libubacktrace: Provide uClibc with backtrace functions

A new shared object, libubacktrace.so.0 is added to uClibc
to provide backtrace functions to support application self-debugging.
This set of functions requires to dynamically load libgcc_s.so so they
need to call dlopen/dlsym that are provided by libdl. For this reason
they cannot be included into libc.so.0 but are provided by a new library.

User application that wants to use backtrace needs to be compiled with
-fexceptions option and -rdynamic to get full symbols printed and must be
linked against libubacktrace.so

Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/Makerules b/Makerules
index cb1c554bc..2e9ca05bf 100644
--- a/Makerules
+++ b/Makerules
@@ -32,12 +32,12 @@ shared_objs = $(libc-y:.o=.os) $(libc-shared-y) $(libc-nonshared-y) \
 	$(libpthread-so-y) $(libpthread-nonshared-y) $(libthread_db-so-y) \
 	$(libresolv-so-y) $(librt-so-y) \
 	$(ldso-y) \
-	$(libutil-so-y)
+	$(libutil-so-y) $(libubacktrace-so-y)
 
 ar_objs =  $(libc-y) $(libc-static-y) $(libcrypt-a-y) \
 	$(libdl-a-y) $(libintl-a-y) $(libm-a-y) $(libnsl-a-y) \
 	$(libpthread-a-y) $(libthread_db-a-y) \
-	$(libresolv-a-y) $(librt-a-y) $(libutil-a-y)
+	$(libresolv-a-y) $(librt-a-y) $(libutil-a-y) $(libubacktrace-a-y)
 ifeq ($(DOPIC),y)
 ar_objs := $(ar_objs:.o=.os)
 endif
@@ -455,7 +455,8 @@ files.dep := $(libc-a-y) $(libc-so-y) $(libc-nonshared-y) \
 	$(libthread_db-a-y) $(libthread_db-so-y) $(libpthread-generated-y) \
 	$(librt-a-y) $(librt-so-y)  $(libresolv-a-y) $(libresolv-so-y) \
 	$(libcrypt-a-y) $(libcrypt-so-y) $(libutil-a-y) $(libutil-so-y) \
-	$(libnsl-a-y) $(libnsl-so-y) $(ldso-y) $(libdl-a-y) $(libdl-so-y)
+	$(libnsl-a-y) $(libnsl-so-y) $(ldso-y) $(libdl-a-y) $(libdl-so-y) \
+	$(libubacktrace-a-y) $(libubacktrace-so-y)
 .depends.dep := \
 	$(patsubst %.s,%.s.dep,$(filter %.s,$(files.dep))) \
 	$(patsubst %.o,%.o.dep,$(filter %.o,$(files.dep))) \