Re: [Mingw-users] error in compiling opencv 2.1 with gcc 4.5.0

[Cesar S. <ces...@gm...>]

On 13/5/2010 07:14, zwz wrote:
> [ 0%] Generating precomp.hpp.gch/opencv_imgproc_Release.gch
> d:/gnu/mingw/bin/../lib/gcc/mingw32/4.5.0/../../../libmingw32.a(main.o):main.c:(.text+0xd2):
> undefined reference to `WinMain@16'
> collect2: ld returned 1 exit status
>

Could you show the full gcc command line?

When generating a precompiled header, please make sure you do not have 
any linker flag on the command line or, if you do, use it together with 
-c. Example:

$ echo "extern int i;" > pch.h

$ gcc pch.h

(Success)

$ gcc -Wl,--enable-auto-import pch.h

c:/mingw/bin/../lib/gcc/mingw32/4.5.0/../../../libmingw32.a(main.o):main.c:(.text+0xd2): 
undefined reference to `WinMain@16'
collect2: ld returned 1 exit status

(Failure)

$ gcc -Wl,--enable-auto-import -c pch.h

(Success again)

Regards,
Cesar