Revert "Don't generate .depend anymore"

This reverts commit 79af7fbf4e.

Because:

* btashton reported some issues in local builds:

  https://github.com/apache/incubator-nuttx/pull/603#issuecomment-602264860

* this might be related to the current CI breakage:

  > /bin/sh: 1: /__w/incubator-nuttx/incubator-nuttx/nuttx/tools/mkdeps: not found

.gitignore

@@ -1,3 +1,4 @@
+.depend
 Make.dep
 *.o
 *.a

arch/arm/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /locked.r
 /board

arch/arm/src/Makefile

@@ -207,14 +207,15 @@ endif
 
 # Dependencies
 
-Make.dep: Makefile chip$(DELIM)Make.defs $(SRCS)
+.depend: Makefile chip$(DELIM)Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) $(patsubst %,--dep-path %,$(subst :, ,$(VPATH))) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -230,5 +231,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/avr/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /locked.r
 /board

arch/avr/src/Makefile

@@ -163,14 +163,15 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) --dep-path chip --dep-path common --dep-path $(ARCH_SUBDIR) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -184,5 +185,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/hc/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /board
 /chip

arch/hc/src/Makefile

@@ -162,14 +162,15 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) --dep-path chip --dep-path common --dep-path $(ARCH_SUBDIR) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -183,5 +184,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/mips/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /board
 /chip

arch/mips/src/Makefile

@@ -160,14 +160,15 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) --dep-path chip --dep-path common --dep-path $(ARCH_SUBDIR) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -181,5 +182,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/misoc/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /locked.r
 /board

arch/misoc/src/Makefile

@@ -164,14 +164,15 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) --dep-path chip --dep-path common --dep-path $(ARCH_SUBDIR) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -185,5 +186,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/or1k/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /locked.r
 /board

arch/or1k/src/Makefile

@@ -202,14 +202,15 @@ endif
 
 # Dependencies
 
-Make.dep: Makefile chip$(DELIM)Make.defs $(SRCS)
+.depend: Makefile chip$(DELIM)Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) $(patsubst %,--dep-path %,$(subst :, ,$(VPATH))) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -225,5 +226,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/renesas/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

arch/renesas/src/Makefile

@@ -169,13 +169,14 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
-	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -189,5 +190,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/risc-v/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /locked.r
 /board

arch/risc-v/src/Makefile

@@ -199,14 +199,15 @@ endif
 
 # Dependencies
 
-Make.dep: Makefile $(SRCS)
+.depend: Makefile $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) $(patsubst %,--dep-path %,$(subst :, ,$(VPATH))) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) > $@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) > Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -223,6 +224,7 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 info:
 	@echo $(HEAD_OBJ)

arch/sim/src/.gitignore

@@ -1,4 +1,5 @@
 /Make.dep
+/.depend
 /Cygwin-names.dat
 /Msys-names.dat
 /Linux-names.dat

arch/sim/src/Makefile

@@ -310,13 +310,14 @@ export_startup: board/libboard$(LIBEXT) up_head.o $(HOSTOBJS)
 
 # Dependencies
 
-Make.dep: Makefile $(SRCS)
+.depend: Makefile $(SRCS)
 	$(Q) if [ -e board/Makefile ]; then \
 		$(MAKE) -C board TOPDIR="$(TOPDIR)" depend ; \
 	fi
-	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 cleanrel:
 	$(Q) rm -f nuttx.rel $(HOSTOS)-names.dat
@@ -334,6 +335,7 @@ distclean: clean
 		$(MAKE) -C board TOPDIR="$(TOPDIR)" distclean ; \
 	fi
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 	$(call DELFILE, hostfs.h)
 	$(Q) rm -rf GNU
 

arch/x86/src/.gitignore

@@ -1,3 +1,4 @@
 /chip
 /board
+/.depend
 /Make.dep

arch/x86/src/Makefile

@@ -168,14 +168,15 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) --dep-path chip --dep-path common --dep-path $(ARCH_SUBDIR) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -189,5 +190,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/x86_64/src/.gitignore

