[master][morty][PATCH v2] glibc: Enable backtrace from abort on ARM

[Mark Hatle <mark.hatle@windriver.com>]

From: Yuanjie Huang <yuanjie.huang@windriver.com>

ARM stack frames for abort and raise were limited to the the actual
abort and raise call, such as:

Obtained 4 stack frames.
./test-app(print_trace+0x1c) [0x10a08]
./test-app() [0x10b3c]
/lib/libc.so.6(__default_sa_restorer+0) [0x4adae1e0]
/lib/libc.so.6(gsignal+0xa0) [0x4adacf74]

This is not terribly useful when trying to figure out what function
may have called called the abort, especially when using pthreads.

After the change the trace would now look like:

Obtained 8 stack frames.
./test-app(print_trace+0x1c) [0x10a08]
./test-app() [0x10b3c]
/lib/libc.so.6(__default_sa_restorer+0) [0x4befe1e0]
/lib/libc.so.6(gsignal+0xa0) [0x4befcf74]
/lib/libc.so.6(abort+0x134) [0x4befe358]
./test-app(dummy_function+0x50) [0x10adc]
./test-app(main+0xd4) [0x10c24]
/lib/libc.so.6(__libc_start_main+0x114) [0x4bee7a58]

Signed-off-by: Yuanjie Huang <yuanjie.huang@windriver.com>
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
---
 meta/recipes-core/glibc/glibc.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/recipes-core/glibc/glibc.inc b/meta/recipes-core/glibc/glibc.inc
index e85c7044a0..7bae0e9554 100644
--- a/meta/recipes-core/glibc/glibc.inc
+++ b/meta/recipes-core/glibc/glibc.inc
@@ -78,3 +78,9 @@ do_configure_prepend() {
 }
 
 GLIBC_ADDONS ?= "nptl,libidn"
+
+# Enable backtrace from abort()
+do_configure_append_arm () {
+	echo "CFLAGS-abort.c = -fasynchronous-unwind-tables" >> ${B}/configparms
+	echo "CFLAGS-raise.c = -fasynchronous-unwind-tables" >> ${B}/configparms
+}
-- 
2.11.0.rc1