[Rd] Detecting compilation under R
b.rowlingson at lancaster.ac.uk
Thu Dec 14 16:14:45 CET 2006
The docs tell me:
"The header files define USING_R, which should be used to test if the
code is indeed being used with R."
but surely you only get that if you #include <R.h>, which you can only
do if you are using R. If you have code that you might want to compile
in R and for other purposes, how can you detect this?
As an example, suppose I have some C that uses GSL to get a random
number if its a standalone program, or uses R's internals if its being
compiled to run in R. I want to do something like:
x = rand_unif(0.0,1.0);
x = gsl_runif(0.0,1.0);
(cant remember the exact names but hopefully you get the idea). This
fails because USING_R is only set when R.h is included.
Are there any preprocessor definitions set by R CMD SHLIB and R CMD
BUILD that I can test against?
Of course I can stick PKG_CFLAGS=-DYES_THIS_IS_USING_R in Makevars,
but I just wondered if there was a default solution I'd missed. Or if it
was a good idea anyway.
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