| undefined reference to `WinMain@16' [message #211325] |
Sat, 08 March 2008 04:01  |
Eclipse User |
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Originally posted by: malekm.centrum.cz
Hi,
I tried CDT instead VS, because i use Eclipse for java programming.
But if I test compile windows program, it appear error "undefined
reference to `WinMain@16'". Compiling console app is ok. I searched all
this forum and all links from Google, but nothing help me.
Here is simple example:
#include "windows.h"
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPWSTR lpCmdLine,
int nShowCmd)
{
MessageBox(NULL, TEXT("Ahoj svete!"), TEXT("Muj pokus"), MB_OK);
return 0;
}
Console list:
**** Internal Builder is used for build ****
g++ -O0 -g3 -Wall -c -fmessage-length=0 -osrc\AhojSvete.o
..\src\AhojSvete.cpp
..\src\AhojSvete.cpp:7:2: warning: no newline at end of file
g++ -oAhojSvete.exe src\AhojSvete.o
/mingw/lib/libmingw32.a(main.o):main.c:(.text+0x104): undefined reference
to `WinMain@16'
collect2: ld returned 1 exit status
Build error occurred, build is stopped
Time consumed: 2172 ms.
Running on Eclipse 3.3.1.1, CDT 4.0.3, MinGW-5.1.3, MSYS-1.0.10
Thanks for your help.
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| Re: undefined reference to `WinMain@16' [message #211414 is a reply to message #211325] |
Sun, 09 March 2008 11:49  |
| Eclipse User |
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Originally posted by: dschaefer.rogers.com
MG wrote:
> Hi,
> I tried CDT instead VS, because i use Eclipse for java programming.
>
> But if I test compile windows program, it appear error "undefined
> reference to `WinMain@16'". Compiling console app is ok. I searched all
> this forum and all links from Google, but nothing help me.
>
> Here is simple example:
>
> #include "windows.h"
>
> int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPWSTR
> lpCmdLine, int nShowCmd)
> {
> MessageBox(NULL, TEXT("Ahoj svete!"), TEXT("Muj pokus"), MB_OK);
> return 0;
> }
>
> Console list:
> **** Internal Builder is used for build ****
> g++ -O0 -g3 -Wall -c -fmessage-length=0 -osrc\AhojSvete.o
> .\src\AhojSvete.cpp
> .\src\AhojSvete.cpp:7:2: warning: no newline at end of file
> g++ -oAhojSvete.exe src\AhojSvete.o
> /mingw/lib/libmingw32.a(main.o):main.c:(.text+0x104): undefined
> reference to `WinMain@16'
> collect2: ld returned 1 exit status
> Build error occurred, build is stopped
> Time consumed: 2172 ms.
> Running on Eclipse 3.3.1.1, CDT 4.0.3, MinGW-5.1.3, MSYS-1.0.10
>
> Thanks for your help.
>
Believe it or not it's because you have declared the lpCmdLine to be
LPWSTR (wchar_t *) instead of LPSTR (char *). Since the signature
doesn't match, gcc doesn't do it's magic to ensure WinMain gets
generated correctly with the C++ compiler (i.e. without the name mangling).
If you want to use UNICODE you need to use wWinMain.
Doug.
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| Re: undefined reference to `WinMain@16' [message #211452 is a reply to message #211428] |
Sun, 09 March 2008 21:14 |
| Eclipse User |
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Originally posted by: dschaefer.rogers.com
MG wrote:
> You have absolute right. If I change the type to "LPSTR" and delete
> -mwindows from linker its work. And I dint have the second problem with
> "unrecognised emulation mode: windows".
>
> Many thanks for your advice.
>
The mingw is always -mwindows. You can't turn it off. I actually think
it's a cygwin specific option that doesn't exist in the mingw compiler.
Glad things worked for you.
Cheers,
Doug.
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