On Jan 3, 2012 7:11 PM, "Carmelo AMOROSO" <[email protected]> wrote: > > Build raise and abort function with dwarf2 info by using > -fasynchronous-unwind-tables to make backtrace() working across a > call to abort. > > A scenario where it could be useful is within a signal handler that > wants to dump a backtrace when catching some signal (i.e SIGABRT). > Without having abort & raise built with DWARF2 information, it is not > possible for the libgcc stack unwinder to walk through the call stack > out of the abort/raise function. > > Impacts in terms of size are really limited
Please use busybox's incarnation of bloat-o-meter to report size changes in the future. Acked-by: Bernhard Reutner-Fischer <[email protected]> > > Current > text data bss dec hex filename > 164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os > 164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS > 220 24 4 248 f8 ./libc/stdlib/abort.os > > With (-fasynchronous-unwind-tables) > > text data bss dec hex filename > 216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os > 216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS > 280 24 4 308 134 ./libc/stdlib/abort.os > > Signed-off-by: Carmelo Amoroso <[email protected]> > --- > libc/signal/Makefile.in | 2 ++ > libc/stdlib/Makefile.in | 2 ++ > .../sysdeps/unix/sysv/linux/Makefile.commonarch | 2 ++ > 3 files changed, 6 insertions(+), 0 deletions(-) > > diff --git a/libc/signal/Makefile.in b/libc/signal/Makefile.in > index a7e3078..ed8598b 100644 > --- a/libc/signal/Makefile.in > +++ b/libc/signal/Makefile.in > @@ -24,6 +24,8 @@ ifneq ($(strip $(ARCH_OBJS)),) > CSRC-y := $(filter-out $(notdir $(ARCH_OBJS:.o=.c)),$(CSRC-y)) > endif > > +CFLAGS-raise.c = -fasynchronous-unwind-tables > + > SIGNAL_DIR := $(top_srcdir)libc/signal > SIGNAL_OUT := $(top_builddir)libc/signal > > diff --git a/libc/stdlib/Makefile.in b/libc/stdlib/Makefile.in > index 73e5462..9e96f03 100644 > --- a/libc/stdlib/Makefile.in > +++ b/libc/stdlib/Makefile.in > @@ -27,6 +27,8 @@ CSRC-$(if $(findstring yy,$(UCLIBC_HAS_FLOATS)$(UCLIBC_SUSV3_LEGACY)),y) += \ > gcvt.c > CSRC-$(UCLIBC_SUSV3_LEGACY) += mktemp.c > > +CFLAGS-abort.c = -fasynchronous-unwind-tables > + > # multi source stdlib.c > CSRC-y += abs.c labs.c atoi.c atol.c strtol.c strtoul.c _stdlib_strto_l.c \ > qsort.c qsort_r.c bsearch.c \ > diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch > index e28cec2..b32bc9b 100644 > --- a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch > +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch > @@ -128,6 +128,8 @@ CFLAGS-timer_gettime.c = -I$(top_srcdir)librt -DIS_IN_librt > CFLAGS-timer_routines.c = -I$(top_srcdir)librt -DIS_IN_librt > CFLAGS-timer_settime.c = -I$(top_srcdir)librt -DIS_IN_librt > > +CFLAGS-raise.c = -fasynchronous-unwind-tables > + > CFLAGS-linux = -DNOT_IN_libc -DIS_IN_libpthread $(SSP_ALL_CFLAGS) > > CFLAGS-OMIT-libc_pthread_init.c = -DNOT_IN_libc -DIS_IN_libpthread > -- > 1.7.4.4 > > _______________________________________________ > uClibc mailing list > [email protected] > http://lists.busybox.net/mailman/listinfo/uclibc _______________________________________________ uClibc mailing list [email protected] http://lists.busybox.net/mailman/listinfo/uclibc
