[Rd] R CMD SHLIB
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed May 17 18:49:49 CEST 2006
On Wed, 17 May 2006, Bill Dunlap wrote:
> On Wed, 17 May 2006, Martin Maechler wrote:
>>>>>>> "TL" == Thomas Lumley <tlumley at u.washington.edu>
>>>>>>> on Tue, 16 May 2006 10:15:11 -0700 (PDT) writes:
>> TL> On Tue, 16 May 2006, Prof Brian Ripley wrote:
>> >> It is possible to do things like
>> >> env PKG_LIB="-L/opt/foo/lib -lbar" R CMD SHLIB *.c
>> >> to add libraries to the creation of a shared object, but
>> >> I have from time to time wondered if we should allow
>> >> R CMD SHLIB *.c -L/opt/foo/lib -lbar
>> >> not least as users seems to expect it to work. It looks
>> >> simple to do (at least under Unix) if we pass -L* -l* *.a
>> >> directly to the link command.
>> >> Would this be worthwhile?
>> TL> Yes.
>> TL> My only reservation is that users may then expect all
>> TL> compiler/linker flags to work, not just -L/-l
>> I had exactly the same thought.
>> Maybe Brian's proposal can be extended into
>> "all switches that are not recognized by 'R CMD SHLIB' are
>> passed to compiler / linker ...."
>> hmm, or maybe not, since the question quickly become *which* are
>> passed to compiler and which to linker (and which to both ?) ...
> I'd rather have SHLIB complain if it sees a -flag
> that SHLIB doesn't recognize. Otherwise we get
> portability problems. E.g., when using the Microsoft
> C compiler and linker a SHLIB that knows about the
> -l and -L flags can translate
> -lfoo -L/dir/subdir
> into LDFLAGS that link.exe knows about:
> foo.lib /libpath:\dir\subdir
> If you need other linker flags, could they be in compiler/platform-
> specific Makevars-<compiler/platform>? I think other
> ones are not very common.
In R, we are not dealing with such compilers/linkers (fortunately). Given
that there are plenty of ways to hang oneself here, I do not want to be
unduly restrictive as to what one can pass. (All the autoconf etc
mechanisms assume flags like -L and -l, and also that some reordering is
done by the frontends.)
> Bill Dunlap
> Insightful Corporation
> bill at insightful dot com
> "All statements in this message represent the opinions of the author and do
> not necessarily reflect Insightful Corporation policy or position."
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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