define STRICT_R_HEADERS to avoid definition of Free, ... #898
Description
When this macro is not defined, R headers do define macros with very generic names, such as Free for S-PLUS back compatibility:
https://github.com/wch/r-source/blob/trunk/src/include/R_ext/RS.h#L70
#ifndef STRICT_R_HEADERS
/* S-PLUS 3.x but not 5.x NULLs the pointer in the following */
#define Calloc(n, t) (t *) R_chk_calloc( (R_SIZE_T) (n), sizeof(t) )
#define Realloc(p,n,t) (t *) R_chk_realloc( (void *)(p), (R_SIZE_T)((n) * sizeof(t)) )
#define Free(p) (R_chk_free( (void *)(p) ), (p) = NULL)
#endifhttps://github.com/wch/r-source/blob/trunk/src/include/R_ext/RS.h#L49
#ifndef STRICT_R_HEADERS
#define R_PROBLEM_BUFSIZE 4096
/* Parentheses added for FC4 with gcc4 and -D_FORTIFY_SOURCE=2 */
#define PROBLEM {char R_problem_buf[R_PROBLEM_BUFSIZE];(sprintf)(R_problem_buf,
#define MESSAGE {char R_problem_buf[R_PROBLEM_BUFSIZE];(sprintf)(R_problem_buf,
#define ERROR ),error(R_problem_buf);}
#define RECOVER(x) ),error(R_problem_buf);}
#define WARNING(x) ),warning(R_problem_buf);}
#define LOCAL_EVALUATOR /**/
#define NULL_ENTRY /**/
#define WARN WARNING(NULL)
#endifAnd https://github.com/wch/r-source/blob/trunk/src/include/R_ext/Constants.h#L35
#ifndef STRICT_R_HEADERS
#define PI M_PI
#include <float.h> /* Defines the rest, at least in C99 */
#define SINGLE_EPS FLT_EPSILON
#define SINGLE_BASE FLT_RADIX
#define SINGLE_XMIN FLT_MIN
#define SINGLE_XMAX FLT_MAX
#define DOUBLE_DIGITS DBL_MANT_DIG
#define DOUBLE_EPS DBL_EPSILON
#define DOUBLE_XMAX DBL_MAX
#define DOUBLE_XMIN DBL_MIN
#endifFor example the Free macro was making noise in arrow: romainfrancois/arrow@79c5001#diff-65a2f88d0196bb912b5ba669f5792492R20
So, should Rcpp have define STRICT_R_HEADERS somewhere ?