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

[Stephen Neuendorffer via llvm-dev]

Aha!  Good guess. It definitely looks like it is confused with the clang
installed in your system somehow.

Steve

On Sun, Jul 12, 2020, 7:44 PM K Jelesnianski <kjski at vt.edu> wrote:

> 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.
>
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