llvm dev - Nov 2016 - add_library cannot create target "LLVMTarget" because an imported target with the same name already exists.

Hi,

I am trying to make my pass compiling inside the LLVM tree or outside.
It works when I include my pass inside the tools folder, however when I try to
compile it outside the LLVM tree I get the following error:

"add_library cannot create target "LLVMTarget" because an
imported target with the same name already exists.”

It happens when I’ve already compiled and installed my target from within LLVM.

I was wondering if there is a way to ignore that and just overwrite the target.

Thanks.
Best,
Simone

Hi Simone,

Sorry for the delayed response.

LLVMTarget is a library provided by LLVM, you shouldn't be naming your own
targets to conflict with the names already in LLVM. CMake does not allow
multiple targets to have the same name because it causes ambiguities in the
build system.

-Chris
> On Nov 20, 2016, at 2:00 PM, Simone Atzeni via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> Hi,
> 
> I am trying to make my pass compiling inside the LLVM tree or outside.
> It works when I include my pass inside the tools folder, however when I try
to compile it outside the LLVM tree I get the following error:
> 
> "add_library cannot create target "LLVMTarget" because an
imported target with the same name already exists.”
> 
> It happens when I’ve already compiled and installed my target from within
LLVM.
> 
> I was wondering if there is a way to ignore that and just overwrite the
target.
> 
> Thanks.
> Best,
> Simone
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Hi Chris,

sorry I was just using a dummy name for the library but that wasn’t the name
that was giving me the error.
However, what I am experiencing is that if I build and install my pass within
the LLVM source I cannot install my library if I build it out-of-tree as a
standalone library.
The OpenMP runtime allows that though, any solution?

Thanks!
Best,
Simone
> On Nov 28, 2016, at 15:22, Chris Bieneman <beanz at apple.com> wrote:
> 
> Hi Simone,
> 
> Sorry for the delayed response.
> 
> LLVMTarget is a library provided by LLVM, you shouldn't be naming your
own targets to conflict with the names already in LLVM. CMake does not allow
multiple targets to have the same name because it causes ambiguities in the
build system.
> 
> -Chris
> 
>> On Nov 20, 2016, at 2:00 PM, Simone Atzeni via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>> 
>> Hi,
>> 
>> I am trying to make my pass compiling inside the LLVM tree or outside.
>> It works when I include my pass inside the tools folder, however when I
try to compile it outside the LLVM tree I get the following error:
>> 
>> "add_library cannot create target "LLVMTarget" because
an imported target with the same name already exists.”
>> 
>> It happens when I’ve already compiled and installed my target from
within LLVM.
>> 
>> I was wondering if there is a way to ignore that and just overwrite the
target.
>> 
>> Thanks.
>> Best,
>> Simone
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>