798711cade
The xcrun script should be skipping the ENV directory when it scans $PATH looking for tools to run. Unfortunately, the script compares the paths found to the real path of the ENV directory (following symlinks), but superenv was adding the nominal path to $PATH, not following symlinks. As a consequence, platforms with Xcode < 4.3 would get into infinite loops when trying to call non-system versions of gcc, as xcrun calls the ENV version of gcc-X.X which calls xcrun and so on forever. This commit changes superenv to follow symlinks when determining the bin path to use. Fixes Homebrew/homebrew#33731. Closes Homebrew/homebrew#40062. Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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