llvm dev - Mar 2018 - How to link against all available targets - problems with NVPTX?

As the question asks, I'm having some trouble using initializeAllTargets().

I have a CMakeLists that uses:

llvm_map_components_to_libnames(LLVM_LIBS ...
    AllTargetsAsmParsers
    AllTargetsAsmPrinters
    AllTargetsDescs
    AllTargetsInfos
    ...)

However, even with these,  when I try to compile my program, I get linker
errors:

CMakeFiles/sxhc.dir/src/main.cpp.o: In function
`llvm::InitializeAllTargets()':
/home/bollu/.local/include/llvm/Config/Targets.def:27: undefined reference
to `LLVMInitializeNVPTXTarget'
CMakeFiles/sxhc.dir/src/main.cpp.o: In function
`llvm::InitializeAllAsmPrinters()':
/home/bollu/.local/include/llvm/Config/AsmPrinters.def:28: undefined
reference to `LLVMInitializeNVPTXAsmPrinter'
collect2: error: ld returned 1 exit status
CMakeFiles/sxhc.dir/build.make:285: recipe for target 'sxhc' failed
make[2]: *** [sxhc] Error 1
CMakeFiles/Makefile2:131: recipe for target 'CMakeFiles/sxhc.dir/all'
failed
make[1]: *** [CMakeFiles/sxhc.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2


That is, NVPTX is not initialized as a target properly. I'm somewhat
puzzled by this, because I would have assumed that the  NVPTXAsmPrinter
would have been linked by  AllTargetsAsmPrinters.


The hack I have right now is to manually add NVPTXCodeGen to the list of
llvm_map_components_to_libnames.

Clearly, I'm doing something wrong, could someone point me to what I might
be screwing up? In short, *what is the correct way to setup targets*? Is
what I'm asking for (automatically link against all targets picked up by
initializeAllTargets() an anti-pattern? if so, why?)


Thanks,
~Siddharth
-- 
Sending this from my phone, please excuse any typos!
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Hi Siddharth,

can you verify that LLVMNVPTXAsmPrinter is actually the missing component
library and not LLVMNVPTXCodeGen? Because AllTargetsAsmPrinter should
absolutely pull in the former, but I can see how the latter is missing.

That being said, if you want to just link to everything all the included
targets require, you can do this:

llvm_map_components_to_libnames(LLVM_LIBS ${LLVM_TARGETS_TO_BUILD})

Cheers,
Philip


2018-03-19 11:55 GMT+01:00 Siddharth Bhat via llvm-dev <
llvm-dev at lists.llvm.org>:
> As the question asks, I'm having some trouble using
initializeAllTargets().
>
>
> I have a CMakeLists that uses:
>
> llvm_map_components_to_libnames(LLVM_LIBS ...
>     AllTargetsAsmParsers
>     AllTargetsAsmPrinters
>     AllTargetsDescs
>     AllTargetsInfos
>     ...)
>
> However, even with these,  when I try to compile my program, I get linker
> errors:
>
> CMakeFiles/sxhc.dir/src/main.cpp.o: In function
> `llvm::InitializeAllTargets()':
> /home/bollu/.local/include/llvm/Config/Targets.def:27: undefined
> reference to `LLVMInitializeNVPTXTarget'
> CMakeFiles/sxhc.dir/src/main.cpp.o: In function `llvm::
> InitializeAllAsmPrinters()':
> /home/bollu/.local/include/llvm/Config/AsmPrinters.def:28: undefined
> reference to `LLVMInitializeNVPTXAsmPrinter'
> collect2: error: ld returned 1 exit status
> CMakeFiles/sxhc.dir/build.make:285: recipe for target 'sxhc' failed
> make[2]: *** [sxhc] Error 1
> CMakeFiles/Makefile2:131: recipe for target
'CMakeFiles/sxhc.dir/all'
> failed
> make[1]: *** [CMakeFiles/sxhc.dir/all] Error 2
> Makefile:83: recipe for target 'all' failed
> make: *** [all] Error 2
>
>
> That is, NVPTX is not initialized as a target properly. I'm somewhat
> puzzled by this, because I would have assumed that the  NVPTXAsmPrinter
> would have been linked by  AllTargetsAsmPrinters.
>
>
> The hack I have right now is to manually add NVPTXCodeGen to the list of
> llvm_map_components_to_libnames.
>
> Clearly, I'm doing something wrong, could someone point me to what I
> might be screwing up? In short, *what is the correct way to setup targets*
> ? Is what I'm asking for (automatically link against all targets picked
> up by initializeAllTargets() an anti-pattern? if so, why?)
>
>
> Thanks,
> ~Siddharth
> --
> Sending this from my phone, please excuse any typos!
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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