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Newsgroups: comp.lang.ada
Date: Sun, 26 Dec 2021 22:19:27 -0800 (PST)
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Subject: Re: Big differences between gnatmake and gprbuild
From: Gautier write-only address <gautier_niouzes@hotmail.com>
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> I am using gnatmake 9.3.0 and gprbuild community edition 2021. The Ada executable from gnatmake is about 50% smaller than that of gprbuild and runs much slower than the gprbuild version. Is gnatmake deprecated, obsolete, or not maintained?

It looks like the compiler, linker & binder options that, in your case, gnatmake sends to GNAT, are different than those gprbuild sends, especially optimization options.
What are the command line options to gnatmake you are using ? And to gprbuild ?
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