From 45d506bd65e2e35881d8276c111b647807823d19 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Tue, 8 Aug 2006 21:35:14 +0200 Subject: 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 Cc: Milton Miller Signed-off-by: Sam Ravnborg --- Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 22451c2ac1e0..440a1331d883 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' -- cgit v1.2.3-55-g7522