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

Hi Abdul,

On Tue, 14 Sep 2021 11:39:44 +0530 Abdul Haleem [off-list ref] 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