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SubjectRe: [PATCH] Makefile: Convert -Wimplicit-fallthrough to -Wimplicit-fallthrough=2
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On 8/29/19 7:02 AM, Michal Suchanek wrote:
> From gcc documentation:
>
> -Wimplicit-fallthrough=0
> disables the warning altogether.
> -Wimplicit-fallthrough=1
> matches .* regular expression, any comment is used as fallthrough comment.
> -Wimplicit-fallthrough=2
> case insensitively matches .*falls?[ \t-]*thr(ough|u).* regular expression.
> -Wimplicit-fallthrough=3
> case sensitively matches one of the following regular expressions:
> -fallthrough
> @fallthrough@
> lint -fallthrough[ \t]*
> [ \t.!]*(ELSE,? |INTENTIONAL(LY)? )?
> FALL(S | |-)?THR(OUGH|U)[ \t.!]*(-[^\n\r]*)?
> [ \t.!]*(Else,? |Intentional(ly)? )?
> Fall((s | |-)[Tt]|t)hr(ough|u)[ \t.!]*(-[^\n\r]*)?
> [ \t.!]*([Ee]lse,? |[Ii]ntentional(ly)? )?
> fall(s | |-)?thr(ough|u)[ \t.!]*(-[^\n\r]*)?
> -Wimplicit-fallthrough=4
> case sensitively matches one of the following regular expressions:
> -fallthrough
> @fallthrough@
> lint -fallthrough[ \t]*
> [ \t]*FALLTHR(OUGH|U)[ \t]*
> -Wimplicit-fallthrough=5
> doesn’t recognize any comments as fallthrough comments, only attributes disable the warning.
>
> In particular the default value of 3 does not match the comments like
> /* falls through to do foobar */
> generating suprious warnings on properly annotated code.
>

NACK

How many of those case do you see? if any...

In any case, those comments can be easily transformed to:

/* falls through - to do foobar */

like in this case:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d2d833e0bf2bad221a955626b942b38312630894

Also, notice that code in linux-next is already ahead... :

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e2079e93f562c7f7a030eb7642017ee5eabaaa10

--
Gustavo

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