Older versions of gcc

[ladislas]

As of today, we have 3 versions of GCC:

• latest (6.3.0)
• 4.9
• 4.8

We don't have 5.x.

I'm wondering if we should have them all, or none at all. Doesn't really make sense to jump from 4 to 6. In homebrew they have all the versions from 4.6 to 5. My opinion would be to keep only the latest version of each big version:

• 4.x
• 5.x
• 6.x
• etc.

but don't bother with multiple versions of each.

And regarding binutils and avr-libc, only keep the latest version. If they are not compatible with older version of gcc, drop support of those versions of gcc.

what do you thing?

[larsimmisch]

Yes, I think having the latest version of each major version would be great. So remove 4.8 and add 5.3.

We could also think about 4.9.3 instead of 4.9 (from https://gcc.gnu.org/releases.html)

[ladislas]

agreed. I'll take care of it!

also, I think that following the new homebrew rule for naming version like avr-gcc@5.3 would be best.

[ladislas]

closing this issue as I just merged #54