[gentoo-alt] emake shell

[Markus Duft]

Hi!

I'm having problems on Interix6 systems regarding the system's /bin/sh.
gmake uses it by default, and if it does this, I get occasional crashes
somewhere in gmake (!?), and I'm absolutely unable to get either a readable
backtrace or any other information about what's the problem. As soon as I
start debugging, the problem vanishes in the dark.... ugh...

The good news is, that there is a "workaround". If - in emake - I do "$MAKE
SHELL=$BASH ..." things work flawlessly everytime. Now my questions:

1) can it do any harm to do this? Bash is guaranteed to be in use inside
ebuilds, right? So this should not matter. Could there be makefiles which do
something that bad, that bash doesn't choke it?

2) if this is added, should it be added for all platforms, or for interix
only?

3) should this be added in prefix, or in main?

Cheers, Markus