Homebrew
Why Xcode Command Line Tools is necessary? Why Xcode or self-installed ones don't work? #5408
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For the same reason a phone won't work when you need a screwdriver. They're not the same and Homebrew depends on the CommandLine Tools. |
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When did Apple command line tools necessary and why? |
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GCC uses the macOS SDK. The Command Line Tools are installed in a fixed location so we can always find the SDK at Xcode app however can be installed anywhere on the system - it might be If you aren't using the latest macOS version, there's an additional reason: the Xcode app doesn't ship the macOS SDK for older macOS but the Command Line Tools does. |
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GCC uses the macOS SDK. The Command Line Tools are installed in a fixed location so we can always find the SDK at
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk.Xcode app however can be installed anywhere on the system - it might be
/Applications/Xcode.app, but not always. GCC doesn't have code that tries to search the system for SDK like Apple's Clang does, so the SDK at/Library/Developer/CommandLineToolsis the one used.If you aren't using the latest macOS version, there's an additional reason: the Xcode app doesn't ship the macOS SDK for older macOS but the Command Line Tools does.