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 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 <carmelo.amor...@st.com> --- 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 uClibc@uclibc.org http://lists.busybox.net/mailman/listinfo/uclibc