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Le lundi 30 novembre 2009 Ã 21:51 +0000, Martin Guy a Ãcrit : > On 11/30/09, Lionel Landwerlin <llandwerlin@gmail.com> wrote: > > I'm using crosstool-ng to generate a cross toolchain for an x86 target > > (nothing too exciting...) and I'm kind of disappointed because I get > > some pthread_* weak symbols inside my toolchain : > > > > /opt/cross_x86/i686-cm-linux-gnu/lib/libdl-2.10.2.so > > w __pthread_getspecific > > w __pthread_key_create > > w __pthread_once > > w __pthread_setspecific > > > > I'm wondering why I don't have these weak symbols on my host system > > (debian unstable) which is an x86 too, and using the same toolchain > > (both using gcc-4.3.4 + eglibc-2.10/nptl, but binutils 2.19 in my cross > > toolchain, 2.20 on my host system). > > Does that cause any disfunction or is it just annoying? > > M > Well, after I built my toolchain, I started playing a little with buildroot. I did build a rootfs with it, containing directfb. Every directfb application I launched used to crash early in the initialization of directfb. After launching gdb on a directfb example, I found that the process was crashing with its pc at 0x0. The previous function in the stack was pthread_once. The address of the pthread_once symbol in the process was wrong (that's what I though first), it was inside the mapped code of libdl.so, instead of the mapped code of libpthread. Finally I found these weak symbols all over the toolchain. The stack was something like that : 0x0 pthread_once dlopen (I will provide stack trace later) Directfb examples'/applications' are the only binary crashing as described. But I didn't build a lot of packages and directfb might be the only binary using dlopen in my setup. Regards, -- Lionel Landwerlin -- For unsubscribe information see http://sourceware.org/lists.html#faq
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