On Wed, 2008-11-12 at 16:33 +0100, Bernhard Reutner-Fischer wrote: > On Wed, Nov 12, 2008 at 09:03:18AM -0600, Rob Landley wrote: > >On Wednesday 12 November 2008 06:52:07 Bernhard Reutner-Fischer wrote: > >> Hi, > >> > >> uClibc-0.9.30 has been released. > > > >Yay! > > :) > > Just as a sidenote and because there were at least three people running > into this very issue lately: > > The current gcc-3.4.6 from "hardened gentoo" miscompiles 0.9.30, > the current stable release of gcc, 4.3.2 at the time of this writing, > works just fine for me. So either fix your old compiler or use > a compiler that is somewhat current.. > > Those who tried to use gcc-3.4.6 from gentoo experienced segfaults > when running any app that was _linked_ against -lpthread, fwiw.
The problem come from a buggy gcc which did not create frame pointers (due to -fomit-frame-poitner) but the assembly tried to access it anyway. It is possible to work around it by adding -fno-omit-frame-pointer for linuxthreads.old/* as the attatched patch does. I assume the patch is not needed for newer gcc's. -nc
--- uClibc-0.9.30.orig/libpthread/linuxthreads.old/Makefile.in Thu Nov 13 09:53:27 2008 +++ uClibc-0.9.30/libpthread/linuxthreads.old/Makefile.in Thu Nov 13 10:01:35 2008 @@ -59,6 +59,13 @@ libc-static-y += $(libpthread_OUT)/libc_pthread_init.o libc-shared-y += $(libpthread_libc_OBJ:.o=.oS) +ifeq ($(TARGET_ARCH),i386) +# Most files must not be compiled without frame pointer since we need +# the frame base address which is stored in %ebp unless the frame pointer +# is optimized out. +CFLAGS += -fno-omit-frame-pointer -mpreferred-stack-boundary=4 +endif + libpthread-static-y += $(patsubst $(libpthread_DIR)/%.c,$(libpthread_OUT)/%.o,$(libpthread_SPEC_SRC)) libpthread-shared-y += $(patsubst $(libpthread_DIR)/%.c,$(libpthread_OUT)/%.oS,$(libpthread_SPEC_SRC))
_______________________________________________ uClibc mailing list uClibc@uclibc.org http://busybox.net/cgi-bin/mailman/listinfo/uclibc
