[Rd] 64-bit integer type warning on windows
edd at debian.org
Wed Mar 14 13:07:12 CET 2018
On 13 March 2018 at 17:29, Christophe DUTANG wrote:
| So, I was wondering if this warning was removable at all? Does anyone encounter this issue?
That is a pretty old topic.
Did you look into Writing R Extensions? The first mention is
* Do be very careful with passing arguments between R, C and FORTRAN
code. In particular, 'long' in C will be 32-bit on some R
platforms (including 64-bit Windows), but 64-bit on most modern
Unix and Linux platforms. It is rather unlikely that the use of
'long' in C code has been thought through: if you need a longer
type than 'int' you should use a configure test for a C99/C++11
type such as 'int_fast64_t' (and failing that, 'long long' (8)) and
typedef your own type to be 'long' or 'long long', or use another
suitable type (such as 'size_t').
It is not safe to assume that 'long' and pointer types are the same
size, and they are not on 64-bit Windows. If you need to convert
pointers to and from integers use the C99/C++11 integer types
'intptr_t' and 'uintptr_t' (which are defined in the header
'<stdint.h>' and are not required to be implemented by the C99
standard but are used in C code by R itself).
Note that 'integer' in FORTRAN corresponds to 'int' in C on all R
(8) but note that 'long long' is not a standard C++98 type, and C++
compilers set up for strict checking will reject it.
so with C++11 you get by: simply make your package use 'CXX_STD = CXX11'.
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