Prof Brian Ripley wrote:
First, there are no versions 1.7, 1.8 and 1.9.
Sorry for my misuse of the version numbers.
Was your version of R compiled against MSVC++ 6.0? The binary on CRAN was
not, and binaries for different versions of R were compiled with different
versions of MinGW. The entry point isnan is part of the statically linked
runtime on modern MinGW.
I used the binary on CRAN.
MSVC++ 6.0 does supply _isnan (as it really should as it is part of the
C99 ISO standard), and you need to link against it appropriately. Hint:
it may have an extra underline, since it seems it is known to C as _isnan.
You may need to add
#undef ISNAN
#define ISNAN(x) _isnan(x)
Many thanks for this suggestion. It works, as always. The extra
underline is required.
We don't support adding extensions to R using a different compiler to the
one used to build R. Changes already made for future releases of R will
make this less likely to work in R 2.0.x.
I wish that the R API entry points documented in "Writing R Extensions"
be supported in the future versions of R, because it will make programs
built with R more portable than directly using compiler-specific
functions, such as testing and generating the IEEE 754 special values.
The existing entry points have saved me trouble to chase these values
whenever I moved to an environment with a different compiler.
Thank you Brian for your help.
Paul.
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