clang: Default to compiler-rt/libcxx/libunwind when RUNTIME = "llvm"

This ensures that compiler defaults are defaulting to llvm provided
c/c++ runtimes which includes c-runtime, c++runtime, unwinder and omp
runtime, current approach is to inject commandline options but it does
not get passed in all cases and a lot of smaller/big patches are used to
make such package recipes behave

If RUNTIME = "gnu" then defaults stay to use gcc runtime as it is

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

recipes-devtools/clang/clang_git.bb

@@ -52,14 +52,16 @@ def get_clang_experimental_target_arch(bb, d):
 
 PACKAGECONFIG ??= "compiler-rt libcplusplus shared-libs lldb-wchar \
                    ${@bb.utils.filter('DISTRO_FEATURES', 'thin-lto lto', d)} \
+                   ${@bb.utils.contains('RUNTIME', 'llvm', 'compiler-rt libcplusplus unwindlib libomp', '', d)} \
                    rtti eh libedit terminfo \
                    "
-PACKAGECONFIG_class-native = "rtti eh libedit shared-libs"
-PACKAGECONFIG_class-nativesdk = "rtti eh libedit shared-libs ${@bb.utils.filter('DISTRO_FEATURES', 'thin-lto lto', d)}"
+PACKAGECONFIG_class-native = "rtti eh libedit shared-libs ${@bb.utils.contains('RUNTIME', 'llvm', 'compiler-rt libcplusplus unwindlib libomp', '', d)}"
+PACKAGECONFIG_class-nativesdk = "rtti eh libedit shared-libs ${@bb.utils.filter('DISTRO_FEATURES', 'thin-lto lto', d)} ${@bb.utils.contains('RUNTIME', 'llvm', 'compiler-rt libcplusplus unwindlib libomp', '', d)}"
 
-PACKAGECONFIG[compiler-rt] = "-DCLANG_DEFAULT_RTLIB=compiler-rt,,libcxx,compiler-rt"
-PACKAGECONFIG[libcplusplus] = "-DCLANG_DEFAULT_CXX_STDLIB=libc++,,libcxx"
-PACKAGECONFIG[unwindlib] = "-DCLANG_DEFAULT_UNWINDLIB=libunwind,-DCLANG_DEFAULT_UNWINDLIB=libgcc,libcxx"
+PACKAGECONFIG[compiler-rt] = "-DCLANG_DEFAULT_RTLIB=compiler-rt,,"
+PACKAGECONFIG[libcplusplus] = "-DCLANG_DEFAULT_CXX_STDLIB=libc++,,"
+PACKAGECONFIG[unwindlib] = "-DCLANG_DEFAULT_UNWINDLIB=libunwind,-DCLANG_DEFAULT_UNWINDLIB=libgcc,,"
+PACKAGECONFIG[libomp] = "-DCLANG_DEFAULT_OPENMP_RUNTIME=libomp,,"
 PACKAGECONFIG[thin-lto] = "-DLLVM_ENABLE_LTO=Thin -DLLVM_BINUTILS_INCDIR=${STAGING_INCDIR},,binutils,"
 PACKAGECONFIG[lto] = "-DLLVM_ENABLE_LTO=Full -DLLVM_BINUTILS_INCDIR=${STAGING_INCDIR},,binutils,"
 PACKAGECONFIG[shared-libs] = "-DLLVM_BUILD_LLVM_DYLIB=ON -DLLVM_LINK_LLVM_DYLIB=ON,,,"
@@ -88,6 +90,8 @@ LLVM_TARGETS_TO_BUILD;LLVM_EXPERIMENTAL_TARGETS_TO_BUILD;PYTHON_EXECUTABLE;\
 PYTHON_LIBRARY;PYTHON_INCLUDE_DIR;LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN;LLDB_EDITLINE_USE_WCHAR;\
 LLVM_ENABLE_LIBEDIT;LLDB_ENABLE_LIBEDIT;LLDB_PYTHON_RELATIVE_PATH;\
 CMAKE_C_FLAGS_RELEASE;CMAKE_CXX_FLAGS_RELEASE;CMAKE_ASM_FLAGS_RELEASE;\
+CLANG_DEFAULT_CXX_STDLIB;CLANG_DEFAULT_RTLIB;CLANG_DEFAULT_UNWINDLIB;\
+CLANG_DEFAULT_OPENMP_RUNTIME;\
 "
 #
 # Default to build all OE-Core supported target arches (user overridable).