13e14ef65a
Undoing parts of the hot fix 78b9e8548e771a59e382e6f13339664ec5498391. The only thing missing was to check for `system "/usr/bin/xcrun -find make 1>/dev/null 2>&1"` and then it's safe to call locate. This commit restores the original functionality but without the risk for recursion and improves the logic of `MacOS.locate`. See below. To important changes in this commit: - For Xcode _and_ CLT: don't add the SDK and leave things as before. So if `MacOS.clt_installed?`, then no `SDKROOT` and `-L` and `-I` directories are set in `ENV.macosxsdk`. - Improved the logic for `MacOS.locate` for Xcode-only situations by assuring that the xcode-select path is correct. This is done by checking that `bin/make` exists and is executable. Otherwise it was possible to set xcode-select to an empty dir. This check is done in `MacOS.sdk_path` too. We are now able to use Xcode wherever it is and can work even, if xcode-select is set to invalid values. (Remember some users don't have sudo access and that is needed to fix xcode-select). Some minor whitespace fixes. Minor backtick fix in doctor.rb's printout. Signed-off-by: Adam Vandenberg <flangy@gmail.com>
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