[musl] 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 at libc.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 at r-project.org> Date: Thu, Feb 4, 2016 at 3:01 PM Subject: Re: [Rd] [musl] strptime() question To: Alba Pompeo <albapompeo at gmail.com> Cc: r-devel <r-devel at r-project.org> On Feb 4, 2016, at 11:20 AM, Alba Pompeo <albapompeo at gmail.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