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I searched around and there are numerous posts with different arguments for clang, but I have not seen one related to '-wall' Here is full stack:

clang: error: unknown argument: '-wall' [-Wunused-command-line-argument-hard-error-in-future] clang: note: this will be a hard error (cannot be downgraded to a warning) in the future Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1 ** BUILD FAILED ** The following build commands failed: ProcessPCH /var/folders/bt/x7t6pymn3vs_mykqfrpwhwgdgbmz8t/C/com.apple.DeveloperTools/5.1-5B130a/Xcode/5.1-5B130a/Xcode/SharedPrecompiledHeaders/MyAppName-Prefix-axoyogsqgxeawmhjfylnspfdgfkm/MyAppName-Prefix.pch.pch MyAppName/MyAppName-Prefix.pch normal armv7 objective-c com.apple.compilers.llvm.clang.1_0.compiler

I am running the latest Xcode Version 5.1 (5B130a) I haven't change anything in the codebase lately, but I believe Xcode updated couple of days ago. I don't experience this on other projects that I have.

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2 Answers 2

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I think that's a mistyped gcc argument. You probably want -Weverything instead. See http://clang.llvm.org/docs/UsersManual.html#options-to-control-error-and-warning-messages

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I don't think it's mistyped, as '-Wall' is mentioned in the link you provided: clang.llvm.org/docs/…
If clang does include it, then you need to use a capital W, not a lowercase w.
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It seems to be the problem with the new version of clang that is provided with Xcode 5.1 Temporary solution for me was to downgrade to Xcode 5.0.2

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