[R-SIG-Mac] Xcode 5
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Oct 2 10:24:22 CEST 2013
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
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