[linux-next][bisected c7c133f3][gcc 4.8.5] build fail with error: first argument to ‘__builtin_choose_expr’ not a constant

Stephen Rothwell sfr at canb.auug.org.au
Wed Mar 14 19:39:57 AEDT 2018

Hi Abdul,

On Wed, 14 Mar 2018 13:59:54 +0530 Abdul Haleem <abdhalee at linux.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).

Stephen Rothwell
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