glibc: Enable backtrace from abort on ARM

From: Yuanjie Huang <[email protected]>

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]

---
 meta/recipes-core/glibc/glibc.inc | 6 ++++++
 1 file changed, 6 insertions(+)

index e85c7044a0..7bae0e9554 100644
@@ -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