# Building the Llvm tutorial with dune **URL:** \ **Category:** Learning\ **Tags:** ocamlbuild, llvm, jbuilder, build, dune\ **Created:** [November 22, 2018, 6:06pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944 "2018-11-22T18:06:10Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![abk](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/abk/32/1016_2.png) [@abk](https://discuss.ocaml.org/u/abk)\ **Post date:** [November 22, 2018, 6:06pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/1 "2018-11-22T18:06:10Z")
Hi everyone, I was trying to go through the LLVM OCaml tutorial [here](https://llvm.org/docs/tutorial/OCamlLangImpl1.html), but I wanted to build it using dune instead of ocamlbuild as is done in the tutorial. The error I’m getting is that there is no implementation for Llvm\_analysis: ```auto Error: No implementations provided for the following modules: Llvm_analysis referenced from lib/kaleidoscope_lib.cmxa(Kaleidoscope_lib__Codegen) ``` Any suggestions on how to fix this? Here is the dune file for my lib: ```auto (library (name kaleidoscope_lib) (libraries angstrom async core llvm) (preprocess (pps ppx_jane ppx_expect ppx_let)) (inline_tests)) ``` If I delete all the uses of Llvm\_analysis, but leave in the uses of Llvm, then everything builds fine. I can also see the files `llvm_analysis.cmi`, `llvm_analysis.cmx`, and `lllvm_analysis.mli` in `~/.opam/4.06.0/lib/llvm`, as well as `llvm_analysis.a`, `llvm_analysis.cma`, and `llvm_analysis.cmxa` in `~/.opam/4.06.0/lib/llvm/shared`, so I don’t think anything’s missing. For reference, this is the [build setup from the tutorial](https://llvm.org/docs/tutorial/OCamlLangImpl3.html#full-code-listing) (note that I’m using `angstrom` for my parser instead of `camlp4`): \_tags: ```ocaml <{lexer,parser}.ml>: use_camlp4, pp(camlp4of) <*.{byte,native}>: g++, use_llvm, use_llvm_analysis ``` myocamlbuild.ml: ```ocaml (* myocamlbuild.ml *) open Ocamlbuild_plugin;; ocaml_lib ~extern:true "llvm";; ocaml_lib ~extern:true "llvm_analysis";; flag ["link"; "ocaml"; "g++"] (S[A"-cc"; A"g++"]);; ``` ---
**Author:** ![mseri](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/mseri/32/91_2.png) [@mseri](https://discuss.ocaml.org/u/mseri)\ **Post date:** [November 22, 2018, 7:04pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/2 "2018-11-22T19:04:19Z")
What happens if you add `llvm_analysis` in the list of libraries in the dune file? ---
**Author:** ![abk](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/abk/32/1016_2.png) [@abk](https://discuss.ocaml.org/u/abk)\ **Post date:** [November 22, 2018, 7:39pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/3 "2018-11-22T19:39:19Z")
It can’t find the library (it’s not an opam package, just a module in the llvm package). ```auto File "lib/dune", line 8, characters 3-16: 8 | llvm_analysis) ^^^^^^^^^^^^^ Error: Library "llvm_analysis" not found. Hint: try: dune external-lib-deps --missing lib/.utop/utop.exe ``` I also checked out `dune rules` which has several references to `llvm/shared/llvm.cmxa`, but not `llvm/shared/llvm_analysis.cmxa`. ---
**Author:** ![rgrinberg](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/rgrinberg/32/40_2.png) [@rgrinberg](https://discuss.ocaml.org/u/rgrinberg)\ **Post date:** [November 22, 2018, 8:04pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/4 "2018-11-22T20:04:48Z")
Could you post the META file for the llvm library? It will be located in `$ ocamlfind query llvm`. Also, what is the output of `$ ocamlfind list | grep -i llvm`? It’s strange that llvm\_analysis is not found and yet the ocamlbuild build sees it. Anyway, my guess is that the problem lies in the META file of the llvm package. ---
