: For the German Naval Acoustic Torpedo see G7es .

GNAT is the GNU Ada programming language Compiler based on GNU Compiler Collection. Originally its name was an acronym that stood for GNU NYU Ada Translator , but nowadays it does not have any meaning. The front-end and runtime are written in Ada, and are licensed using the General Public License.

The project started in 1992 when the US Air Force awarded the New York University a contract to build an open source compiler for Ada to help with the Ada 9X standardization process. The contract required the use of the GNU General Public License for all developments. In 1994 a company named Ada Core Technologies (renamed as AdaCore at the end of 2004) was founded to provide continuing development and commercial support of GNAT. The first official validation of GNAT happened in 1995.

GNAT was initially released separately from the main GCC sources. On October 2, 2001 the GNAT sources were contributed to the GCC Concurrent Versions System repository. The last version to be released separately was GNAT 3.15p, based on GCC 2.8.1, on October 2, 2002. Starting with GCC 3.4, on major platforms the official GCC release is able to pass 100% of the ACATS Ada tests included in the GCC testsuite. In GCC 4.0, more exotic platforms are also able to pass 100% of ACATS.

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