ac_prog_cc_stdc on Ubuntu 14.04 where it was failing for me evaluates to c11

On Tue, Apr 10, 2018 at 12:23 AM, Andre McCurdy <armccu...@gmail.com> wrote:

> On Sun, Apr 8, 2018 at 5:52 PM, Khem Raj <raj.k...@gmail.com> wrote:
> > On Sun, Apr 8, 2018 at 10:00 AM Martin Jansa <martin.ja...@gmail.com>
> wrote:
> >
> >> On Ubuntu 14.04 this fails with:
> >>
> >> ../git/gen-des-tables.c: In function ‘write_table_u8’:
> >> ../git/gen-des-tables.c:307:3: error: ‘for’ loop initial declarations
> are
> >> only allowed in C99 mode
> >>    for (size_t i = 0; i < m; i++)
> >>    ^
> >
> > You can patch this to move declaration just above loop if that helps we
> > should apply such a patch for compatibility sake but I wonder if there
> are
> > more c99 assumptions at work here
>
> It looks like the upstream intention is to be buildable with c99 + GNU
> extensions, so explicitly setting -std=gnu99 seems reasonable.
>
>   https://github.com/besser82/libxcrypt#portability-notes
>
> There even seems to be a configure check for it, so not sure why
> Centos6 etc get through to a build failure?
>
>   https://github.com/besser82/libxcrypt/blob/develop/configure.ac#L33
>
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