This page contains information on GCC's implementation of the OpenMP specification and related functionality like the auto parallelizer (-ftree-parallelize-loops).

As of GCC 4.2, the compiler implements version 2.5 of the OpenMP specification, as of 4.4 it implements version 3.0 and since GCC 4.7 it supports the OpenMP 3.1 specification. GCC 4.9 supports OpenMP 4.0 with the follow exceptions (as of 2013-11-28): The new 4.0 directives are not yet supported in Fortran and omp target will always run on the host. (For omp target see also on-going work in the branches gomp-4_0-branch and openacc-1_0-branch.)

OpenMP Documentation

Automatic Parallelization


Test Suites and Benchmarks


Feel free to add new items to this list as you run into issues or features that would be interesting to add. Send mail to the list and/or the GCC OpenMP maintainers if any item in this list sounds interesting but is hard to understand.