llvm dev - Feb 2012 - [LLVMdev] Build fails when in a path containing spaces

I've run into what appears to be an odd bug with the autoconf-based build
when run in a path containing spaces:

    LLVM_SRC_ROOT   := $(call realpath, /path/with some/spaces)

in Makefile.config returns empty string, while:

    LLVM_SRC_ROOT   := $(call realpath, /path/without/spaces)

returns the expected "/path/without/spaces".

This breaks the build from the very start.

(This is on Ubuntu 11.10.)
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Jonathan,

See also; http://llvm.org/bugs/show_bug.cgi?id=10979

We assume build dir must be sane.

It would be a bug, if generated toolchain (clang, llc, opt &c) did not
accept whitespace paths.

...Takumi