@@ -1,3 +1,4 @@
 /chip
 /board
+/.depend
 /Make.dep

arch/x86_64/src/Makefile

@@ -157,14 +157,15 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) --dep-path chip --dep-path common --dep-path $(ARCH_SUBDIR) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -178,5 +179,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/xtensa/src/.gitignore

@@ -1,3 +1,4 @@
+/.depend
 /Make.dep
 /board
 /chip

arch/xtensa/src/Makefile

@@ -161,14 +161,15 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-Make.dep: Makefile chip/Make.defs $(SRCS)
+.depend: Makefile chip/Make.defs $(SRCS)
 ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" depend
 endif
 	$(Q) $(MKDEP) --dep-path chip --dep-path common --dep-path $(ARCH_SUBDIR) \
-	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	 "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(BOARDMAKE),y)
@@ -182,5 +183,6 @@ ifeq ($(BOARDMAKE),y)
 	$(Q) $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/z16/src/.gitignore

@@ -1,4 +1,5 @@
 /Make.dep
+/.depend
 /board
 /chip
 /nuttx.linkcmd

arch/z16/src/Makefile

@@ -133,7 +133,7 @@ nuttx$(EXEEXT): $(HEAD_OBJ) board/libboard$(LIBEXT) nuttx.linkcmd
 	@echo "LD:  nuttx$(EXEEXT)"
 	$(Q) $(LD) $(LDFLAGS)
 
-Make.dep: Makefile chip/Make.defs $(DEPSRCS)
+.depend: Makefile chip/Make.defs $(DEPSRCS)
 ifeq ($(CONFIG_WINDOWS_NATIVE),y)
 	$(Q) if exist board$(DELIM)Makefile ( $(MAKE) -C board TOPDIR="$(TOPDIR)" depend )
 else
@@ -141,7 +141,8 @@ else
 		$(MAKE) -C board TOPDIR="$(TOPDIR)" depend ; \
 	fi
 endif
-	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >$@
+	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >Make.dep
+	$(Q) touch $@
 
 # This is part of the top-level export target
 
@@ -159,7 +160,7 @@ endif
 
 # Dependencies
 
-depend: Make.dep
+depend: .depend
 
 clean:
 ifeq ($(CONFIG_WINDOWS_NATIVE),y)
@@ -187,5 +188,6 @@ else
 	fi
 endif
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/z80/src/.gitignore

@@ -1,4 +1,5 @@
 /Make.dep
+/.depend
 /up_mem.h
 /asm_mem.h
 /board

arch/z80/src/Makefile.sdccl

@@ -208,13 +208,14 @@ export_startup: board/libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Build dependencies
 
-Make.dep: Makefile asm_mem.h chip/Make.defs $(DEPSRCS)
+.depend: Makefile asm_mem.h chip/Make.defs $(DEPSRCS)
 	$(Q) if [ -e board/Makefile ]; then \
 		$(MAKE) -C board TOPDIR="$(TOPDIR)" depend ; \
 	fi
-	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >$@
+	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 	$(Q) if [ -e board/Makefile ]; then \
@@ -230,5 +231,6 @@ distclean: clean
 		$(MAKE) -C board TOPDIR="$(TOPDIR)" distclean ; \
 	fi
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/z80/src/Makefile.sdccw

@@ -202,11 +202,12 @@ export_startup: board\libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Build dependencies
 
-Make.dep: Makefile asm_mem.h chip\Make.defs $(DEPSRCS)
+.depend: Makefile asm_mem.h chip\Make.defs $(DEPSRCS)
 	$(Q) if exist board\Makefile ( $(MAKE) -C board TOPDIR="$(TOPDIR)" depend )
-	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >$@
+	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 	$(Q) if exist board\Makefile ( $(MAKE) -C board TOPDIR="$(TOPDIR)" clean )
@@ -218,5 +219,6 @@ clean:
 distclean: clean
 	$(Q) if exist board\Makefile ( $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean )
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/z80/src/Makefile.zdsiil

@@ -139,11 +139,12 @@ nuttx$(EXEEXT): $(HEAD_OBJ) board$(DELIM)libboard$(LIBEXT) nuttx.linkcmd
 	@echo "LD:  nuttx$(EXEEXT)"
 	$(Q) "$(LD)" $(LDFLAGS)
 
