[Bug 236900] lang/gcc8: BOOTSTRAP=off fails to build after r497254

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236900

Mark Millard <marklmi26-fbsd at yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |marklmi26-fbsd at yahoo.com

--- Comment #4 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Andreas Tobler from comment #3)

Looks like (system) clang rejects the option:

# cc -v -print-multi-os-directory
cc: error: unsupported option '-print-multi-os-directory'
FreeBSD clang version 8.0.0 (tags/RELEASE_800/final 356365) (based on LLVM
8.0.0)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin

# c++ -v -print-multi-os-directory
c++: error: unsupported option '-print-multi-os-directory'
FreeBSD clang version 8.0.0 (tags/RELEASE_800/final 356365) (based on LLVM
8.0.0)
Target: powerpc64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin

So it appears that a successful build would have had to use the option with
some gcc version instead of (system) clang.

So the question translates to: what contextual difference leads to use with
clang some times vs. gcc other times? Lack of a full bootstrap vs. using
a full bootstrap?

(Note: the powerpc64 context above is based on WITHOUT_LIB32= because of
my llvm-libunwind patch testing.)

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