[R] choosing g/g++ compiler executable in R CMD SHLIB

[Kurt Hornik]

>>>>> Prof Brian D Ripley writes:

> On Sat, 17 Nov 2001, Faheem Mitha wrote:

>> Just one more question. Is it possible to override ../etc/Makeconf
>> locally, in the directory in which I am doing the complilation? I can use
>> Makevars to set flags, but it doesn't seem to work with choosing the
>> compiler. Ie setting CC=.. in Makevars has no effect.

> I believe that is intentional.  Neither setting CC in the environment nor
> in Makevars works for me.  Makevars precedes the standard makefile.
> I did make setting CC in the environment work by setting MAKE to `gmake
> -e', as in (under tcsh)

> auk% env MAKE='gmake -e' CC=cc R CMD SHLIB test.c

This is actually an FAQ:

How can I change compilation flags?
===================================

   Suppose you have C code file for dynloading into R, but you want to
use `R CMD SHLIB' with compilation flags other than the default ones
(which were determined when R was built).  You could change the file
``R_HOME'/etc/Makeconf' to reflect your preferences.  If you are a
Bourne shell user, you can also pass the desired flags to Make (which
is used for controlling compilation) via the Make variable `MAKEFLAGS',
as in

     MAKEFLAGS="CFLAGS=-O3" R CMD SHLIB *.c

-k
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