Re: GCC switch to C11 causes many testsuite compiler diagnostics

[Andreas Arnez <arnez at linux dot vnet dot ibm dot com>]

On Sat, Oct 25 2014, Sandra Loosemore wrote:

> Comparing my latest nios2 test results (with Pedro's thread patch)
> with those from a checkout a couple weeks old, I noticed I had some
> new ERRORs due to apparent compilation failures.  I tracked this down
> to the recent change on GCC mainline (r216247) to make the default C
> dialect GNU11, which enables -Wimplicit-int and
> -Wimplicit-function-declaration by default.  I started working on a
> patch to fix the offending testcases, but realized that there are
> hundreds of them.  :-(

The warnings appear in our S390 testing as well, so I've been working on
a fix already, as announced here:

  https://sourceware.org/ml/gdb-testers/2014-q4/msg00037.html

In the meantime I've completed a patch set; maybe you'd like to check
that it does fix the warnings on NIOS2:

  https://sourceware.org/ml/gdb-patches/2014-10/msg00802.html

>
> So, before I invest a lot more time on this, is updating the GDB
> testsuite to use a more modern C dialect the Right Thing To Do?  I'm
> also wondering if it's really necessary to support compilers that
> can't handle function prototypes in the testsuite (not defining
> PROTOTYPES seems to be the default, in fact).

AFAIK there's no need to support pre-C89 compilers that can't handle
function prototypes.  GDB itself can't be compiled with such a compiler,
and many GDB test cases wouldn't work either.

--
Andreas