llvm dev - Jul 2020 - LLVM source compilation Error: CommandLine Error: Option 'mc-relax-all' registered more than once!

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.

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.

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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