-Make.dep: Makefile chip$(DELIM)Make.defs $(DEPSRCS)
+.depend: Makefile chip$(DELIM)Make.defs $(DEPSRCS)
 	$(Q) if [ -e board$(DELIM)Makefile ]; then \
 		$(MAKE) -C board TOPDIR="$(TOPDIR)" depend ; \
 	fi
-	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >$@
+	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >Make.dep
+	$(Q) touch $@
 
 # This is part of the top-level export target
 
@@ -157,7 +158,7 @@ export_startup: board$(DELIM)libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-depend: Make.dep
+depend: .depend
 
 clean:
 	$(Q) if [ -e board$(DELIM)Makefile ]; then \
@@ -175,5 +176,6 @@ distclean: clean
 		$(MAKE) -C board TOPDIR="$(TOPDIR)" distclean ; \
 	fi
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

arch/z80/src/Makefile.zdsiiw

@@ -128,9 +128,10 @@ nuttx$(EXEEXT): $(HEAD_OBJ) board$(DELIM)libboard$(LIBEXT) nuttx.linkcmd
 	@echo "LD:  nuttx$(EXEEXT)"
 	$(Q) "$(LD)" $(LDFLAGS)
 
-Make.dep: Makefile chip$(DELIM)Make.defs $(DEPSRCS)
+.depend: Makefile chip$(DELIM)Make.defs $(DEPSRCS)
 	$(Q) if exist board$(DELIM)Makefile ( $(MAKE) -C board TOPDIR="$(TOPDIR)" depend )
-	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >$@
+	$(Q) $(MKDEP) --dep-path chip --dep-path common "$(CC)" -- $(CFLAGS) -- $(DEPSRCS) >Make.dep
+	$(Q) touch $@
 
 # This is part of the top-level export target
 
@@ -139,7 +140,7 @@ export_startup: board$(DELIM)libboard$(LIBEXT) $(STARTUP_OBJS)
 
 # Dependencies
 
-depend: Make.dep
+depend: .depend
 
 clean:
 	$(Q) if exist board$(DELIM)Makefile ( $(MAKE) -C board TOPDIR="$(TOPDIR)" clean )
@@ -153,5 +154,6 @@ clean:
 distclean: clean
 	$(Q) if exist board$(DELIM)Makefile ( $(MAKE) -C board TOPDIR="$(TOPDIR)" distclean )
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

audio/.gitignore

@@ -1,4 +1,5 @@
 /Make.dep
+/.depend
 /*.asm
 /*.obj
 /*.rel

audio/Makefile

@@ -77,10 +77,11 @@ $(COBJS): %$(OBJEXT): %.c
 $(BIN): $(OBJS)
 	$(call ARCHIVE, $@, $(OBJS))
 
-Make.dep: Makefile $(SRCS)
+.depend: Makefile $(SRCS)
-	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 	$(call DELFILE, $(BIN))
@@ -88,5 +89,6 @@ clean:
 
 distclean: clean
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

binfmt/.gitignore

@@ -1,4 +1,5 @@
 /Make.dep
+/.depend
 /*.src
 /*.obj
 /*.asm

binfmt/Makefile

@@ -92,10 +92,11 @@ $(BINFMT_COBJS): %$(OBJEXT): %.c
 $(BIN): $(BINFMT_OBJS)
 	$(call ARCHIVE, $@, $(BINFMT_OBJS))
 
-Make.dep: Makefile $(BINFMT_SRCS)
+.depend: Makefile $(BINFMT_SRCS)
-	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(BINFMT_SRCS) >$@
+	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(BINFMT_SRCS) >Make.dep
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 clean:
 	$(call DELFILE, $(BIN))
@@ -103,5 +104,6 @@ clean:
 
 distclean: clean
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

boards/.gitignore

@@ -1,3 +1,4 @@
+.depend
 Make.dep
 *.o
 *.a
@@ -12,6 +13,7 @@ core
 .cproject
 cscope.out
 /Make.dep
+/.depend
 /*.asm
 /*.obj
 /*.rel

boards/Board.mk

@@ -119,17 +119,18 @@ ifneq ($(CXXOBJS),)
 	$(call ARCHIVE, $@, $(CXXOBJS))
 endif
 
