Re: Linking

Keith Marshall <[email protected]> Tue, 2 Jun 2020 15:35:20 +0100
Newsgroups	gmane.comp.gnu.mingw.user
Organization	MinGW.org Project
Message-ID	<[email protected]>
On 02/06/2020 12:01, Peter Williams wrote:
> I am still unsure about your comment on my link command:
> 
> gcc -o x03.exe x03.o C:\plplot32\lib\libcsirocsa.a
>   C:\plplot32\lib\libplplot.a C:\plplot32\lib\libqsastime.a
>   -mconsole -mwindows -lm

You are specifying -lm, which, although not contentious, is utterly
useless; in MinGW, it does nothing whatsoever.

You are specifying both -mconsole and -mwindows, the primary purpose of
each of which, according to the GCC manual, is to set a PE header flag
to identify your application as either a console application, (which is
the default), or as a GUI application; it can be one or the other; it
cannot be both.

Inspection of the GCC specs does indicate a side effect of -mwindows: it
causes two additional libraries -- -lgdi32 -lcomdlg32 -- to be included
in the list automatically passed to the linker; maybe, if you really do
need the PE header to target your application to the console subsystem,
but you still need to link with those libraries, you should specify them
explicitly, instead of specifying two conflicting options?

Alternatively, if your application's interface is primarily GUI, then
you should specify -mwindows, and use the Windows Console API to gain
access to properly initialized console services, when you need them,
rather than depending on you application being invoked from a console?

-- 
Regards,
Keith.

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