[R-SIG-Mac] Which command line tools for XCode 4.2.1

[Simon Urbanek]

On Apr 16, 2013, at 3:13 PM, cstrato wrote:

> Dear Simon,
> 
> On your developer site you mention:
> "We use Xcode 4.2 but Xcode 3.2 and higher should work as well. Note that you will need Command Line Tools component of Xcode on Mac OS X 10.7 or higher."
> 
> I am running OS X 10.7.5 and XCode 4.2.1 on my Mac, but have not downloaded the command line tools. My questions are:
> 
> - why do I need the command line tools?
> 

Because Xcode no longer installs compilers, linkers etc. in the system, so you won't be able to run them.


> - which version do I need to download from:
> https://developer.apple.com/downloads/index.action
> 
> There are e.g.
>  - Command Line Tools (OS X Lion) for Xcode - October 2012
>    (it is not mentioned which version of Xcode)
>  - Command Line Tools (OS X Lion) for Xcode - November 2012
>    (Xcode 4.3 is mentioned but it is nor clear if it works with 4.2.1)
>  - Command Line Tools (OS X Lion) for Xcode - April 2013
>    (Xcode 4.6.2 is mentioned but it is nor clear if it works with 4.2.1)
> 

It doesn't really matter (it may matter in the future, because Apple has announced that they'll be removing llvm-gcc from Xcode) - latest should be fine for now. The version is independent of your Xcode -- in fact if you download it by hand, you don't even need Xcode at all. 


>  (BTW, the Preferences for Xcode 4.2.1 do not list Command Line Tools in the Install window.)
> 

I'm not sure what you mean by "Install window", but as Roy said, you'll find it in the download section of the preferences.


> - do the Command Line Tools update clang/clang++?
> 

Yes


> The reason for my question is that in order to compile the C++ code in my package with clang I need at least version 3.1 since 3.0 results in an error.
> 

You'll need to tweak your local ~/.R/Makevars for that to work since CRAN's R uses llvm-gcc.

Cheers,
Simon