linux-kernel - Re: [linux-next][bisected c7c133f3][gcc 4.8.5] build fail with error: first argument to ‘__builtin_choose

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Message-ID: <20180314193957.5f835d33@canb.auug.org.au>
Date:   Wed, 14 Mar 2018 19:39:57 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-next <linux-next@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>, mpe <mpe@...erman.id.au>,
        sachinp <sachinp@...ux.vnet.ibm.com>
Subject: Re: [linux-next][bisected c7c133f3][gcc 4.8.5] build fail with
 error: first argument to ‘__builtin_choose_expr’
 not a constant

Hi Abdul,

On Wed, 14 Mar 2018 13:59:54 +0530 Abdul Haleem <abdhalee@...ux.vnet.ibm.com> wrote:
>
> Today's next kernel fails to build with gcc 4.8.5 on powerpc machine.

Thanks for the report.  Just for the future, please include  the
next-XXXXXXXX tag when making reports about linux-next.

> ./include/linux/jiffies.h: In function ‘jiffies_delta_to_clock_t’:
> ./include/linux/kernel.h:855:2: error: first argument to ‘__builtin_choose_expr’ not a constant
>   __builtin_choose_expr(__builtin_constant_p(x) &&  \
>   ^
> ./include/linux/kernel.h:867:19: note: in expansion of macro ‘__max’
>  #define max(x, y) __max(typeof(x), typeof(y), x, y)
> 
> Machine Type: Power8 Baremetal
> gcc: 4.8.5
> 
> 
> Builds fine when below patch is reverted
> c7c133f3 kernel.h: skip single-eval logic on literals in min()/max()

Those patches have been removed from today's linux-next (next-20180314).

-- 
Cheers,
Stephen Rothwell

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