Compiler warning: function returns address of local variable

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I am a Gentoo user. I have just upgraded my Gentoo system,
as I usually do every Saturday. During this process, my previous
dev-lang/R-2.10.1 ebuild package has been upgraded to R-3.0.1.
While compiling it, I have got the following compiler warning:

  * QA Notice: Package triggers severe warnings which indicate that it
  *            may exhibit random runtime failures.
  * main.c:1548:5: warning: function returns address of local variable
[enabled by default]

  * Please do not file a Gentoo bug and instead report the above QA
  * issues directly to the upstream developers of this software.
  * Homepage: http://www.r-project.org/

The Bug Tracking page of www.r-project.org simply do not open.
It was down for a few days whilst the hardware was moved to another 
site.  It is up now at https://rbugs.urbanek.info/bugzilla3/, and 
hopefully will be available again as bugs.r-project.org today.
So, I've just subscribed to this mailing list to post this compiler
warning here.

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That is the whole point of that piece of C code, so please do report the 
Gentoo bug (their message is simply bogus) to them.

And also read posting guide before posting: HTML mail is not allowed here.
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