$ ./prebuilt/toolchain/armv7a/bin/armv7a-cros-linux-gnueabi-clang                                                                                                                                                                                                        [15:10 0]
Traceback (most recent call last):
  File "/usr/local/google/home/bcf/src/master1/prebuilt/toolchain/armv7a/bin/../usr/x86_64-pc-linux-gnu/armv7a-cros-linux-gnueabi/gcc-bin/4.9.x/armv7a-cros-linux-gnueabi-clang", line 341, in <module>
    clang_cmdline += ['-B' + linker_path]
TypeError: cannot concatenate 'str' and 'NoneType' objects

In order to use armv7a-cros-linux-gnueabi-clang, it's directory must be in the $PATH and $CLANG must be set to armv7a/usr/bin/clang

armv7a-cros-linux-gnueabi-gcc can be run without these being set.

Can clang be changed to use these default values?