[gentoo-user] gcc-5.0 ?

[james]

Hello,

I need access to the latest gcc compiler for some experimental work
with some GPU enabled coding. [1,2] 

So using this latest gcc compiler just for compiling some fancy new cluster
codes using RDMA, is liable (probably ?) to be a wee bit tricky.
Now, assuming I find an overlay somewhere, how do I go about ensuring
it is slotted and only used with specific syntax just for a few codes
and nothing on my general portage tree?

Also, I have not found a gcc-5.0 or gcc-5.1 in an overlay (yet), but
I did find this gcc-9999 by zorry[3]. It does not look to be gcc-5.x but I
am as yet uncertain on that.  

Any discussion or suggestions how to best get access to gcc-5.x
is most appreciated; as is methods to using it (control it) limited
to just a few codes.


James

[1] https://gcc.gnu.org/wiki/OpenACC

[2] https://gcc.gnu.org/gcc-5/changes.html#offload
under: OpenMP 4.0 specification

[3] http://gpo.zugaina.org/sys-devel/gcc