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| author | Sam Ravnborg <sam@mars.ravnborg.org> | 2006-08-08 21:35:14 +0200 |
|---|---|---|
| committer | Sam Ravnborg <sam@neptun.ravnborg.org> | 2006-09-25 09:01:49 +0200 |
| commit | 45d506bd65e2e35881d8276c111b647807823d19 (patch) | |
| tree | 8f53e4e58165fc2c7f62e17b31dfb77ef43d7dfc | |
| parent | 12715d20af9fd9179daca7a1cd2cf3db3c2c494f (diff) | |
| download | linux-45d506bd65e2e35881d8276c111b647807823d19.tar.gz linux-45d506bd65e2e35881d8276c111b647807823d19.tar.bz2 linux-45d506bd65e2e35881d8276c111b647807823d19.zip | |
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: Sam Ravnborg <sam@ravnborg.org>
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | scripts/Kbuild.include | 41 |
2 files changed, 41 insertions, 1 deletions
@@ -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 1d6ffb26e20f..3d523899fdc0 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-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 |