• Sam Ravnborg's avatar
    kbuild: make V=2 tell why a target is rebuild · 45d506bd
    Sam Ravnborg authored
    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>
Kbuild.include 7.99 KB