[R-SIG-Win] GCC 5.3.0 - sd(NA) = NaN?

[Avraham Adler]

Hello.

As an experiment, I tried compiling R with the mingw64 5.3.0 (posix-seh)
build. R compiles smoothly, but make check fails pretty early as sd(NA)
returns NaN instead of NA, which is a fatal error in the tests.I have no
idea what may cause this, but thought it may be of interest to this group.
I'd appreciate it if someone who understands why that happens would post a
brief explanation.

Thanks,

Avi

	[[alternative HTML version deleted]]