On 10 January 2016 at 17:09, Sébastien Villemot wrote: | Le dimanche 10 janvier 2016 à 09:56 -0600, Dirk Eddelbuettel a écrit : | | > On 8 January 2016 at 09:52, Dirk Eddelbuettel wrote: | > > | > > On 8 January 2016 at 16:44, Sébastien Villemot wrote: | > > > Le vendredi 08 janvier 2016 à 09:35 -0600, Dirk Eddelbuettel a | > > > écrit : | > > > | > > > > We can probably square this up. It smells like something due | > > > > to gcc-5 as the | > > > > same code worked for years. Every now and then we do have to | > > > > tell the | > > > > compiler to chill ... | > > > | > > > That indeed looks like a compiler problem. I am going to | > > > recompile R | > > > without optimization on the mips porterbox, to see if that helps. | > > | > > *Really* appreciate that. Am at work now and cannot dive into that. | > | > Did you get a chance to poke? Did you get anywhere, or did you get | > stuck? | | Yes I had the time to look at it. It's indeed a compiler issue. The | problem goes away if one compiles with GCC 4.9 (I could not give a try | to GCC 6, which is not yet compiled in experimental for mips).
Right. What a pain. This may throw in wrench into some of the g++-5 transition. | Optimization is already turned off for mips (and mipsel), and turning | it on again does not solve the issue. | | So the workaround that I suggest is to use GCC 4.9 on mips. It clearly | fixes the issue. That version of GCC should still remain for some time | in the archive, though I guess it will be removed at some point, maybe | even before the stretch release. Hopefully the bug in GCC 5 will be | fixed by then. | | By the way, we should enable back optimization on mips (and mipsel). | There seem to be no point of turning it off (I verified that R compiles | with GCC 5 + optimization on mipsel). Sure. [ I presume you meant gcc 4.9 with optimization. ] | I will send you a patch probably by tomorrow. Sounds good. | Then we should report the issue in GCC 5. I have a rather minimal | testcase. Great. I reported a few to doku, but he is quite swamped with all this, and I presume upstream drowns as well. I wonder if our mips porters have contacts? Dirk -- http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
