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Commit 45d506bd authored by Sam Ravnborg's avatar Sam Ravnborg Committed by Sam Ravnborg
Browse files

kbuild: make V=2 tell why a target is rebuild 



tell why a a target got build
   enabled by make V=2
      Output (listed in the order they are checked):
         (1) - due to target is PHONY
         (2) - due to target missing
         (3) - due to: file1.h file2.h
         (4) - due to command line change
         (5) - due to missing .cmd file
         (6) - due to target not in $(targets)
(1) We always build PHONY targets
(2) No target, so we better build it
(3) Prerequisite is newer than target
(4) The command line stored in the file named dir/.target.cmd
    differed from actual command line. This happens when compiler
    options changes
(5) No dir/.target.cmd file (used to store command line)
(6) No dir/.target.cmd file and target not listed in $(targets)
    This is a good hint that there is a bug in the kbuild file

This patch is inspired by a patch from: Milton Miller <miltonm@bga.com>

Cc: Milton Miller <miltonm@bga.com>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent 12715d20

Makefile

+1 −0
Original line number Diff line number Diff line
@@ -1101,6 +1101,7 @@ help: 
		echo '')



	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'

	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'

	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'

	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'

	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'

scripts/Kbuild.include

+40 −1
Original line number Diff line number Diff line
@@ -129,7 +129,7 @@ endif 


# echo command. Short version is $(quiet) equals quiet, otherwise full command

echo-cmd = $(if $($(quiet)cmd_$(1)), \

	echo '  $(call escsq,$($(quiet)cmd_$(1)))';)

	echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)



# >'< substitution is for echo to work,

# >$< substitution to preserve $ when reloading .cmd file
@@ -164,3 +164,42 @@ if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ 
	@set -e;                                                             \

	$(rule_$(1)))



###

# why - tell why a a target got build

#       enabled by make V=2

#       Output (listed in the order they are checked):

#          (1) - due to target is PHONY

#          (2) - due to target missing

#          (3) - due to: file1.h file2.h

#          (4) - due to command line change

#          (5) - due to missing .cmd file

#          (6) - due to target not in $(targets)

# (1) PHONY targets are always build

# (2) No target, so we better build it

# (3) Prerequisite is newer than target

# (4) The command line stored in the file named dir/.target.cmd

#     differed from actual command line. This happens when compiler

#     options changes

# (5) No dir/.target.cmd file (used to store command line)

# (6) No dir/.target.cmd file and target not listed in $(targets)

#     This is a good hint that there is a bug in the kbuild file

ifeq ($(KBUILD_VERBOSE),2)

why =                                                                        \

    $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \

        $(if $(wildcard $@),                                                 \

            $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \

                $(if $(arg-check),                                           \

                    $(if $(cmd_$@),- due to command line change,             \

                        $(if $(filter $@, $(targets)),                       \

                            - due to missing .cmd file,                      \

                            - due to $(notdir $@) not in $$(targets)         \

                         )                                                   \

                     )                                                       \

                 )                                                           \

             ),                                                              \

             - due to target missing                                         \

         )                                                                   \

     )



echo-why = $(call escsq, $(strip $(why)))

endif