[R-SIG-Mac] Xcode 5

[Prof Brian Ripley]

On 26/09/2013 08:19, Prof Brian Ripley wrote:
> Xcode was released last week, although it did not show up as an update
> for me until this.  It may be available only for Mountain Lion: the
> command-line tools seems only to be.
>
> As expected, the compilers used for the CRAN binary build, llvm-gcc-4.2
> and llvm-g++-4.2, are not part of Xcode 5.  Less expected was that
> updating to Xcode 5 did not remove them, at least for me.

But 'gcc' and 'g++' _are_ included in Xcode 5, as a version of clang 
(rather than a GCC-based compiler).  That is rather confusing.

It does mean that packages with autoconf scripts which do not take care 
to set CC/CXX will run with the clang-based gcc/g++ and quite possibly 
get incorrect results.  (Since autoconf has always preferred gcc to cc.)

> All that is needed to build R or install packages is the 'Command-line
> tools for Xcode'  These can be downloaded from
> https://developer.apple.com/downloads/index.action (registering your
> Apple ID for that site is needed).   New users could download and install
>
> Command-line tools (OS X Mountain Lion) for Xcode (April 2013)
> Command-line tools (OS X Mountain Lion) for Xcode (September 2013)
>
> and install them in that order.
>
> We have been testing building R and packages with clang since R 3.0.0,
> and details of how to do so are in the 'R Installation and
> Administration Manual'.  Xcode 5 updates to
>
> tystie% clang --version
> Apple LLVM version 5.0 (clang-500.2.75) (based on LLVM 3.3svn)
>
> whatever '3.3svn' means (3.2svn meant 3.1+epsilon).
>
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595