Re: [PATCH] [v2] Kbuild: move to -std=gnu11

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On Mon, Feb 28, 2022 at 12:25 PM Mark Rutland <mark.rutland@xxxxxxx> wrote:
> On Mon, Feb 28, 2022 at 11:27:43AM +0100, Arnd Bergmann wrote:
> >
> > Nathan Chancellor reported an additional -Wdeclaration-after-statement
> > warning that appears in a system header on arm, this still needs a
> > workaround.
> FWIW, I had a go at moving to c99 a few weeks ago (to be able to use
> for-loop-declarations in some concurrency primitives), and when I tried, I also
> saw declaration-after-statement warnings when building modpost.c, which is easy
> enough to fix:

I think the KBUILD_USERCFLAGS portion and the modpost.c fix for it
make sense regardless of the -std=gnu11 change, but your change
to KBUILD_CFLAGS is not actually needed because the warning is
already enabled there -- gnu89 allows intermingled declarations since
gcc-3.4, so the warning flag was added during early 2.6.x kernels.

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