[Rd] R package compilation: files in src directory should be ignored if C library is not available

[Cule, Erika]

Ah I see! Had not thought of that solution.

(This is the first time I have tried to use autoconf and configure)

Many thanks.

Erika

On 17 Aug 2012, at 13:04, Dirk Eddelbuettel wrote:

> 
> On 17 August 2012 at 11:44, Cule, Erika wrote:
> | If so, I still don't understand what happens when I compile the package if GSL is not installed on the computer, as there will still be C code in the src directory.
> 
> That is precisely the use case for autoconf et al.
> 
> You test if something (here GSL) is available (and there are macros and
> examples for in many places) and then define a header file variable such as
> I_HAVE_FOUND_GSL as 1 or 0, say.  In your C code, you then use something like
> 
>   #if I_HAVE_FOUND_GSL == 1
> 
>       some code
> 
>   #endif 
> 
> Now your code compiles in both cases.
> 
> Alternatively, you just depend on the GSL. Many packages on CRAN do, and the
> Windows build infrastructure provides it.
> 
> Dirk
> 
> -- 
> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com