path: root/Makefile
diff options
authorSam Ravnborg <>2011-04-27 22:15:27 +0200
committerMichal Marek <>2011-04-28 17:59:07 +0200
commit28bc20dccadc610c56e27255aeef2938141a0cd3 (patch)
treedfaf1a2b593a25cabffe8a83e5aaf34b3c2c166d /Makefile
parent40df759e2b9ec945f1a5ddc61b3fdfbb6583257e (diff)
kbuild: implement several W= levels
Building a kernel with "make W=1" produces far too much noise to be useful. Divide the warning options in three groups: W=1 - warnings that may be relevant and does not occur too often W=2 - warnings that occur quite often but may still be relevant W=3 - the more obscure warnings, can most likely be ignored When building the whole kernel, those levels produce: W=1 - 4859 warnings W=2 - 1394 warnings W=3 - 86666 warnings respectively. Warnings have been counted with Geert's script at Many warnings occur from .h files so fixing one file may have a nice effect on the total number of warnings. With these changes I am actually tempted to try W=1 now and then. Previously there was just too much noise. Borislav: - make the W= levels exclusive - move very noisy and making little sense for the kernel warnings to W=3 - drop -Woverlength-strings due to useless warning message - copy explanatory text for the different warning levels to 'make help' - recount warnings per level Signed-off-by: Sam Ravnborg <> Signed-off-by: Borislav Petkov <> Cc: Dave Jones <> Cc: Geert Uytterhoeven <> Signed-off-by: Michal Marek <>
Diffstat (limited to 'Makefile')
1 files changed, 6 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index d7c42319fe1e..d43429f4ced8 100644
--- a/Makefile
+++ b/Makefile
@@ -103,7 +103,7 @@ ifeq ("$(origin O)", "command line")
ifeq ("$(origin W)", "command line")
# That's our default target when none is given on the command line
@@ -1274,7 +1274,11 @@ help:
@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'
- @echo ' make W=1 [targets] Enable extra gcc checks'
+ @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
+ @echo ' 1: warnings which may be relevant and do not occur too often'
+ @echo ' 2: warnings which occur quite often but may still be relevant'
+ @echo ' 3: more obscure warnings, can most likely be ignored'
@echo ''
@echo 'Execute "make" or "make all" to build all targets marked with [*] '
@echo 'For further info see the ./README file'