On 14/09/2018 04:27, Joel Sherrill wrote:
On Thu, Sep 13, 2018, 9:25 PM Chris Johns <chr...@rtems.org <mailto:chr...@rtems.org>> wrote:On 14/09/2018 10:13, Joel Sherrill wrote: > On Thu, Sep 13, 2018, 5:40 PM Chris Johns <chr...@rtems.org <mailto:chr...@rtems.org> > <mailto:chr...@rtems.org <mailto:chr...@rtems.org>>> wrote: > On 14/09/2018 02:30, Joel Sherrill wrote: > > On Thu, Sep 13, 2018, 10:34 AM Sebastian Huber > > <sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de> > <mailto:sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de>> > <mailto:sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de> > <mailto:sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de>>>> > > wrote: > > ----- Am 13. Sep 2018 um 14:07 schrieb joel j...@rtems.org <mailto:j...@rtems.org> > <mailto:j...@rtems.org <mailto:j...@rtems.org>> > > <mailto:j...@rtems.org <mailto:j...@rtems.org> <mailto:j...@rtems.org <mailto:j...@rtems.org>>>: > > > > > On Thu, Sep 13, 2018, 3:28 AM Sebastian Huber < > > > sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de> > <mailto:sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de>> > > <mailto:sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de> > <mailto:sebastian.hu...@embedded-brains.de <mailto:sebastian.hu...@embedded-brains.de>>>> wrote: > > > > > >> Hello, > > >> > > >> I test currently the tqm8xx BSP which worked fine until RTEMS 5. The > > >> problem is that this BSP uses strtoul() to get some system > configuration > > >> parameters from the boot loader. The Newlib used by RTEMS 5 has now > > >> support for C locales in strtoul(). The C locale support needs an > > >> executing thread with a valid Newlib reentrancy structure. This is > > >> definitely not the case during bsp_start(). > > >> > > > > > > Why do we now longer have a global reentrancy structure to fall back on? > > > > I think having a global reentrancy as a fall back just for the lowest > level > > system start without an idle thread is a bit of overkill. > > > > The heavy weight C local support which was recently introduced in > Newlib is > > not really the right thing for the embedded systems I know. There were > > several complaints about this on the Newlib mailing list as well. The > root > > cause for this is the C standard. So, basically the C standard > strtoul() is > > unsuitable for embedded systems. The FreeBSD (sys/kern/strtoul.c) and > Linux > > (lib/kstrtox.c) kernel have their own implementations. > > > > > > FWIW the FACE Technical Standard does not include wide characters in ANY > profile > > as of Edition 3.0. None of the RTOS vendors knew of any avionics users. It > > wasn't viewed as a necessary feature. We could consider disabling it by > default. > > > > Is this something we could ot would want to control with newlib via a config > option? > > > We don't turn on locale for h8, m32c and maybe not epiphany. I am pretty sure.it <http://sure.it> > <http://sure.it> is an option. And should be a documented RSB option to turn it > back on. Should be a size savings for most users. We turn on or off as an option? Based on Sebastian's observation, I think off. Does this impact wide characters and multibyte?We will need to document the impact. I suspect it removes some POSIX support in a base build.
This problem with the C locale support used in strtoul() has absolutely nothing to do with the wide character or iconv() support.
Currently it is not possible to disable the C locale support in Newlib. Would such an option be the preferred way instead of a custom strtoul() etc. API and implementation?
-- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.hu...@embedded-brains.de PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
