Dear Lucas De Marchi,
On Thu, 29 Aug 2013 00:55:04 -0300, Lucas De Marchi wrote:
> Hi Thomas,
>
> On Wed, Aug 28, 2013 at 12:33 PM, Thomas Petazzoni
> <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> wrote:
> > Commit 8efede20ef ("Use _Static_assert") introduced the usage of
> > _Static_assert(). However, _Static_assert() is a fairly new thing,
> > since it was introduced only in gcc 4.6. In order to support older
>
> What distro is still in gcc 4.6? Is it a LTS one?
It's not a distro. As you know, I work on the Buildroot project, a tool
that builds rootfs for embedded Linux systems using cross-compilation.
One of the package we have is obviously kmod, but since we support a
wide range of architectures, not all of them are necessarily fully
up-to-date in terms of compiler version. The specific example that
raised the problem is a gcc 4.5.x toolchain for PowerPC provided by
Mentor Graphics Sourcery CodeBench (formerly known as CodeSourcery).
> > +#if defined(HAVE_STATIC_ASSERT)
> > #define assert_cc(expr) \
> > _Static_assert((expr), #expr)
> > +#else
> > +#define assert_cc(expr)
>
> could you then define it similarly to what it was before then in this #else?
>
> I think this would do it (totally untested) with the downside of an
> ugly build error.
>
> #define assert_cc(expr) \
> do { (void) sizeof(char [1 - 2*!(expr)]); } while(0)
Sure, will fix this and resend.
Thanks!
Thomas
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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