nativesdk-clang: Fix build when using RUNTIME = llvm

We can not use nativesdk variants of libcxx and compiler-rt yet when
compiling nativesdk-clang because, it will need this compiler to build
them, so solve this catch-22, since we do not use the runtime built
during compiler builds, use libgcc/libstdc++ to pass cmake tests
during configure, this should be fine as it will be not needed for final
builds where nativesdk-clang will be used, it can still default to llvm
runtime on SDK host

Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/recipes-devtools/clang/clang_git.bb b/recipes-devtools/clang/clang_git.bb
index d0f7c48..fcb9885 100644
--- a/recipes-devtools/clang/clang_git.bb
+++ b/recipes-devtools/clang/clang_git.bb
@@ -305,6 +305,8 @@ SSTATE_SCAN_FILES:remove = "*-config"
 TOOLCHAIN = "clang"
 TOOLCHAIN:class-native = "gcc"
 TOOLCHAIN:class-nativesdk = "clang"
+COMPILER_RT:class-nativesdk:toolchain-clang:runtime-llvm = "-rtlib=libgcc --unwindlib=libgcc"
+LIBCPLUSPLUS:class-nativesdk:toolchain-clang:runtime-llvm = "-stdlib=libstdc++"
 
 SYSROOT_DIRS:append:class-target = " ${nonarch_libdir}"