[llvm-dev] Linking against LLVM and conflicting with system mesa

[C Bergström via llvm-dev]

What we do to avoid this problem is rename the lib to something else. No
system conflict and problem averted. It should be a trivial cmake change.



On Sat, Jun 24, 2017 at 11:32 AM, Zion Nimchuk via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all!
>
> I'm stumped. I'm a contributor to an Open Source PS3 emulator. We use LLVM
> to pre-compile the code, instead of just interpreting it at runtime like
> most emulators do. Website here: https://github.com/RPCS3/rpcs3/
> <https://github.com/RPCS3/rpcs3/>
>
> We currently have support for Windows, Linux and BSD. Currently, we only
> provide builds for Windows users, and are interested in providing builds
> for linux users via AppImages.
>
> The problem is that we use OpenGL or Vulkan to render the graphics, and if
> the driver is using Mesa, Mesa tries to bring along LLVM, and then we get a
> nasty "CommandLine Error: Option 'help-list' registered more than once!"
>
> We previously just linked LLVM statically, and to remedy the error
> mentioned above, we just switched to linking LLVM dynamically.
>
> This starts getting messy when we start sending out binaries. Most distros
> ares still stuck on LLVM 3.x, and we're using LLVM 4. If we just package
> the LLVM 4 libs with the binary, then mesa tries to load 3.x and llvm tries
> to load 4.x. Not good.
>
>
> The only solution we've come up with is to provide a modified version of
> LLVM with the binary build that somehow hides itself. Can anyone show me
> what code I would need to modify in order to make this work?
> If you do have a better solution, please mention it.
>
>
> Thanks, Zion Nimchuk
>
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