[OE-core] [PATCH] world-broken: Add libunwind for musl/arm

[Khem Raj]

gcc and libunwind race and when libunwind wins
results are build fails for gcc as described
this is only seen on musl/arm since on musl
/usr/include is search before gcc fixed headers
and unwind.h is in fixed headers. So it works
ok on glibc but not on musl due to reversed search
order.

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 meta/conf/distro/include/world-broken.inc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/meta/conf/distro/include/world-broken.inc b/meta/conf/distro/include/world-broken.inc
index a5f6371..d4bdddf 100644
--- a/meta/conf/distro/include/world-broken.inc
+++ b/meta/conf/distro/include/world-broken.inc
@@ -47,3 +47,10 @@ EXCLUDE_FROM_WORLD_pn-perf_libc-musl = "1"
 
 # error: 'RTLD_NEXT' was not declared in this scope
 EXCLUDE_FROM_WORLD_pn-gcc-sanitizers_libc-musl = "1"
+
+# gcc fails to build when libuwind is staged before building gcc since
+# it then finds the unwind.h header from libunwind and not from libgcc
+# and on arm specially they are different since libgcc defines some functions
+# as macros which are functions in libunwind and it fails during linking
+# libbacktrace/backtrace.c:76: undefined reference to `_Unwind_GetIP'
+EXCLUDE_FROM_WORLD_pn-libunwind_libc-musl_arm = "1"
-- 
2.9.2