[llvm-dev] LLVM source compilation Error: CommandLine Error: Option 'mc-relax-all' registered more than once!

[K Jelesnianski via llvm-dev]

I found a work around. I did some more poking around my system and
found where the default install location of all
libLLVM* libraries and
libclang* libraries were installed. Specifically
$ /usr/local/lib
I was hesitant but when I deleted all libclang* and libLLVM* files. I
was able to get past this error.

Thanks again.

On Sun, Jul 12, 2020 at 10:22 PM K Jelesnianski <kjski at vt.edu> wrote:
>
> Thanks for your quick reply. I have also tried disabling build shared
> libs, specifying via
> "-DBUILD_SHARED_LIBS=OFF" in my cmake config line
> However I am getting the same exact error with this flag specified as well.
>
> Just an idea, would removing all llvm/clang instances/libs on my
> machine work? Do you know what the default location is of these
> shared/static llvm libraries that are conflicting?
>
> I'm not exactly sure how to do this via command line on linux though.
> I definitely agree this is related to  linkage error as you say. I'm
> just not sure what I have to remove to get this server to go back to a
> "clean slate" state such that I can build llvm-project. That is
> information I have been looking for, but can't seem to find and this
> error doesn't seem to be well documented.
> I have already tried the following, but it didn't help either
> $ sudo su
> $ dnf remove llvm
> $ dnf remove clang
>
> and then performing
> $ sudo dnf install llvm
> $ sudo dnf install clang
>
> To give more context, I can do a clean install of vanilla llvm-project
> on other servers I have access to, but can't currently afford to move
> my code base to these other servers.