Jarrod,

could you point us to the code? There is not much to go by based on your email. 
One thing just in general: it's always safer to not re-map function names, 
especially since "error" can be defined in many random other headers, so it's 
better to use Rf_error() instead to avoid confusions with 3rd party headers 
that may (re-)define the "error" macro (depending on the order you include them 
in).

Cheers,
Simon


> On 4/05/2024, at 3:17 AM, Jarrod Hadfield <j.hadfi...@ed.ac.uk> wrote:
> 
> Hi,
> 
> I have an R library with C code in it. It has failed the CRAN checks for 
> Debian.  The problem is with the error function being undefined. Section 6.2 
> of the Writing R extensions (see below) suggests error handling can be 
> handled by error and the appropriate header file is included in R.h, but this 
> seems not to be the case?
> 
> Any help would be appreciated!
> 
> Thanks,
> 
> Jarrod
> 
> 6.2 Error signaling
> 
> The basic error signaling routines are the equivalents of stop and warning in 
> R code, and use the same interface.
> 
> void error(const char * format, ...);
> void warning(const char * format, ...);
> void errorcall(SEXP call, const char * format, ...);
> void warningcall(SEXP call, const char * format, ...);
> void warningcall_immediate(SEXP call, const char * format, ...);
> 
> These have the same call sequences as calls to printf, but in the simplest 
> case can be called with a single character string argument giving the error 
> message. (Don�t do this if the string contains �%� or might otherwise be 
> interpreted as a format.)
> 
> These are defined in header R_ext/Error.h included by R.h.
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