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I see. When you use AdaCore's free GNAT compiler, it will link to the standard library which is licensed under GPLv3. This means in order to distribute your software binary that is linked with the standard library, your software license must be compatible with the standard library GPLv3 license. The difference with GNU's GCC is that GCC provides an exception: the GCC RUNTIME LIBRARY EXCEPTION https://www.gnu.org/licenses/gcc-exception-3.1.html