Use libgcc instead of compiler-rt on klibc apps

klibc does not provide libssp functions e.g. __stack_chk_guard and
__stack_chk_guard which it expects from libc and compiler-rt code tend
to use these functions, so when using compiler-rt it ends up with
undefined symbols e.g.

/usr/lib/clang/13.0.0/lib/linux/libclang_rt.builtins-armhf.a(divmoddi4.c.o): in function `__divmoddi4':
divmoddi4.c:(.text+0x70): undefined reference to `__stack_chk_fail'
arm-yoe-linux-gnueabi-ld.bfd: divmoddi4.c:(.text+0x74): undefined reference to `__stack_chk_guard'

Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit bc2b5e4b874968745fdcfbcea43e2eb8eafa592e)

1 files changed, 2 insertions, 0 deletions

diff --git a/classes/clang.bbclass b/classes/clang.bbclass
index 8c2e3b7..849049a 100644
--- a/classes/clang.bbclass
+++ b/classes/clang.bbclass
@@ -15,10 +15,12 @@ PACKAGE_DEBUG_SPLIT_STYLE_toolchain-clang = "debug-without-src"
 COMPILER_RT ??= ""
 COMPILER_RT_powerpc = "-rtlib=libgcc ${UNWINDLIB}"
 COMPILER_RT_armeb = "-rtlib=libgcc ${UNWINDLIB}"
+COMPILER_RT_libc-klibc = "-rtlib=libgcc ${UNWINDLIB}"
 
 UNWINDLIB ??= ""
 UNWINDLIB_powerpc = "--unwindlib=libgcc"
 UNWINDLIB_armeb = "--unwindlib=libgcc"
+UNWINDLIB_libc-klibc = "--unwindlib=libgcc"
 
 LIBCPLUSPLUS ??= ""