[Bug 224217] [patch] Fix cross build of base/ ports

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224217

--- Comment #26 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Mark Millard from comment #23)

Turns out that a modern devel/powerpc64-binutils
uses powerpc64-unknown-freebsd12.0- prefixes,
just like base/binutils does. The same goes
for devel/powerpc64-gcc and base/gcc .

So base/binutils and devel/powerpc64-binutils
end up with PATH controlling which directory
is used when the path is implicit, just like
base/gcc vs. devel/powerpc64-gcc does.

The above is stated for a powerpc64 context
with both a base/{binutils,gcc} pair installed
and a devel/powerpc64-{binutils,gcc} pair built
and installed. /usr/bin/ vs. /usr/local/bin/
and the like being involved for PATH use when
not explicit.

(I need to be careful of this once I get to the
point of testing base/{binutils,gcc} use in my
powerpc64 context. I normally have
devel/powerpc64-{binutils,gcc} installed and so
could implicitly use the wrong files.)

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