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Date: Fri, 22 May 2015 11:35:58 -0700 (PDT)
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Subject: Problems with the "mwindows" switch
From: NiGHTS <nights@unku.us>
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Xref: news.eternal-september.org comp.lang.ada:25960
Date: 2015-05-22T11:35:58-07:00
List-Id: <comp.lang.ada>

I am trying to compile a GUI Windows application with Ada & Gtk in such a w=
ay as to only display the GUI window and not the console window. Early in m=
y development I had success using the "mwindows" linker switch with my GTK =
window, but had to remove this switch at some point during development afte=
r I was no longer able to test run the program without it aborting immediat=
ely after startup. I suspect the problem is a conflict with something I've =
added to the GPR project file.=20

In my program, the very first command it ever does is this:

Ada.Text_IO.Put_Line ("Hello World");

My expectation is that I would only see this "Hello World" message if I ran=
 the executable from a console window but not when run directly from Window=
s Explorer.

Unfortunately when the "mwindows" flag is set not only does the GUI not app=
ear as expected, but I don't get any feedback on the command console either=
. It makes me think that there is something fundamentally broken with the e=
xecutable itself.

Here is a limited view of my GPR project file:


with "gtkada";
with "gnatcoll_sqlite";

project main is

    ...

    package Builder is
        for Default_Switches ("ada") use (
            "-g"         -- Compile with Symbols for Debugging
        );
    end Builder;

    package Compiler is
        for Default_Switches ("ada") use (
            "-g",        -- Compile with Symbols for Debugging
            "-gnat05",   -- Use Ada 2005
            "-gnata"     -- Compile all Assertions and enable all runtime c=
hecks
        );
    end Compiler;

    package Linker is
        for Default_Switches ("ada") use (
            "-g",            -- Compile with Symbols for Debugging
            "-pthread",      -- Link with pthread support
            "-lusb_driver",  -- Driver imported from C
            "-mwindows"      -- Launch Window, not console (* breaks progra=
m *)
        );
    end Linker;

    ...

end main;


Any hints on what could be wrong is be highly appreciated!

Thank you.