On: Rejuvenating the Microsoft C/C++ Compiler

[claudius]

This:

    ./clang++ --version
    clang version 3.8.0 (trunk 246030)
    Target: x86_64-unknown-linux-gnu
    Thread model: posix

does not support OpenMP to my knowledge.

[gopowerranger → claudius]

You have to enable it using -fopenmp

http://blog.llvm.org/2015/05/openmp-support_22.html

http://clang-omp.github.io/

[claudius → gopowerranger]

Hmm, interesting. It works in a simple test case, but fails to compile my codebase and throws an error

    ./inc/bla.h:163:9: error: unexpected '#pragma omp ...' in program [-Werror,-Wsource-uses-openmp]
    #pragma omp parallel for num_threads(Threading::num), schedule(dynamic, 1)

Unfortunately I wasn’t able to build a minimally failing example so far, I will have to investigate this further. Thanks for the heads-up in any case!

Edit: Turns out everything fails if -Weverything is supplied. I didn’t offer a runtime library (nor did the compiler define the _OPENMP macro even when having -fopenmp on the command line, otherwise it would have complained about a missing <omp.h>…). If -Weverything is not there, the thing compiles but only runs with one thread.