make it possible to have include/applets.h-esque entries in .c files

As an example, bunzip2 and bzcat is changed to use it.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

Makefile

@@ -358,11 +358,16 @@ scripts_basic:
 # To avoid any implicit rule to kick in, define an empty command.
 scripts/basic/%: scripts_basic ;
 
+# This target generates Kbuild's and Config.in's from *.c files
+PHONY += gen_build_files
+gen_build_files:
+	$(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree)
+
 # bbox: we have helpers in applets/
 # we depend on scripts_basic, since scripts/basic/fixdep
 # must be built before any other host prog
 PHONY += applets_dir
-applets_dir: scripts_basic
+applets_dir: scripts_basic gen_build_files
 	$(Q)$(MAKE) $(build)=applets
 
 applets/%: applets_dir ;
@@ -377,11 +382,6 @@ ifneq ($(KBUILD_SRC),)
 	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 endif
 
-# This target generates Kbuild's and Config.in's from *.c files
-PHONY += gen_build_files
-gen_build_files:
-	$(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree)
-
 # To make sure we do not include .config for any of the *config targets
 # catch them early, and hand them over to scripts/kconfig/Makefile
 # It is allowed to specify more targets when calling make, including
@@ -446,7 +446,7 @@ else
 ifeq ($(KBUILD_EXTMOD),)
 # Additional helpers built in scripts/
 # Carefully list dependencies so we do not try to build scripts twice
-# in parrallel
+# in parallel
 PHONY += scripts
 scripts: gen_build_files scripts_basic include/config/MARKER
 	$(Q)$(MAKE) $(build)=$(@)

Makefile.custom

@@ -2,7 +2,7 @@
 # Build system
 # ==========================================================================
 
-busybox.links: $(srctree)/applets/busybox.mkll $(objtree)/include/autoconf.h $(srctree)/include/applets.h
+busybox.links: $(srctree)/applets/busybox.mkll $(objtree)/include/autoconf.h include/applets.h
 	$(Q)-$(SHELL) $^ >$@
 
 .PHONY: install

applets/Kbuild.src

@@ -27,9 +27,9 @@ HOSTCFLAGS_usage_pod.o = -I$(srctree_slash)include -Iinclude
 
 applets/applets.o: include/usage_compressed.h include/applet_tables.h
 
-applets/applet_tables: .config $(srctree_slash)include/applets.h
+applets/applet_tables: .config include/applets.h
-applets/usage:         .config $(srctree_slash)include/applets.h
+applets/usage:         .config include/applets.h
-applets/usage_pod:     .config include/applet_tables.h $(srctree_slash)include/applets.h
+applets/usage_pod:     .config include/applet_tables.h include/applets.h
 
 quiet_cmd_gen_usage_compressed = GEN     include/usage_compressed.h
       cmd_gen_usage_compressed = $(srctree_slash)applets/usage_compressed include/usage_compressed.h applets

archival/bbunzip.c

@@ -304,6 +304,8 @@ int gunzip_main(int argc UNUSED_PARAM, char **argv)
  *
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
+//applet:IF_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP))
+//applet:IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP, bzcat))
 #if ENABLE_BUNZIP2
 static
 IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(unpack_info_t *info UNUSED_PARAM)

include/applets.src.h

@@ -62,6 +62,7 @@ s     - suid type:
 #endif
 
 
+INSERT
 IF_TEST(APPLET_NOFORK([,  test, _BB_DIR_USR_BIN, _BB_SUID_DROP, test))
 IF_TEST(APPLET_NOFORK([[, test, _BB_DIR_USR_BIN, _BB_SUID_DROP, test))
 IF_ACPID(APPLET(acpid, _BB_DIR_SBIN, _BB_SUID_DROP))
@@ -82,8 +83,6 @@ IF_BEEP(APPLET(beep, _BB_DIR_USR_BIN, _BB_SUID_DROP))
 IF_BLKID(APPLET(blkid, _BB_DIR_SBIN, _BB_SUID_DROP))
 IF_BOOTCHARTD(APPLET(bootchartd, _BB_DIR_SBIN, _BB_SUID_DROP))
 IF_BRCTL(APPLET(brctl, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
-IF_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP))
-IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP, bzcat))
 IF_BZIP2(APPLET(bzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP))
 IF_CAL(APPLET(cal, _BB_DIR_USR_BIN, _BB_SUID_DROP))
 IF_CAT(APPLET_NOFORK(cat, cat, _BB_DIR_BIN, _BB_SUID_DROP, cat))

