The GOMP project has developed an implementation of OpenMP for the C, C++, and Fortran compilers in the GNU Compiler Collection and is further improving it. As part of the GNU Project, GOMP simplifies parallel programming for all GNU system variants. This effort operates in an open environment to attract developers and ensure applicability across multiple architectures and applications.
Traditionally, programmers have used architecture-specific methods to effectively program tightly-parallelized computers — high band-width clusters, SMP machines, or multi-core processors. Parallel programming has thus been a time-consuming and arcane task.
OpenMP offers a simple way of exploiting parallelism without interfering with algorithm design; an OpenMP program compiles and operates correctly in both parallel and serial execution environments. Using OpenMP's directive-based parallelism also simplifies the act of converting existing serial code to efficient parallel code.
OpenMP additionally permits to offload computations on accelerators such as GPUs, making use of their highly parallel computation support; if no accelarator is available, as fallback, the computation is then done on the host.
To remain relevant, free software development tools must support emerging technologies. By implementing OpenMP, GOMP provides a simplified syntax tools for creating software targeted at parallel architectures. OpenMP's platform-neutral syntax meshes well with the portability goals of GCC and other GNU projects.
The GOMP release includes a support library, libgomp, and extensions to target language parsers. A long-term goal is the generation of efficient and small code for OpenMP applications.
We encourage everyone to contribute changes and help test GOMP. GOMP has been merged into mainline GCC.
Please add "openmp" to the keywords field when filing a bug report.
libgomp, the GOMP support library, has online documentation available.
OpenMP Version 5.1 has been released.
OpenMP Technical Report 9: Version 5.1 Public Comment Draft has been released.
GCC 10 has been released; it adds a number of
newly implemented OpenMP 5.0 features on top of the GCC 9 release such as
conditional lastprivate clause, scan
and loop directives, order(concurrent) and
use_device_addr clauses support, if clause on
simd construct or partial support for the
declare variant directive, getting closer to full support
of the OpenMP 5.0 standard.
GCC 9 has been released and version 5.0 of the OpenMP specification is now partially supported in the C and C++ compilers. For details which features of OpenMP 5.0 are and which are not supported in the GCC 9 release see this mail.
The OpenMP v5.0 specification has been released.
GCC 7 has been released and version 4.5 of the OpenMP specification is now partially supported in the Fortran compiler; the largest missing item is structure element mapping.
GCC 6 has been released and version 4.5 of the OpenMP specification is now supported in the C and C++ compilers
The final OpenMP v4.5 specification has been released.
The gomp-4_1-branch has been merged into
mainline, so GCC 6 and later will feature OpenMP v4.5 support for
C and C++.
Fortran OpenMP v4.0 support has been backported to
gcc-4_9-branch and will be available in the upcoming
GCC 4.9.1 release.
The last major part of Fortran OpenMP v4.0 support has been committed into mainline.
The gomp-4_0-branch has been merged into
mainline, so GCC 4.9 and later will feature OpenMP v4.0 support for
C and C++.
The final OpenMP v4.0 specification has been released.
The gomp-3_1-branch has been merged into
mainline, so GCC 4.7 and later will feature OpenMP v3.1 support.
The final OpenMP v3.1 specification has been released.
A draft of the OpenMP v3.1 specification has been released for
public review. The gomp-3_1-branch branch has been
created and work began on implementing v3.1 support.
The gomp-3_0-branch has been merged into
mainline, so GCC 4.4 and later will feature OpenMP v3.0 support.
The final OpenMP v3.0 specification has been released.
Draft of the OpenMP v3.0 specification has been released for
public review, the gomp-3_0-branch branch has been
created and work began on implementing v3.0 support.
The branch has been merged into mainline, so starting with GCC 4.2 the compiler supports the OpenMP v2.5 specification.
The branch is ready to be merged into mainline. All three front ends are functional and there should not be many corners of the standard left to implement. There are 5 main modules to merge into mainline: (1) runtime library, (2) code generation, (3) C front end, (4) C++ front end, and, (5) Fortran front end.
The runtime library is functionally complete. The syntax parsers for C, C++ and Fortran are complete, though there are still dusty corners with respect to semantic translation to be resolved. Adventurous users who don't mind the compiler crashing on every other source file are encouraged to begin filing bugs.
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These pages are maintained by the GCC team. Last modified 2020-11-16.