minimize dependency list for generated .c files

gcc/cobol/Make-lang.in

@@ -161,9 +161,14 @@ gcobol$(exeext): \
 
 # First, files needed for parsing:
 
-# Since we didn't attempt to automate determining .h prerequisites for 
-# parse.y, cdf.y, and scan.l, and because some of the .h files reference each
-# other, I opted for the nuclear option:  RJD
+# To establish prerequisites for parse.o, cdf.o, and scan.o,
+#   1. capture the "make -n" output 
+#   2. eliminate compiler options, leaving only preprocessor options (-D and -I)
+#   3. add -E -MM
+#
+# Below is postprocessed: the files are one per line, used "realpath
+# --relative-to=$PWD" to rationalize them, and sorted.
+
 ALL_H_FILES = $(wildcard $(srcdir)/cobol/*.h) $(wildcard $(srcdir)/../libgcobol/*.h) 
 
 cobol/parse.c: cobol/parse.y $(ALL_H_FILES)
@@ -178,7 +183,80 @@ cobol/cdf.c: cobol/cdf.y  $(ALL_H_FILES)
 cobol/scan.c: cobol/scan.l  $(ALL_H_FILES)
 	$(LEX) -o$@ $(LFLAGS) $<
 
-cobol/scan.o: cobol/parse.c 
+cdf.o: cobol/cdf.c				\
+	../../gcc/cobol/cbldiag.h		\
+	../../gcc/cobol/cdfval.h		\
+	../../gcc/cobol/copybook.h		\
+	../../gcc/cobol/symbols.h		\
+	../../gcc/cobol/util.h			\
+	../../libgcobol/common-defs.h		\
+	../../libgcobol/ec.h			\
+	../../libgcobol/ec.h			\
+	cobol/cdf.h				\
+	include/limits.h			\
+	include/stdint.h			\
+	include/syslimits.h 
+
+parse.o: cobol/parse.c				\
+	../../gcc/cobol/cbldiag.h		\
+	../../gcc/cobol/cdfval.h		\
+	../../gcc/cobol/cobol-system.h		\
+	../../gcc/cobol/exceptg.h		\
+	../../gcc/cobol/genapi.h		\
+	../../gcc/cobol/genapi.h		\
+	../../gcc/cobol/inspect.h		\
+	../../gcc/cobol/inspect.h		\
+	../../gcc/cobol/parse_ante.h		\
+	../../gcc/cobol/parse_util.h		\
+	../../gcc/cobol/symbols.h		\
+	../../gcc/cobol/util.h			\
+	../../gcc/hwint.h			\
+	../../gcc/system.h			\
+	../../include/ansidecl.h		\
+	../../include/ansidecl.h		\
+	../../include/filenames.h		\
+	../../include/hashtab.h			\
+	../../include/libiberty.h		\
+	../../include/safe-ctype.h		\
+	../../libgcobol/common-defs.h		\
+	../../libgcobol/ec.h			\
+	../../libgcobol/ec.h			\
+	../../libgcobol/exceptl.h		\
+	../../libgcobol/io.h			\
+	auto-host.h				\
+	cobol/parse.h				\
+	config.h 
+
+scan.o: cobol/scan.c				\
+	../../gcc/cobol/cbldiag.h		\
+	../../gcc/cobol/cdfval.h		\
+	../../gcc/cobol/cobol-system.h		\
+	../../gcc/cobol/copybook.h		\
+	../../gcc/cobol/dts.h			\
+	../../gcc/cobol/inspect.h		\
+	../../gcc/cobol/lexio.h			\
+	../../gcc/cobol/scan_ante.h		\
+	../../gcc/cobol/scan_post.h		\
+	../../gcc/cobol/symbols.h		\
+	../../gcc/cobol/symbols.h		\
+	../../gcc/cobol/util.h			\
+	../../gcc/hwint.h			\
+	../../gcc/system.h			\
+	../../include/ansidecl.h		\
+	../../include/ansidecl.h		\
+	../../include/filenames.h		\
+	../../include/hashtab.h			\
+	../../include/libiberty.h		\
+	../../include/safe-ctype.h		\
+	../../libgcobol/common-defs.h		\
+	../../libgcobol/ec.h			\
+	../../libgcobol/ec.h			\
+	../../libgcobol/exceptl.h		\
+	../../libgcobol/io.h			\
+	auto-host.h				\
+	cobol/cdf.h				\
+	cobol/parse.h				\
+	config.h 
 
 # And the cobol1.exe front end