Date: Thu, 4 Feb 2016 16:32:49 -0500 From: Rich Felker <dalias@...c.org> To: Alba Pompeo <albapompeo@...il.com> Cc: r-devel <r-devel@...roject.org>, musl@...ts.openwall.com Subject: Re: Fwd: [Rd] strptime() question On Thu, Feb 04, 2016 at 04:35:22PM -0200, Alba Pompeo wrote: > I forwarded our talk on musl mailing list to R mailing list. > I got this response. > Does it help? > Also, what do you think about making a new email that's sent to both > musl and R mailing list, that way devs from both projects can > communicate? It's a tad inefficient for me to keep forwarding messages > like this back and forth. I'm cc'ing both lists now. > ---------- Forwarded message ---------- > From: Simon Urbanek <simon.urbanek@...roject.org> > Date: Thu, Feb 4, 2016 at 3:01 PM > Subject: Re: [Rd] [musl] strptime() question > To: Alba Pompeo <albapompeo@...il.com> > Cc: r-devel <r-devel@...roject.org> > > > > On Feb 4, 2016, at 11:20 AM, Alba Pompeo <albapompeo@...il.com> wrote: > > > There is incompatibility between R strptime and musl libc. I posted > > about it on their mailing list, but they need more information I can't > > provide, so I'm forwarding the message here in hope R developers can > > help. Thanks. > > Generally, it's using the standard tzset() call to set the time zone > http://pubs.opengroup.org/onlinepubs/009695399/functions/tzset.html The tzset function doesn't really do much interesting; it just updates some global state to match the current value of the TZ environment variable, but most time.h functions do this already anyway. Anyway this doesn't really answer the question of what R's strptime function is doing to add timezone functionality onto the underlying system's strptime. Is R changing the environment (this is highly unsafe in any potentially-multithreaded process, BTW)? Is it using the globals set by tzset to compute adjustments to the result? Rich
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