02:54 <TwoNotes> llvm::FunctionPass::createPrinterPass undefined when I link ponyc. using LLVM 3.8.1

14:21 <TwoNotes> Any preference between LLVM versions? Is 3.9.0 best?

14:26 <Praetonus> Generally speaking, yes

14:26 <Praetonus> Better optimisations

14:27 <TwoNotes> 3.9.0 llvm-config expects to find libcursesw.so.6. I only have .5

14:27 <TwoNotes> I will have to check the llvm release notes for requirements

14:28 <TwoNotes> But last time I tried 3.8.1, I got a missing symbol at lilnk time,

14:28 <TwoNotes> llvm::FunctionPass::createPrinterPass undefined when I link ponyc. using LLVM 3.8.1

14:28 <TwoNotes> 14:21 <TwoNotes> Any preference between LLVM versions

14:28 <TwoNotes> oops

14:29 <TwoNotes> llvm::FunctionPass::createPrinterPass was undefined at ponyc link phase

14:31 <Praetonus> I've seen that before. IIRC, it's because the LLVM headers and libs found have a different version

14:32 <Praetonus> Maybe try it with only LLVM 3.8.1 in your PATH

16:06 <TwoNotes> No luck. Building ponyc with LLVM 3.8.1 I get this linker error: build/release/libponyc.a(genopt.o):(.rodata._ZTV11HeapToStack[_ZTV11HeapToStack]+0x20): undefined reference to `llvm::FunctionPass::createPrinterPass(llvm::raw_ostream&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const'

16:13 <TwoNotes> Here is log with more context. https://gist.github.com/pdtwonotes/d9458b667d1100776daa6fdba90215b1

16:14 <TwoNotes> I used "make LLVM_CONFIG=path-to-llvm-config"

16:21 <SeanTAllen> previously when people have gotten that error, the linker was confused and using a different llvm than what compilation was done with

16:55 <TwoNotes> The LLVM I am using came as a bunch of precompiled libraries. All I did was point LLVM_CONFIG to the right place, assuming the Makefile would do the right thing

16:55 <TwoNotes> If I could find instructions on how to properly 'install' all these LLVM 3.8.1 bits, I would do that

16:56 <TwoNotes> LLVM project does have packages for Ubuntu, but not for my ARM platform. And it is a monster to compile

16:57 <TwoNotes> But they had these tar files of precompild binaries, so I am using that

17:01 <TwoNotes> The Makefile appears to be getting ldflags properly...

17:14 <Praetonus> Do you have another version of LLVM installed?

17:24 <TwoNotes> There is a 3.8.0 that came with the system. I was hesitating to remove that in cage gcc needed it. But I can always add it back again if so. I will try removing it

17:25 <TwoNotes> It was just the runtime, libllvm3.8

17:28 <TwoNotes> typeing 'apt remove libllvm3.8' makes apt think it needs to remove 227 packages....

17:30 <TwoNotes> Including a LOT of stuff I depend on...

17:38 <TwoNotes> I do apt search llvm | grep installed and get just one line, "libllvm3.8/xenial-updates,now 1:3.8-2ubuntu4 armhf [installed]"

17:41 <TwoNotes> But I do not actually see any *llvm* files anywhere in /usr/lib

17:41 <TwoNotes> or in /usr/bin

17:48 <TwoNotes> I will try copying the LLVM stuff off the NFS share onto the local storage

18:25 <andreaa> SeanTAllen, was yesterday's sync recorded?

19:03 <SeanTAllen> yes but i haven't had a chance to upload it

19:15 <SeanTAllen> uploading now.

19:15 <SeanTAllen> at my mother's upload speeds are pretty slow

19:36 <SeanTAllen> uploaded

20:31 <TwoNotes> I added an @echo command inside Makefile to show the full linker command. The result with error messages is at https://gist.github.com/pdtwonotes/11a78530dcd0fa61d3e5991517d1b4a2

20:52 <TwoNotes> The missing symbol *is* defined in the .a and .so files of the llvm library...

21:42 <TwoNotes> The missing symbol is defined in file libLLVMCore.a, which *does* appear in the list od "-l" terms given to th elinker.

21:44 <TwoNotes> Defined symbol has signature (llvm::raw_ostream&, std::string) while error message says (llvm::raw_ostream&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >). Different notations of the same thing?

22:11 <TwoNotes> I don't think ponyc itself calls createPrinterPass. I think it is somewhere in the FunctionPass class that ponyc extends.

22:12 <TwoNotes> All 3 references come from ponyc's "genopt" module, and I found no explicit references there

22:32 <TwoNotes> createPrinterPass is a public function of "FunctionPass", which is used to implement most optimizations

22:43 <TwoNotes> I guess I have no clue which versions of LLVM work properly on ARM. This *was* working several months ago but I do not remember what versions that was.