Merge branch 'fix-clang-cross-compile-find-binutils' into release

Modules/CMakeDetermineCCompiler.cmake

@@ -136,7 +136,9 @@ if (CMAKE_CROSSCOMPILING  AND NOT _CMAKE_TOOLCHAIN_PREFIX)
     if (COMPILER_BASENAME MATCHES "^(.+-)(clang|g?cc)(-[0-9]+\\.[0-9]+\\.[0-9]+)?(\\.exe)?$")
       set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
     elseif("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
-      set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_C_COMPILER_TARGET}-)
+      if(CMAKE_C_COMPILER_TARGET)
+        set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_C_COMPILER_TARGET}-)
+      endif()
     elseif(COMPILER_BASENAME MATCHES "qcc(\\.exe)?$")
       if(CMAKE_C_COMPILER_TARGET MATCHES "gcc_nto([^_le]+)(le)?.*$")
         set(_CMAKE_TOOLCHAIN_PREFIX nto${CMAKE_MATCH_1}-)

Modules/CMakeDetermineCXXCompiler.cmake

@@ -133,7 +133,9 @@ if (CMAKE_CROSSCOMPILING  AND NOT  _CMAKE_TOOLCHAIN_PREFIX)
     if (COMPILER_BASENAME MATCHES "^(.+-)(clan)?[gc]\\+\\+(-[0-9]+\\.[0-9]+\\.[0-9]+)?(\\.exe)?$")
       set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
     elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-      set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_CXX_COMPILER_TARGET}-)
+      if(CMAKE_CXX_COMPILER_TARGET)
+        set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_CXX_COMPILER_TARGET}-)
+      endif()
     elseif(COMPILER_BASENAME MATCHES "QCC(\\.exe)?$")
       if(CMAKE_CXX_COMPILER_TARGET MATCHES "gcc_nto([^_le]+)(le)?.*$")
         set(_CMAKE_TOOLCHAIN_PREFIX nto${CMAKE_MATCH_1}-)