disable C++ for alpha, static build seems problematic

target/config/Config.in.toolchain

@@ -55,7 +55,8 @@ endchoice
 menu "Compiler language support"
 config ADK_TOOLCHAIN_WITH_CXX
 	bool "enable C++"
-	default y if ADK_TARGET_OS_LINUX && !ADK_TARGET_ARCH_H8300
+	default y if ADK_TARGET_OS_LINUX \
+		&& !(ADK_TARGET_ARCH_H8300 || ADK_TARGET_ARCH_ALPHA)
 	default n
 
 config ADK_TOOLCHAIN_WITH_OBJC