Re: [5.15-rc1][PPC][bisected 6d2ef226] mainline build breaks at ./include/linux/compiler_attributes.h:62:5: warning: "__has_attribute"

[Stephen Rothwell]

Hi Abdul,

On Tue, 14 Sep 2021 11:39:44 +0530 Abdul Haleem <abdha...@linux.vnet.ibm.com> 
wrote:
>
> Today's mainline kernel fails to compile on my powerpc box with below errors
> 
> ././include/linux/compiler_attributes.h:62:5: warning: "__has_attribute" is 
> not defined, evaluates to 0 [-Wundef]
>   #if __has_attribute(__assume_aligned__)
>       ^~~~~~~~~~~~~~~
> ././include/linux/compiler_attributes.h:62:20: error: missing binary operator 
> before token "("
>   #if __has_attribute(__assume_aligned__)
>                      ^
> ././include/linux/compiler_attributes.h:88:5: warning: "__has_attribute" is 
> not defined, evaluates to 0 [-Wundef]
>   #if __has_attribute(__copy__)
>       ^~~~~~~~~~~~~~~
> ././include/linux/compiler_attributes.h:88:20: error: missing binary operator 
> before token "("
>   #if __has_attribute(__copy__)
> 
> Kernel builds fine when below patch is reverted
> 
> commit 6d2ef22 : compiler_attributes.h: drop __has_attribute() support for 
> gcc4

Thanks for your report.

This is known and being addressed.

-- 
Cheers,
Stephen Rothwell

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