Can it be related to this? https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32219 My toolchain seems to have the suggested patch applied. (I have not tried to rebuild gcc without it, so might be unrelated ) That bugzilla also suggest that weak+hidden is somewhat unclearly defined. Maybe Lttng's use of weak+hidden is the problem here? 2014-05-13 5:37 GMT+02:00 Martin Ünsal <martinunsal@xxxxxxxxx>: > Henrik, that is interesting. I will try removing weak attribute and > see if that helps. Thanks for the tip. > > An update from my own investigation: I am only seeing this problem > with GCC 4.7.2 when I build it from OpenEmbedded "gcc-cross" package > (dylan branch). OpenEmbedded applies a lot of patches to GCC and my > only guess is that one of these patches is causing my problem (or > perhaps something else about OE build environment). When I build GCC > from scratch directly from Gnu distribution for GCC 4.6.4, 4.7.2, or > 4.8.2, they all work exactly as expected. In all cases I am using > x86_64 host, arm-linux-gnueabi target. So at this point for me this is > an OpenEmbedded bug, not a GCC bug. > > On Thu, May 8, 2014 at 12:31 AM, Henrik Wallin <henrikwallin72@xxxxxxxxx> wrote: >> Hi, >> >> (Reply to: http://gcc.gnu.org/ml/gcc-help/2014-05/msg00005.html) >> >> I think I see the same problems, but for powerpc. >> The problems is seen with gcc 4.8.1. It works good with gcc 4.6.3. >> The original lttng problem can not be seen with an x86 system (not >> sure why yet), but the code snippet below seems to trigger for x86 as >> well. >> >> I've tried to construct a shorted down variant of what I think is happening. >> Hopefully it matches what is happening in the real lttng case. >> I hope it can shed some light to this issue. >> Is it gcc / binutils problem? Or wrong use of attributes from lttng's side? >> >> Attached is a bug.c file. See the comments how to build. >> >> Removing the "weak" attribute will make things work for all tested toolchains. >> I've seen some indications that using weak+hidden might be considered >> "bad practice" >> (e.g. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32219) -- / Henrik
