[LLVMdev] Build fails when in a path containing spaces

[Jonathan Ragan-Kelley]

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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