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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Gnat Version 4.5.4 v protected objects v tasking
Date: Tue, 23 Apr 2013 23:03:12 +0100
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Date: 2013-04-23T23:03:12+01:00
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stvcook53@gmail.com writes:

> Symptoms out of 4.5.4 relate to the tasking portion of the Ada
> run-time system, and relate to protected objects when located outside
> the main program.  Symptoms manifest as a silent hang when a program
> is run that includes the tasking portion of the runtime system.  The
> gdb debugger exhibits a SIGSEGV while in the run-time package
> System.Secondary_Stack.  Symptom occurs at the end of elaboration
> before control enters main program.  Please comment on sample code or
> planned, related Gnat updates.

No problems here on Mac OS X - x86_64 - with GNAT GPL 2011/2 or with FSF
4.8.0.

I don't see anything wrong with your code.

The symptoms sound as though the tasking part of the RTS isn't getting
initialised (or not properly, anyway).

I had related symptoms when I had a library that involved tasking and a
main program that didn't; you don't have a separate library, but could
you perhaps try linking with the static RTS vs linking with the dynamic
RTS? If you're using gnatmake, add "-bargs -static" or "-bargs -shared",
or if you're running gnatbind by hand it's "gnatbind -static" or
"gnatbind -shared".