[ClangConfig] Follow LLVM's example and only install...

[ClangConfig] Follow LLVM's example and only install Clang{Config,Target}.cmake when LLVM_INSTALL_TOOLCHAIN_ONLY is disabled.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274177 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/CMakeLists.txt

@@ -19,8 +19,10 @@ configure_file(
   ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/ClangConfig.cmake
   @ONLY)
 
-install(EXPORT ClangTargets DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
+if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+  install(EXPORT ClangTargets DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
 
-install(FILES
-  ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/ClangConfig.cmake
-  DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
+  install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/ClangConfig.cmake
+    DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
+endif()