Brew llvm and xcode?

Varoudis · July 26, 2017, 9:25am

Hi all,

Has anyone managed to use a brew-ed llvm/clang with of and xcode?
I need openMP support.

I manages to link the new llvm in xcode (just hacked an ln -s of the ‘usr’ dir) but then Im missing the libtool and the brew libtool is not the same.
It was a hack so Im not sure if that was my only problem.

A brew gcc with of/xcode would be ok but I think that is not supported at all.

Thanks

bakercp · July 26, 2017, 4:57pm

Here are instructions for using OpenMP with Xcode brew’s llvm/clang. I had to get it working for ofxFAISS.

github.com

bakercp/ofxFAISS/blob/master/docs/GETTING_STARTED.md#osx

## Getting Started

1. From the `scripts/` directory ...
  - `./install.sh`
2. Generate project examples using Project Generator or an IDE Plugin.
  - _On Xcode, you will need to make a few minor modifications, see below._
3. FAISS can run on the CPU or on the GPU. If you compiled FAISS with CUDA support (e.g. on Linux), the examples prefixed with `example_gpu_` will work.  Examples prefixed with `example_cpu_` should work on any supported system.

## Developer Notes

### OSX

Did you get a message like _Warning: OpenMP is NOT activated"?

FAISS requires [OpenMP](http://www.openmp.org/) support. At the time of writing, Xcode does not support [OpenMP](http://www.openmp.org/), but the latest version of LLVM does support it. The recommended way to install llvm is via [Homebrew](https://brew.sh/). After installing [Homebrew](https://brew.sh/), you should run `brew install llvm`.

#### Configure Xcode to Use LLVM
1. In `Build Settings`, press the large `+` button and select `Add User-Defined Setting`.
2. Enter `CC` for the key and `/usr/local/opt/llvm/bin/clang` for the value.
3. In `Build Settings`, press the large `+` button and select `Add User-Defined Setting`.

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Varoudis · July 29, 2017, 8:30am

Perfect Ill test!
Thanks

Varoudis · July 30, 2017, 12:00pm

@bakercp Im getting the error below.
for clarity I downloaded the 0.9.8 osx release and Im compuling the allAddonExample with the CC/CXX additions.

/usr/local/Cellar/llvm/4.0.1/include/c++/v1/cstddef:48:7: No member named ‘ptrdiff_t’ in the global namespace; did you mean ‘::ns_creeps::ptrdiff_t’?

/usr/local/Cellar/llvm/4.0.1/include/c++/v1/cstddef:53:7: No member named ‘max_align_t’ in the global namespace; did you mean ‘::ns_creeps::max_align_t’?

Any ideas?

bakercp · July 30, 2017, 3:41pm

I’m not sure … I have only tested it with the master branch, but I’m not sure that’s the problem.

Are you able to use the compiler outside of xcode to compile a simple openmp program?

Varoudis · August 1, 2017, 10:01am

yes. something is wrong with the ofxVectorGraphics.

EDIT: I forgot to say that the same problem happens on master too. Im now trying to get it in Linux maybe.