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    Subject[PATCH 12/28] kbuild: make V=2 tell why a target is rebuild
    Date
    From: Sam Ravnborg <sam@mars.ravnborg.org>

    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: Sam Ravnborg <sam@ravnborg.org>
    ---
    Makefile | 1 +
    scripts/Kbuild.include | 41 ++++++++++++++++++++++++++++++++++++++++-
    2 files changed, 41 insertions(+), 1 deletions(-)
    diff --git a/Makefile b/Makefile
    index 22451c2..440a133 100644
    --- a/Makefile
    +++ b/Makefile
    @@ -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'
    diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
    index 1d6ffb2..3d52389 100644
    --- a/scripts/Kbuild.include
    +++ b/scripts/Kbuild.include
    @@ -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-pre
    @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
    --
    1.4.1
    -
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