bug#39794: AVR-Toolchain-5 avr/io not found

[Ekaitz Zarraga]

Follow up of the problem:

Looks like what it's missing is `multilib`, avr-gcc-4.9 package description 
clearly activates multilib and states that in a comment:


(define-public avr-gcc-4.9
  (let ((xgcc (cross-gcc "avr" #:xgcc gcc-4.9 #:xbinutils avr-binutils)))
    (package
      (inherit xgcc)
      (name "avr-gcc")
      (arguments
       (substitute-keyword-arguments (package-arguments xgcc)
         ((#:phases phases)
          `(modify-phases ,phases
             ;; Without a working multilib build, the resulting GCC lacks
             ;; support for nearly every AVR chip.
             (add-after 'unpack 'fix-genmultilib
               (lambda _
                 ;; patch-shebang doesn't work here because there are actually
                 ;; several scripts inside this script, each with a #!/bin/sh
                 ;; that needs patching.
                 (substitute* "gcc/genmultilib"
                   (("#!/bin/sh") (string-append "#!" (which "sh"))))
                 #t))))
         ((#:configure-flags flags)
          `(delete "--disable-multilib" ,flags))))
...


But looks like the avr-gcc-5.5, which is just inheriting the same description, 
is not able to create the multilib.
Any idea about why?

I think once we solve that we could have a reasonable avr-toolchain and also go 
for newer versions.

Regards,

Ekaitz


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