**Author:** ![zshipko](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/zshipko/32/233_2.png) [@zshipko](https://discuss.ocaml.org/u/zshipko)\ **Post date:** [November 22, 2018, 8:16pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/5 "2018-11-22T20:16:50Z")
I believe you use `llvm.analysis` rather than `llvm_analysis` in your dune file. I can’t confirm this right now, so apologies if I’m mis-remembering. ---
**Author:** ![abk](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/abk/32/1016_2.png) [@abk](https://discuss.ocaml.org/u/abk)\ **Post date:** [November 23, 2018, 2:22pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/6 "2018-11-23T14:22:36Z")
Continuing the discussion from [Building the Llvm tutorial with dune](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/5): > [@rgrinberg](#): > > Could you post the META file for the llvm library? `ocamlfind query llvm` returns `~/.opam/4.06.0/lib/llvm` which has no META file: ```auto $ ls -I *.a -I *.mli -I *.cmi -I *.cmx ~/.opam/4.06.0/lib/llvm opam.config shared static ``` (also note that opam.config is empty). > [@rgrinberg](#): > > Also, what is the output of `$ ocamlfind list | grep -i llvm`? It’s strange that llvm\_analysis is not found and yet the ocamlbuild build sees it. ```auto $ ocamlfind list | grep -i llvm llvm (version: 6.0.0) llvm.all_backends (version: 6.0.0) llvm.analysis (version: 6.0.0) llvm.bitreader (version: 6.0.0) llvm.bitwriter (version: 6.0.0) llvm.executionengine (version: 6.0.0) llvm.ipo (version: 6.0.0) llvm.irreader (version: 6.0.0) llvm.linker (version: 6.0.0) llvm.passmgr_builder (version: 6.0.0) llvm.scalar_opts (version: 6.0.0) llvm.target (version: 6.0.0) llvm.transform_utils (version: 6.0.0) llvm.vectorize (version: 6.0.0) llvm_AArch64 (version: 6.0.0) llvm_AMDGPU (version: 6.0.0) llvm_ARM (version: 6.0.0) llvm_BPF (version: 6.0.0) llvm_Hexagon (version: 6.0.0) llvm_Lanai (version: 6.0.0) llvm_MSP430 (version: 6.0.0) llvm_Mips (version: 6.0.0) llvm_NVPTX (version: 6.0.0) llvm_PowerPC (version: 6.0.0) llvm_Sparc (version: 6.0.0) llvm_SystemZ (version: 6.0.0) llvm_X86 (version: 6.0.0) llvm_XCore (version: 6.0.0) ``` So that lists `llvm.analysis` as @zshipko mentioned. Also I should mention that I didn’t actually check that the ocamlbuild setup works, so maybe it has the same problem. Thanks for all the suggestions. ---
**Author:** ![abk](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/abk/32/1016_2.png) [@abk](https://discuss.ocaml.org/u/abk)\ **Post date:** [November 23, 2018, 2:23pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/7 "2018-11-23T14:23:30Z")
> [@zshipko](#): > > I believe you use `llvm.analysis` rather than `llvm_analysis` in your dune file. Yes that worked. Thanks for the help. ---
**Author:** ![jeremiedimino](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/jeremiedimino/32/699_2.png) [@jeremiedimino](https://discuss.ocaml.org/u/jeremiedimino)\ **Post date:** [November 26, 2018, 8:41am UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/8 "2018-11-26T08:41:35Z")
BTW, last time I checked llvm used the old META file layout, so its META file was `META.llvm` in the library directory rather than `llvm/META` ---
**Author:** ![perry](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/perry/32/518_2.png) [@perry](https://discuss.ocaml.org/u/perry)\ **Post date:** [November 26, 2018, 1:50pm UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/9 "2018-11-26T13:50:24Z")
On a wider note, the LLVM tutorial is based on very old OCaml features. It uses camlp4 for example. It probably should be updated by someone. ---
**Author:** ![abk](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/abk/32/1016_2.png) [@abk](https://discuss.ocaml.org/u/abk)\ **Post date:** [November 29, 2018, 2:45am UTC](https://discuss.ocaml.org/t/building-the-llvm-tutorial-with-dune/2944/10 "2018-11-29T02:45:23Z")
Ah yes, `META.llvm` is in lib directory. In addition to using old OCaml features, the tutorial also seems to be based on outdated LLVM as well.