project can't find files from llvm | Together C & C++ | Page 1

tired root Dec 9, 2024, 3:02 AM

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I'm running the following

clang++ -o eva-llvm `llvm-config --cxx-flags --ldflags --system-libs --libs core` EvaLLVM.cpp

and getting the following

././src/EvaLLVM.h:6:10: fatal error: 'llvm/IR/IRBuilder.h' file not found
    6 | #include "llvm/IR/IRBuilder.h"
      |          ^~~~~~~~~~~~~~~~~~~~~

i have the following when printing --cxxflags

interpretations@Daniels-MacBook-Pro eva-llvm % llvm-config --cxxflags                                                   
-I/opt/homebrew/Cellar/llvm/19.1.5/include -std=c++17 -stdlib=libc++   -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS

And can validate that the file is there with ls
So why can't clang find it?

loud onyxBOT Dec 9, 2024, 3:02 AM

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When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

summer vortex Dec 9, 2024, 3:02 AM

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is /opt/homebrew/Cellar/llvm/19.1.5/include populated as you'd expect?

tired root Dec 9, 2024, 3:03 AM

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yes

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it has llvm/IR/IRBuilder.h in it

summer vortex Dec 9, 2024, 3:03 AM

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maybe try #include <llvm/IR/IRBuilder.h>

tired root Dec 9, 2024, 3:04 AM

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same error

summer vortex Dec 9, 2024, 3:04 AM

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can you which clang++

tired root Dec 9, 2024, 3:04 AM

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/opt/homebrew/opt/llvm/bin/clang++

summer vortex Dec 9, 2024, 3:05 AM

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out of curiosity does /opt/homebrew/Cellar/llvm/19.1.5/bin/clang++ exist

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I'm wondering if it's using the wrong clang

tired root Dec 9, 2024, 3:06 AM

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yeah

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i tried moving it somewhere else which didn't help

summer vortex Dec 9, 2024, 3:08 AM

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I was going to suggest trying /opt/homebrew/Cellar/llvm/19.1.5/bin/clang++ -o eva-llvm `llvm-config --cxx-flags --ldflags --system-libs --libs core` EvaLLVM.cpp

tired root Dec 9, 2024, 3:09 AM

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moved it back and got the same error

summer vortex Dec 9, 2024, 3:09 AM

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hmm

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well, as a last resort you can try running clang with verbose mode to see what flags it's actually getting and what paths it's searching for headers

tired root Dec 9, 2024, 3:11 AM

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📎 message.txt

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is it weird that it's using clang-19 instead of clang++?

summer vortex Dec 9, 2024, 3:13 AM

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I don't think so, it's the same binary (generally just a sym link, the clang binary handles both languages)

tired root Dec 9, 2024, 3:13 AM

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hmm

summer vortex Dec 9, 2024, 3:14 AM

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tired root

the clang invocation here doesn't have any -I flags

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it does have -internal-isystem /opt/homebrew/Cellar/llvm/19.1.5/lib/clang/19/include though

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but that's not quite what llvm-config spat out

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can you send the full output of llvm-config --cxx-flags --ldflags --system-libs --libs core

tired root Dec 9, 2024, 3:15 AM

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oh weird

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it's not printing the right thing naymore

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📎 message.txt

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help options

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nvm fixed

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interpretations@Daniels-MacBook-Pro eva-llvm % llvm-config --cxxflags --ldflags --system-libs --libs core
-I/opt/homebrew/Cellar/llvm/19.1.5/include -std=c++17 -stdlib=libc++   -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-L/opt/homebrew/Cellar/llvm/19.1.5/lib -Wl,-search_paths_first -Wl,-headerpad_max_install_names
-lLLVM-19

loud onyxBOT Dec 9, 2024, 3:17 AM

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@tired root

It looks like you may have code formatting errors in your message

Note: Make sure to use back-ticks (`) and not quotes (')
Note: Make sure to specify a highlighting language, e.g. `cpp`, after the back-ticks

Markup

```cpp
int main() {}
```

Result

int main() {}

summer vortex Dec 9, 2024, 3:19 AM

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tired root help options

that'd do it

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so llvm-config --cxx-flags --ldflags --system-libs --libs core wrote nothing to stdout only stderr

tired root Dec 9, 2024, 3:20 AM

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yeah i have all these new errors now

summer vortex Dec 9, 2024, 3:20 AM

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yay

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new errors are good

tired root Dec 9, 2024, 3:20 AM

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lol yeah

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././src/EvaLLVM.h:29:22: error: no matching constructor for initialization of 'std::unique_ptr<llvm::Module>'
   29 |             module = std::unique_ptr<llvm::Module>("EvaLLVM", *ctx);
      |                      ^                             ~~~~~~~~~~~~~~~

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formatting... the carat is pointing at "EvalLLVM" string arg

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void moduleInit() {
            ctx = std::unique_ptr<llvm::LLVMContext>();
            module = std::unique_ptr<llvm::Module>("EvaLLVM", *ctx);
            builder = std::unique_ptr<llvm::IRBuilder<>>(*ctx);
        }

summer vortex Dec 9, 2024, 3:24 AM

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I don't see the problem

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what does it say about why there was no match

tired root Dec 9, 2024, 3:25 AM

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do i need to include something to have access to std::unique_ptr?

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did a screenshot to try and keep the formatting

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and here's the whole giant error... it has another issue in teh other place i try to use unique_ptr

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📎 message.txt

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interesting it cares about the bottom two lines but not the first usage

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ctx = std::unique_ptr<llvm::LLVMContext>();
module = std::unique_ptr<llvm::Module>("EvaLLVM", *ctx);
builder = std::unique_ptr<llvm::IRBuilder<>>(*ctx);

summer vortex Dec 9, 2024, 3:46 AM

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tired root do i need to include something to have access to std::unique_ptr?

<memory>, but it's pretty much always included by something else already

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oh, use std::make_unique 😛

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std::unique_ptr<llvm::Module>("EvaLLVM", *ctx); doesn't forward arguments to any constructor, it expects to take a pointer or instance of the object

tired root Dec 9, 2024, 3:48 AM

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that was it! thanks!

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!solved

loud onyxBOT Dec 9, 2024, 3:48 AM

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Thank you and let us know if you have any more questions!

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