Brad King a1c032b994 bootstrap: Suppress CMAKE_OSX_SYSROOT if CFLAGS have -isysroot ...

In order to bootstrap on OS X with Xcode without the command line tools
one must add -isysroot to CFLAGS and CXXFLAGS.  In this case the flags
will make it into the configured CMake.  Set CMAKE_OSX_SYSROOT to empty
in the initial cache to prevent CMake from adding -isysroot again.

2012-09-21 10:06:00 -04:00

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