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

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Message-Id: <1521016194.31953.9.camel@abdul.in.ibm.com>
Date:   Wed, 14 Mar 2018 13:59:54 +0530
From:   Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
To:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc:     linux-next <linux-next@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Kees Cook <keescook@...omium.org>, mpe <mpe@...erman.id.au>,
        sachinp <sachinp@...ux.vnet.ibm.com>
Subject: [linux-next][bisected c7c133f3][gcc 4.8.5] build fail with error:
 first argument to
 ‘__builtin_choose_expr’ not a constant

Greetings,

Today's next kernel fails to build with gcc 4.8.5 on powerpc machine.


./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()

-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre