Commit 5f6887e8 fixes this for GCJ, but we still have this problem for all variants of gfortran, gcc-objc, and gccgo, all of which are built using the ‘custom-gcc’ procedure.
It’s probably safe to add a build phase like this to ‘custom-gcc’:
(add-after 'install 'remove-broken-or-conflicting-files
(lambda* (#:key outputs #:allow-other-keys)
(for-each delete-file
(find-files (string-append (assoc-ref outputs "out") "/bin")
".*(c\\+\\+|cpp|g\\+\\+|gcc.*)"))
#t))
~~ Ricardo
