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

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Date:   Tue, 14 Sep 2021 11:39:44 +0530
From:   Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
To:     linux-kernel <linux-kernel@...r.kernel.org>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-next <linux-next@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        sachinp <sachinp@...ux.vnet.ibm.com>, ndesaulniers@...gle.com,
        ojeda@...nel.org
Subject: [5.15-rc1][PPC][bisected 6d2ef226] mainline build breaks at
 ./include/linux/compiler_attributes.h:62:5: warning: "__has_attribute"

Greeting's

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

-- 
Regard's

Abdul Haleem
IBM Linux Technology Center


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