[PATCH] tcmode-default.inc: clear PREFERRED_VERSION for llvm

[<kai.kang@windriver.com>]

From: Kai Kang <kai.kang@windriver.com>

When include layer meta-clang which set LLVMVERSION in layer.conf, it
shows warnings:

| WARNING: preferred version 13.0.1 of llvm-native not available (for item llvm-native)
| WARNING: versions of llvm-native available: 12.0.1
| WARNING: preferred version 13.0.1 of llvm not available (for item llvm)
| WARNING: versions of llvm available: 12.0.1
| WARNING: preferred version 13.0.1 of llvm not available (for item llvm-dev)
| WARNING: versions of llvm available: 12.0.1
| WARNING: preferred version 13.0.1 of llvm not available (for item llvm-bugpointpasses)
| WARNING: versions of llvm available: 12.0.1
| WARNING: preferred version 13.0.1 of llvm not available (for item llvm-liboptremarks)
| WARNING: versions of llvm available: 12.0.1
| WARNING: preferred version 13.0.1 of llvm not available (for item llvm-llvmhello)
| WARNING: versions of llvm available: 12.0.1

Because only one version llvm exists, remove the PREFERRED_VERSION
setting for llvm.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
 meta/conf/distro/include/tcmode-default.inc | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/meta/conf/distro/include/tcmode-default.inc b/meta/conf/distro/include/tcmode-default.inc
index 49e99af8f2..2622b055a2 100644
--- a/meta/conf/distro/include/tcmode-default.inc
+++ b/meta/conf/distro/include/tcmode-default.inc
@@ -79,10 +79,6 @@ PREFERRED_VERSION_go-runtime ?= "${GOVERSION}"
 PREFERRED_VERSION_nativesdk-go ?= "${GOVERSION}"
 PREFERRED_VERSION_nativesdk-go-runtime ?= "${GOVERSION}"
 
-PREFERRED_VERSION_llvm = "${LLVMVERSION}"
-PREFERRED_VERSION_llvm-native = "${LLVMVERSION}"
-PREFERRED_VERSION_nativesdk-llvm = "${LLVMVERSION}"
-
 # Rust toolchain preferred versions:
 
 PREFERRED_VERSION_cargo ?= "${RUSTVERSION}"
-- 
2.17.1