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: The new 4.0 directives are not yet supported in Fortran and omp target will always run on the host. GCC 4.10 added OpenMP 4.0 support to gfortran. (For actual offloading and for OpenACC see also the on-going work in the gomp-4_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.