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More comments on SDK handling for >= Xcode 7

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Closes Homebrew/homebrew#50537.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>
This commit is contained in:
ilovezfs 2016-03-30 05:13:41 -07:00 committed by Xu Cheng
parent 7651757709
commit 3d3e874c68
1 changed files with 16 additions and 4 deletions
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20
Library/Homebrew/os/mac.rb
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@ -86,10 +86,22 @@ module OS
@active_developer_dir ||= Utils.popen_read("/usr/bin/xcode-select", "-print-path").strip
end
# Returns the requested SDK, if installed.
# If the requested SDK is not installed returns either:
# a) The newest SDK (if any SDKs are available), or
# b) nil
# If a specific SDK is requested
# a) The requested SDK is returned, if it's installed.
# b) If the requested SDK is not installed, the newest SDK (if any SDKs
# are available) is returned.
# c) If no SDKs are available, nil is returned.
# If no specific SDK is requested
# a) For Xcode >= 7, the latest SDK is returned even if the latest SDK is
# named after a newer OS version than the running OS. The
# MACOSX_DEPLOYMENT_TARGET must be set to the OS for which you're
# actually building (usually the running OS version).
# https://github.com/Homebrew/homebrew/pull/50355
# https://developer.apple.com/library/ios/documentation/DeveloperTools/Conceptual/WhatsNewXcode/Articles/Introduction.html#//apple_ref/doc/uid/TP40004626
# Section "About SDKs and Simulator"
# b) For Xcode < 7, proceed as if the SDK for the running OS version had
# specifically been requested according to the rules above.
def sdk(v = nil)
@locator ||= SDKLocator.new
begin