scripts/Makefile.IMA

@@ -203,5 +203,5 @@ applets/applet_tables: include/autoconf.h
 include/usage_compressed.h: $(srctree)/include/usage.h applets/usage
 	$(srctree)/applets/usage_compressed include/usage_compressed.h applets
 
-include/applet_tables.h: $(srctree)/include/applets.h
+include/applet_tables.h: include/applets.h
 	applets/applet_tables include/applet_tables.h

scripts/gen_build_files.sh

@@ -7,6 +7,27 @@ cd -- "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
 
 srctree="$1"
 
+# (Re)generate include/applets.h
+src="$srctree/include/applets.src.h"
+dst="include/applets.h"
+s=`sed -n 's@^//applet:@@p' -- */*.c */*/*.c`
+echo "/* DO NOT EDIT. This file is generated from applets.src.h */" >"$dst.$$.tmp"
+# Why "IFS='' read -r REPLY"??
+# This atrocity is needed to read lines without mangling.
+# IFS='' prevents whitespace trimming,
+# -r suppresses backslash handling.
+while IFS='' read -r REPLY; do
+	test x"$REPLY" = x"INSERT" && REPLY="$s"
+	printf "%s\n" "$REPLY"
+done <"$src" >>"$dst.$$.tmp"
+if test -f "$dst" && cmp -s "$dst.$$.tmp" "$dst"; then
+	rm -- "$dst.$$.tmp"
+else
+	echo "  GEN     $dst"
+	mv -- "$dst.$$.tmp" "$dst"
+fi
+
+# (Re)generate */Kbuild and */Config.in
 find -type d | while read -r d; do
 	d="${d#./}"
 	src="$srctree/$d/Kbuild.src"
@@ -15,17 +36,12 @@ find -type d | while read -r d; do
 		#echo "  CHK     $dst"
 
 		s=`sed -n 's@^//kbuild:@@p' -- "$srctree/$d"/*.c`
-		echo "# DO NOT EDIT. This file is generated from Kbuild.src" >"$dst.$$.tmp"
 
-		# Why "IFS='' read -r REPLY"??
+		echo "# DO NOT EDIT. This file is generated from Kbuild.src" >"$dst.$$.tmp"
-		# This atrocity is needed to read lines without mangling.
-		# IFS='' prevents whitespace trimming,
-		# -r suppresses backslash handling.
 		while IFS='' read -r REPLY; do
 			test x"$REPLY" = x"INSERT" && REPLY="$s"
 			printf "%s\n" "$REPLY"
 		done <"$src" >>"$dst.$$.tmp"
-
 		if test -f "$dst" && cmp -s "$dst.$$.tmp" "$dst"; then
 			rm -- "$dst.$$.tmp"
 		else
@@ -40,13 +56,12 @@ find -type d | while read -r d; do
 		#echo "  CHK     $dst"
 
 		s=`sed -n 's@^//config:@@p' -- "$srctree/$d"/*.c`
-		echo "# DO NOT EDIT. This file is generated from Config.src" >"$dst.$$.tmp"
 
+		echo "# DO NOT EDIT. This file is generated from Config.src" >"$dst.$$.tmp"
 		while IFS='' read -r REPLY; do
 			test x"$REPLY" = x"INSERT" && REPLY="$s"
 			printf "%s\n" "$REPLY"
 		done <"$src" >>"$dst.$$.tmp"
-
 		if test -f "$dst" && cmp -s "$dst.$$.tmp" "$dst"; then
 			rm -- "$dst.$$.tmp"
 		else