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cmd/dist: depends on clang license being accepted on OSX #13099

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cookieo9 opened this issue Oct 29, 2015 · 8 comments
Closed

cmd/dist: depends on clang license being accepted on OSX #13099

cookieo9 opened this issue Oct 29, 2015 · 8 comments
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Go1.6

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@cookieo9
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In a recent update to either the OS or the dev-tools clang on OSX will refuse to run (with error code 69) until it is run as root, and the license is accepted.

The output from ./all.bash when compiling from source is:

go tool dist: cannot invoke C compiler "clang": exit status 69

Go needs a system C compiler for use with cgo.
To set a C compiler, export CC=the-compiler.
To disable cgo, export CGO_ENABLED=0.

Which is a little of a head scratcher. I think the error message could elaborate on a possible cause, so that the users don't think the only solution is to disable cgo.
@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Oct 30, 2015
@ianlancetaylor
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It seems kind of special purpose to have cmd/dist print out a specific message about this oddity. What does clang print if you run it as non-root before root? Would it be sufficient for cmd/dist to display that output?

@cookieo9
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It prints out a message to the effect that clang needs to be run as root to accept the license (I've lost the output, so I can't give exact details.) I was just thinking that it would make sense for the build process to make it clear what the problem was. Either by outputting clang's output, or by printing a message when darwin's clang fails with a certain error code.

@rakyll
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rakyll commented Oct 30, 2015

It prints out

Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo.

As an experienced user, I knew what I had to do. But it is confusing for anyone who doesn't know they need to run clang, accept the license and so on.

@rakyll
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rakyll commented Oct 30, 2015

/cc @crawshaw @hyangah

This error message is also visible from gomobile build's output without any useful context.

gomobile  build  -target=android .
gomobile: xcrun --find: exit status 69


Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo.

@rsc
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rsc commented Nov 5, 2015

It's wacky but I think we probably do need to special case it. OS X is a very common platform for our users, and this is a very common situation. Printing the compiler output is not enough unless we make it very clear that it's compiler output and that the user is not being asked to sudo ./all.bash (which would work but isn't what we want).

@bradfitz
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bradfitz commented Dec 2, 2015

On a fresh Capitan (10.11.1 (15B42)) install, I see:

ward5k:~ bradfitz$ git
xcode-select: note: no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.
ward5k:~ bradfitz$ echo $?
1
ward5k:~ bradfitz$ clang
xcode-select: note: no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.
ward5k:~ bradfitz$ echo $?
1

@rsc
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rsc commented Dec 17, 2015

@bradfitz That must be before you installed Xcode. After you install Xcode then you get the message about re-running as root.

@gopherbot
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CL https://golang.org/cl/17940 mentions this issue.

@rsc rsc closed this as completed in 4378746 Dec 17, 2015
@golang golang locked and limited conversation to collaborators Dec 29, 2016
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@bradfitz @rsc @rakyll @cookieo9 @ianlancetaylor @gopherbot