[cfe-commits] Use GCC_INSTALL_PREFIX to initialize SysRoot

[Sebastian Pop]

Thanks James and Rafael for your review and testing.

As I have grepped for GCC_INSTALL_PREFIX to see all the places that
I have to modify, I have missed the changes to CMakeLists.txt.
So I also have added a description for GCC_INSTALL_PREFIX.

As suggested by Rafael, I factored out the other uses of
OPT__sysroot_EQ into a call to Compilation::getSysRoot()

Please let me know if the patch can still be improved before commit.

Thanks again for your very good feedback!
Sebastian
--
Qualcomm Innovation Center, Inc is a member of Code Aurora Forum
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