) quickfix.c  $(INCL)
 
-$(OUTDIR)/regexp.obj:	$(OUTDIR) regexp.c regexp_nfa.c  $(INCL)
+$(OUTDIR)/regexp.obj:	$(OUTDIR) regexp.c regexp_bt.c regexp_nfa.c  $(INCL)
 
 $(OUTDIR)/scriptfile.obj:	$(OUTDIR) scriptfile.c  $(INCL)
 

src/Makefile

@@ -3326,7 +3326,7 @@ objects/pty.o: pty.c
 objects/quickfix.o: quickfix.c
 	$(CCC) -o $@ quickfix.c
 
-objects/regexp.o: regexp.c regexp_nfa.c
+objects/regexp.o: regexp.c regexp_bt.c regexp_nfa.c
 	$(CCC) -o $@ regexp.c
 
 objects/scriptfile.o: scriptfile.c
@@ -3794,7 +3794,7 @@ objects/quickfix.o: quickfix.c vim.h protodef.h auto/config.h feature.h os_unix.
 objects/regexp.o: regexp.c vim.h protodef.h auto/config.h feature.h os_unix.h \
  auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
- proto.h globals.h regexp_nfa.c
+ proto.h globals.h regexp_bt.c regexp_nfa.c
 objects/scriptfile.o: scriptfile.c vim.h protodef.h auto/config.h feature.h os_unix.h \
  auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2005,
 /**/
     2004,
 /**/