Re: [Xen-devel] [PATCH 3/7] oxenstored: refactor request processing

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Mar 30, 2016 at 04:46:58PM +0100, Jonathan Davies wrote:
[...]
> > >> Andrew's guess was close, but the wrong way around -- please could you 
> > >> try the
> > >> following with the older compiler?
> > >> 
> > >> let req = {Packet.tid=tid; Packet.rid=rid; Packet.ty=ty; 
> > >> Packet.data=data} in
> > >> 
> > >> I was using a syntactic feature of OCaml called 'field punning' which is
> > >> generally considered good practice and makes for more readable code. It 
> > >> looks
> > >> like this feature was introduced in OCaml 3.12.0 (dating from 2010), 
> > >> which is
> > >> consistent with Boris' findings.
> > >> 
> > >> What's the policy here -- is there a defined version of the OCaml 
> > >> compiler which
> > >> tools/ocaml needs to be able to compile with?
> > > 
> > > It is not explicitly listed in README or INSTALL. The ocaml tools
> > > maintainer (Dave in this case) is welcome to provide the minimum version
> > > required.
> > > 
> > > Meanwhile, I don't think we should break existing build without pinning
> > > down the minimum required version first, so we should fix Boris's
> > > breakage.  The fix seems simple enough anyway.
> > 
> > It looks like the fix is small and easy — I think this is good for now.
> > 
> > Let’s postpone requiring a later OCaml version until we really need a 
> > feature only present in a later version. I suspect this will happen 
> > eventually, probably when we try to add a dependency (e.g. from the Mirage 
> > world) which requires 4.02+.
> 
> OK; sounds sensible.
> 
> Since the original patch has already been committed to staging, I presume 
> you'd
> like me to formally submit a standalone patch that fixes this issue. I will 
> post
> it separately.
> 

Yes, a standalone patch to fix the issue is fine.

Wei.

> If I'm wrong and you'd like me to post a v2 of the whole series, let me know.
> 
> Thanks,
> Jonathan

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