OpenACC 1.0 Support Merged For GCC Fortran
Written by Michael Larabel in Compiler on 13 March 2014 at 10:45 AM EDT. Add A Comment
Support for the OpenACC parallel programming standard for heterogeneous CPU/GPU systems has been added to GCC's Fortran compiler front-end.

As of this morning the GCC Fortran front-end supports the OpenACC 1.0 standard developed by Cray, NVIDIA, and other companies for simplified parallel programming on heterogeneous CPU/GPU platforms. The main benefit of OpenACC over OpenMP is the GPU support, but the GNU Compiler Collection doesn't yet have this capability.

Samsung has been one of the companies working on GCC Fortran support for OpenACC while Mentor Graphics / Code Sourcery in conjunction with NVIDIA have been working on OpenACC 2.0 for GCC with GPU support, which has been causing controversy since the announcement last year. The GPU support in the GCC compiler involves adding a NVIDIA PTX back-end to GCC while these other non-GPU OpenACC approaches involve implementing OpenACC via OpenMP.

With GCC's Revision 208533, the work led by Samsung for OpenACC 1.0 in Fortran has been merged. OpenACC itself comes mostly down to new programming directives and a new run-time library. The changes that landed are just support for the Fortran front-end and not any GCC back-ends or support for C or C++ with OpenACC.

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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter or contacted via

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