Date: Sat, 6 Feb 2016 10:35:28 -0200 From: Alba Pompeo <albapompeo@...il.com> To: Rich Felker <dalias@...c.org> Cc: r-devel <r-devel@...roject.org>, musl@...ts.openwall.com Subject: Re: Fwd: [Rd] strptime() question It is setting TZ and using tzset(). R is not multi-threaded so it is safe. Simon figure out the important settings from the config.log and config.h files on a musl system: /* #undef USE_INTERNAL_MKTIME */ #define HAVE_TM_GMTOFF 1 #define HAVE_TM_ZONE 1 Does this help anyone debug the issue? Simon just went on vacation. On Thu, Feb 4, 2016 at 7:32 PM, Rich Felker <dalias@...c.org> wrote: > 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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