Re: [Mingw-users] MingW linker warning about auto-importing

[Edward D. <eld...@tr...>]

On 9/27/2010 10:33 AM, JonY wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 9/27/2010 13:29, Edward Diener wrote:
>> Using MingW with gcc 4.5.0-1 the linker gives me the message:
>>
>> "c:/utilities/mingwcurrent/bin/../lib/gcc/mingw32/4.5.0/../../../../mingw32/bin/ld.exe:
>> warning: auto-importing has been activated without --enable-auto-import
>> specified on the command line.This should work unless it involves
>> constant data structures referencing symbols from auto-imported DLLs."
>>
>> I am not aware of doing anything to activate auto-importing in my gcc
>> command line, which automatically invokeds the linker since I am not
>> using the -c option.
>>
>> How do i get rid of this warning message ?
>>
>
> Hi,
>
> You should use proper dllimport attributes with your codes, but if you
> are lazy, you can just add -Wl,--enable-auto-import when linking.

My experience with __declspec(dllimport) with VC++ is that a header file 
automatically dllimports whatever is necessary when using a dll. Thta is 
why I am not used to doing it manually.

In my simple code, where the warning is occurring, I am only using C++ 
standard library functionality and no 3rd party libraries.

Adding -Wl,--enable-auto-import removed the warning.

>
> With the latter, you may run afoul if you have data dllimported, I'm not
> too clear what else you may encounter.
>
> With a recent binutils from cvs (2.20.51 series), you can safely ignore
> this warning.

Good, I am using binutils 2.20.51.

>
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2.0.16 (MingW32)
>
> iEYEARECAAYFAkygq0YACgkQp56AKe10wHe6ugCggT94REOSVnBt4A+EvyR8jD+b
> D4QAni4+EIcY9oFF5YABkNNc7YggM7fC
> =F8/r
> -----END PGP SIGNATURE-----
>
> ------------------------------------------------------------------------------
> Start uncovering the many advantages of virtual appliances
> and start using them to simplify application deployment and
> accelerate your shift to cloud computing.
> http://p.sf.net/sfu/novell-sfdev2dev
> _______________________________________________
> MinGW-users mailing list
> Min...@li...
>
> This list observes the Etiquette found at
> http://www.mingw.org/Mailing_Lists.
> We ask that you be polite and do the same.  Disregard for the list etiquette may cause your account to be moderated.
>
> _______________________________________________
> You may change your MinGW Account Options or unsubscribe at:
> https://lists.sourceforge.net/lists/listinfo/mingw-users
>