[Bug 263976] editors/libreoffice: Fails to build if LLVM_DEFAULT=90 (default) and LTO=on (non-default)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263976

--- Comment #11 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Dimitry Andric from comment #10)

Tomoaki AOKI is the one building with LTO enabled
and hitting the odd way editors/libreoffice is
set up for handling such. My normal activities do
not include building editors/libreoffice.

editors/libreoffice is set up to not use devel/llvm*
at all when LTO is off and to use
devel/llvm${LLVM_DEFAULT} when LTO is turned on.
That is the way its Makefile ends up working.

As far as I can tell, if one forced LTO to be off
but also forced LLVM_DEFAULT=90 , the compile error
reported would still happen: devel/llvm90 is
apparently too old to be used.

But if one forces LTO to be on but does not also force
a specific devel/llvm* to be used, one ends up with
devel/llvm90 and ends up with the compile errors
reported.

So, as editors/libreoffice is set up, to use LTO
one must also control which devel/llvm* is used
to form a coherent combination.

There may be a better way for editors/libreoffice
to be set up --but I've not been working on proposing
changes, just documenting the current status and why
the reported things happened and why they were not
llvm 14 tied.

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