[R] trouble using R Mathlib as standalone

[Prof Brian Ripley]

On Mon, 14 Jan 2002, Dirk Eddelbuettel wrote:

>
>   "Faheem" == Faheem Mitha <faheem at email.unc.edu> writes:
>   Faheem>  OK, but what is the best way of making the warning go away? I
>   Faheem> would like to keep -pedantic. Shall I comment out the declation of
>
> Dunno. I never use more than -Wall which, from my experience, catches
> everything that is reasonable.

-pedantic can be very helpful in catching non-ISO-C code.  Quite often
people have code that compiles on their system (usually gcc) but not on a
C-only compiler.  The use of C++ comments is the most common, but we've
met others.   So it's been helpful in achieving portability of R and
contributed packages.

One nuisance is that -pedantic warns about use of legal features of C99,
including in the R sources (where they are inside #ifdef blocks).

>   Faheem> log1p in Rmath.h Line 520)?  Is that harmless? In any case, I think
>   Faheem> this qualifies as a minor bug.
>
> Disagree. Remember that you are not getting an error, all you are getting is
> a warning message. Maybe a nuisance, but not a bug.

I think we need to consider renaming the R version of log1p to avoid
possible problems elsewhere.  It is not a bug, as it does need to be
declared in Rmath.h on some ISO C systems.  It just happens that both
glibc and MM used the same name for the same extension.

-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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