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| author | Masahiro Yamada <masahiroy@kernel.org> | 2021-02-21 16:25:24 +0100 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2021-02-22 21:59:10 +0100 |
| commit | 163ba35ff3714d7ccb57f7e4bc2bb44365c343a0 (patch) | |
| tree | df0a8647021045bbf7b5fd2d4abbc4cb4996ee5f /Documentation/process/4.Coding.rst | |
| parent | Documentation: proc.rst: add more about the 6 fields in loadavg (diff) | |
| download | linux-163ba35ff3714d7ccb57f7e4bc2bb44365c343a0.tar.xz linux-163ba35ff3714d7ccb57f7e4bc2bb44365c343a0.zip | |
doc: use KCFLAGS instead of EXTRA_CFLAGS to pass flags from command line
You should use KCFLAGS to pass additional compiler flags from the
command line. Using EXTRA_CFLAGS is wrong.
EXTRA_CFLAGS is supposed to specify flags applied only to the current
Makefile (and now deprecated in favor of ccflags-y).
It is still used in arch/mips/kvm/Makefile (and possibly in external
modules too). Passing EXTRA_CFLAGS from the command line overwrites
it and breaks the build.
I also fixed drivers/gpu/drm/tilcdc/Makefile because commit 816175dd1fd7
("drivers/gpu/drm/tilcdc: Makefile, only -Werror when no -W* in
EXTRA_CFLAGS") was based on the same misunderstanding.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Acked-by: Federico Vaga <federico.vaga@vaga.pv.it>
Link: https://lore.kernel.org/r/20210221152524.197693-1-masahiroy@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/process/4.Coding.rst')
| -rw-r--r-- | Documentation/process/4.Coding.rst | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/process/4.Coding.rst b/Documentation/process/4.Coding.rst index 0825dc496f22..1f0d81f44e14 100644 --- a/Documentation/process/4.Coding.rst +++ b/Documentation/process/4.Coding.rst @@ -242,7 +242,7 @@ and try to avoid "fixes" which make the warning go away without addressing its cause. Note that not all compiler warnings are enabled by default. Build the -kernel with "make EXTRA_CFLAGS=-W" to get the full set. +kernel with "make KCFLAGS=-W" to get the full set. The kernel provides several configuration options which turn on debugging features; most of these are found in the "kernel hacking" submenu. Several |