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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
Documentation/kbuild/kbuild.txt
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@ -196,3 +196,8 @@ to be included in the databases, separated by blank space. E.g.:
To get all available archs you can also specify all. E.g.:
$ make ALLSOURCE_ARCHS=all tags
KBUILD_ENABLE_EXTRA_GCC_CHECKS
--------------------------------------------------
If enabled over the make command line with "W=1", it turns on additional
gcc -W... options for more extensive build-time checking.