[R-SIG-Win] An update on the windows toolchain developments

[Avraham Adler]

Hello, Jeroen.

Regarding the Rf_error, does the issue still exist in v4 of GCC 4.9.2
and is a regression in 4.9.3, or has it never been solved in 4.9.2
either?

Regarding the Rcpp error, wouldn't throwing no-sse also prevents the
use of almost all vecotrizations (sse2-4.1 and avx/avx2), slowing
results down noticeably?


Avi

On Mon, Aug 31, 2015 at 9:14 AM, Jeroen Ooms <jeroenooms at gmail.com> wrote:
> A new version of the toolchain based on gcc 4.9.3 and corresponding
> build of R-devel are available from [1]. See the readme.txt [2] for
> details. The installer should work out of the box and make it easy for
> Windows users to compile and test R packages with the new toolchain.
>
> The bad news: unfortunately it appears that the sjlj problem on win64
> (triggered by Rf_error) is still not completely solved in the latest
> mingw-w64. Therefore I restored -fno-asynchronous-unwind-tables in
> CXXFLAGS in the latest build of R. This workaround allows us to move
> forward while we investigate this problem.
>
> Even with -fno-asynchronous-unwind-tables there are still two Rcpp
> unit tests that crash on win64: test.Module.member and
> test.Module.property. These tests segfault when an exception is raised
> within a module. The problem still exists in the latest Rcpp version
> from Github. It is unclear if this is related to the sjlj bug above,
> or a separate problem in Rcpp / R-devel. The issue can be worked
> around by changing Rcpp's Makevars.win to:
>
>    PKG_CXXFLAGS=-mno-sse
>
> With this fix, Rcpp is able to execute all unit tests on both win32
> and win64. All tests pass, except for an issue with dates (also only
> on win64) that is reported at [3].
>
> [1] http://www.stat.ucla.edu/~jeroen/mingw-w64/
> [2] http://www.stat.ucla.edu/~jeroen/mingw-w64/readme.txt
> [3] https://github.com/RcppCore/Rcpp/issues/359
>
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