[Bug 239682] Default to devel/llvm90 when libLLVM/libclang are required or if /usr/bin/clang is not enough

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239682

--- Comment #18 from Jan Beich <[email protected]> ---
(In reply to Mark Linimon from comment #17)
Runtime. Loading more than one libLLVM.so version can lead to crashes. A
consumer cannot block other consumers from switching. If only one devel/llvm
existed (like in OpenBSD Ports) then it'd be mainly about making consumers
build.

For example, OpenGL application can load LLVM via graphics/mesa-dri and as part
of its own usage. In the past emulators/rpcs3 was affected until it switched to
static linking and later to bundled LLVM copy of development snapshot.

Currently, I suspect lang/clover is affected. Pining mesa-dri and blocking
OpenGL-based LLVM consumers from switching just because a barely usable OpenCL
implementation isn't compatible yet due to being based on very old upstream
release would be silly.

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