-Make.dep: Makefile $(SRCS) $(CXXSRCS)
+.depend: Makefile $(SRCS) $(CXXSRCS)
 ifneq ($(ZDSVERSION),)
-	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
 else
-	$(Q) $(MKDEP) $(DEPPATH) $(CC) -- $(CFLAGS) -- $(SRCS) >$@
+	$(Q) $(MKDEP) $(DEPPATH) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
 endif
 ifneq ($(CXXSRCS),)
-	$(Q) $(MKDEP) $(DEPPATH) "$(CXX)" -- $(CXXFLAGS) -- $(CXXSRCS) >>$@
+	$(Q) $(MKDEP) $(DEPPATH) "$(CXX)" -- $(CXXFLAGS) -- $(CXXSRCS) >>Make.dep
 endif
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 ifneq ($(BOARD_CONTEXT),y)
 context:
@@ -142,6 +143,7 @@ clean:
 
 distclean: clean
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 	$(EXTRA_DISTCLEAN)
 
 -include Make.dep

boards/Makefile

@@ -103,15 +103,16 @@ $(CXXOBJS): %$(OBJEXT): %.cxx
 $(BIN): $(OBJS)
 	$(call ARCHIVE, $@, $(OBJS))
 
-Make.dep: Makefile $(SRCS)
+.depend: Makefile $(SRCS)
 ifneq ($(SRCS),)
-	$(Q) $(MKDEP) --dep-path . "$(CC)" -- $(CFLAGS) -- $(SRCS) >$@
+	$(Q) $(MKDEP) --dep-path . "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
 endif
 ifneq ($(CXXSRCS),)
-	$(Q) $(MKDEP) --dep-path . "$(CXX)" -- $(CXXFLAGS) -- $(CXXSRCS) >>$@
+	$(Q) $(MKDEP) --dep-path . "$(CXX)" -- $(CXXFLAGS) -- $(CXXSRCS) >>Make.dep
 endif
+	$(Q) touch $@
 
-depend: Make.dep
+depend: .depend
 
 $(DUMMY_KCONFIG): $(BOARD_KCONFIG)
 	$(call DELFILE, $(DUMMY_KCONFIG))
@@ -133,5 +134,6 @@ clean: clean_context
 
 distclean: clean
 	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
 
 -include Make.dep

boards/arm/c5471/c5471evm/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

boards/arm/cxd56xx/spresense/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

boards/arm/dm320/ntosd-dm320/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

boards/arm/efm32/efm32-g8xx-stk/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

boards/arm/efm32/efm32gg-stk3700/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

boards/arm/efm32/olimex-efm32g880f128-stk/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

boards/arm/imxrt/imxrt1020-evk/.gitignore

@@ -1 +1,3 @@
+/.depend
 /Make.dep
+src/.depend

boards/arm/imxrt/imxrt1050-evk/kernel/Makefile

@@ -109,7 +109,9 @@ $(TOPDIR)$(DELIM)User.map: nuttx_user.elf
 	$(Q) $(NM) nuttx_user.elf >$(TOPDIR)$(DELIM)User.map
 	$(Q) $(CROSSDEV)size nuttx_user.elf
 
-depend:
+.depend:
+
+depend: .depend
 
 clean:
 	$(call DELFILE, nuttx_user.elf)

boards/arm/imxrt/imxrt1060-evk/kernel/Makefile

@@ -109,7 +109,9 @@ $(TOPDIR)$(DELIM)User.map: nuttx_user.elf
 	$(Q) $(NM) nuttx_user.elf >$(TOPDIR)$(DELIM)User.map
 	$(Q) $(CROSSDEV)size nuttx_user.elf
 
-depend:
+.depend:
+
+depend: .depend
 
 clean:
 	$(call DELFILE, nuttx_user.elf)

boards/arm/kinetis/freedom-k28f/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep

boards/arm/kinetis/kwikstik-k40/src/.gitignore

@@ -1 +1,2 @@
+/.depend
 /Make.dep