strace config test failures

[Dmitry V. Levin]

Hi,

On Fri, Aug 26, 2016 at 01:31:55PM -0700, Vineet Gupta wrote:
> Hi,
> 
> I was trying to cross build strace tip for ARC which was failing in weird ways -
> running bootstrap cured it.
> 
> However in the process - when starring at config.log I see a lot config test
> failures (even when configuring for host x86_64)
> 
> --------->8------
> configure:7208: gcc -c -g -O2  conftest.c >&5
> conftest.c: In function 'main':
> conftest.c:66:21: error: expected expression before ')' token
>  if (sizeof ((mode_t)))
>                      ^
> configure:7208: $? = 1
> configure: failed program was:
> --------->8------

This is AC_TYPE_MODE_T autoconf macro, it results to
checking for mode_t... yes
on all systems where I've tried to build strace.

> It seems there is an extra set of parentheses which causes this.... I mean those
> tests would pass otherwise
> Is this expected, are others seeing this too....  Is this due to Ubuntu host 16.04
> 
> gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.2)
> autoconf (GNU Autoconf) 2.69


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