Use of own C functions with Qt projects

[W. Tasin]

Fabrizio Santini wrote:
> 
> Hi,
> I need to use some my C function in a Qt project.
> But when I try to include and build them, the compiler
> answers:
> 
> gcc -DHAVE_CONFIG_H -I. -I. -I.. -I/usr/lib/qt/include
> -I/usr/X11R6/include     -O0 -g3 -Wall    -c plates.c
> /bin/sh ../libtool --mode=link g++  -O0 -g3 -Wall      -o plates4linux
> -L/usr/X11R6/lib   plates.o neural.o imageproc.o debug.o
> plates4linuxview.o plates4linux.o main.o plates4linuxview.moc.o
> plates4linux.moc.o  -lqt -lXext -lX11
> g++ -O0 -g3 -Wall -o plates4linux plates.o neural.o imageproc.o debug.o
> plates4linuxview.o plates4linux.o main.o plates4linuxview.moc.o
> plates4linux.moc.o  -L/usr/X11R6/lib -lqt -lXext -lX11
> plates4linux.o: In function `Plates4Linux::_RunPlatesRecognition(void)':
> /home/fabrizio/projects/plates4linux/plates4linux/plates4linux.cpp:340:
> undefined reference to `B(void)'
> /home/fabrizio/projects/plates4linux/plates4linux/plates4linux.cpp:340:
> undefined reference to `B(void)'
> collect2: ld returned 1 exit status
> make: *** [plates4linux] Error 1
> *** failed ***
> 
> where B is the C function declared in a <file>.c with <header>.h as
> 
> int B(void);
> 
> Can you help me?

Hi,

did you declared the follow in your header?
-----

#ifdef __cplusplus
extern "C" {
#endif

int B(void);

#ifdef __cplusplus
}
#endif

-----

Ciao

Walter
> 
> -- Fabrizio Santini
> 
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