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Moving to C11? (was Re: Redefinition of typedefs (C11 feature))

From: Eduardo Habkost
Subject: Moving to C11? (was Re: Redefinition of typedefs (C11 feature))
Date: Fri, 11 Sep 2020 16:06:49 -0400

On Fri, Sep 11, 2020 at 08:06:10PM +0100, Peter Maydell wrote:
> On Fri, 11 Sep 2020 at 19:49, Eduardo Habkost <ehabkost@redhat.com> wrote:
> >
> > I'm wondering: do our supported build host platforms all include
> > compilers that are new enough to let us redefine typedefs?
> >
> > The ability to redefine typedefs is a C11 feature which would be
> > very useful for simplifying our QOM boilerplate code.  The
> > feature is supported by GCC since 2011 (v4.6.0)[1], and by clang
> > since 2012 (v3.1)[2].
> In configure we mandate either GCC v4.8 or better, or
> clang v3.4 or better, or XCode Clang v5.1 or better
> (Apple uses a different version numbering setup to upstream).
> So you should probably double-check that that xcode clang has
> what you want, but it looks like we're good to go otherwise.

Can anybody confirm if the following is accurate?

# Xcode 5.1 (5B130a)
Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix

If we know we have GCC 4.8+ or clang 3.4+, can we move to C11 and
start using -std=gnu11?


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