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From: "Alejandro R. Mosteo" <alejandro@mosteo.com>
Newsgroups: comp.lang.ada
Subject: Re: Teaching C/C++ from Ada perspective?
Date: Mon, 9 Jul 2018 11:04:06 +0200
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Xref: reader02.eternal-september.org comp.lang.ada:53741
Date: 2018-07-09T11:04:06+02:00
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On 08/07/2018 22:00, Maciej Sobczak wrote:
>> I do agree, but GNAT has become quite good about warning of "can move
>> with to body",
> 
> It did not warn me with the trivial and obvious (empty P!) code example that I have presented. Is there some compiler switch that makes GNAT more sensitive to such abuses?

This is what I'm using currently and it warns about all unneeded withs:

for Switches ("ada") use
  ("-gnatVa", "-gnatwa", "-g", "-O2", "-gnato",
   "-fstack-check", "-gnata", "-gnat12");

It's only with Community 2018 that I've started seeing the "use clause 
has no effect".