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kbuild: Add extra gcc checks

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Add a 'W=1' Makefile switch which adds additional checking per build
object.

The idea behind this option is targeted at developers who, in the
process of writing their code, want to do the occasional

make W=1 [target.o]

and let gcc do more extensive code checking for them. Then, they
could eyeball the output for valid gcc warnings about various
bugs/discrepancies which are not reported during the normal build
process.

For more background information and a use case, read through this
thread: http://marc.info/?l=kernel-janitors&m=129802065918147&w=2

Cc: Michal Marek <[email protected]>
Cc: [email protected]
Acked-by: Sam Ravnborg <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Signed-off-by: Michal Marek <[email protected]>
This commit is contained in:
Borislav Petkov 2011-03-01 09:35:29 +01:00 • committed by Michal Marek
commit 4a5838ad9d
3 changed files with 44 additions and 1 deletions
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5
Makefile
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@ -102,6 +102,10 @@ ifeq ("$(origin O)", "command line")
KBUILD_OUTPUT := $(O)
endif
ifeq ("$(origin W)", "command line")
export KBUILD_ENABLE_EXTRA_GCC_CHECKS := 1
endif
# That's our default target when none is given on the command line
PHONY := _all
_all:
@ -1262,6 +1266,7 @@ 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 ''
@echo 'Execute "make" or "make all" to build all targets marked with [*] '
@echo 'For further info see the ./README file'