[Rd] silent extern error (PR#898)

[bellis@hsph.harvard.edu]

Full_Name: Byron Ellis
Version: 1.2.2
OS: all
Submission from: (NULL) (140.247.105.95)


R_ext/Arith.h

#ifdef MAIN
#define extern
#endif
#ifdef __cplusplus
extern "C" {
#endif

these two should be reversed. Its never a problem because builds aren't done
against C++ compilers, but its still an error (just a low priority one).

also, you could change that to

#ifdef __cplusplus
extern "C" {
#endif
#ifdef __MAIN__
#define extern
#elif _MSC_VER
#define extern __dllspec(dllimport)
#endif

with the corresponding change to the #undef region. This would allow people to
develop for R using MSVC++ more easily.

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