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Date: Thu, 13 Dec 2012 14:08:37 +0100
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Subject: Re: A linking problem with current GCC (4.5.3)
From: =?UTF-8?Q?V=C3=A1clav_Zeman?= <vhaisman AT gmail DOT com>
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On 12 December 2012 22:50, Angelo Graziosi wrote:
> When Cygwin had GCC-4.3.4 as GCC default compiler, I could compile an
> application with these steps
>
>
> g++ -c winbgim.cpp -o winbgim-g95.o
>
> g95 -O3 -Wall -mwindows basic_mods.f90 f03bgi.f90 f03eyes.f90 \
>   winbgim-g95bis.o  -L /lib/gcc/i686-pc-cygwin/4.5.3 -lstdc++ \
>   -s -o f03eyes-g95
>
>
> Now, with GCC 4.5.3, I see linker errors:
>
>
> g++ -c winbgim.cpp -o winbgim-g95.o
>
> g95 -O3 -Wall -mwindows basic_mods.f90 f03bgi.f90 f03eyes.f90 \
>   winbgim-g95.o  -L /lib/gcc/i686-pc-cygwin/4.5.3 -lstdc++ \
>   -s -o f03eyes-g95
> /lib///libcygwin.a(_cygwin_crt0_common.o):_cygwin_crt0_common.cc:(.data+0x4):
> undefined reference to `__real__Znaj'
> /lib///libcygwin.a(_cygwin_crt0_common.o):_cygwin_crt0_common.cc:(.data+0xc):
> undefined reference to `__real__ZdaPv'
>
>
> (Notice that I have used the right PATH /lib/gcc/i686-pc-cygwin/4.5.3...)
>
> But if I compile winbgim.cpp with g++-3,
>
> g++-3 -c winbgim.cpp -o winbgim-g95.o
>
> g95 -O3 -Wall -mwindows basic_mods.f90 f03bgi.f90 f03eyes.f90 \
>   winbgim-g95.o  -L /lib/gcc/i686-pc-cygwin/4.5.3 -lstdc++ \
>   -s -o f03eyes-g95
>
> it works! It also works if I use an old winbgim-g95.o compiled with
> gcc-4.3.4...
>
>
> It seems I need to add some other library to command line...
If you are targeting native Windows (no Cygwin) then you can use
i686-w64-mingw32-gfortran and i686-w64-mingw32-g++ as replacements for
g++ and g95 commands. You will have to install the appropriate MinGW
related packages, though.

-- 
VZ

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