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Old 01-02-2006, 10:23 PM   #16
lucky6969b
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ok brainwash
gcc can't link C++ modules at link time
g++ can't accept read and write API when the function they reside in is C e.g.
int do_somthing(void)
{
read(...);
}

Thanks
Jack
 
Old 01-02-2006, 10:42 PM   #17
lucky6969b
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Hi,
I can now use this to compile
gcc -o test test.cpp -lstdc++

How do I make autoconf discard g++ and use gcc?
Does anyone know the name of the Macro specified to configure.in?
Thanks
Jack
 
Old 01-03-2006, 02:01 AM   #18
lucky6969b
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After a day of juggling, I squeezed everything into one error
#include <X11/Xlib.h> <---- not found

I have setup the path in Makefile.am

$INCLUDES=-I$/opt/.... -$I/usr/X11R6/include

the file exist from that folder
Xlib.h


and only cross-compilation had this error, local PC Compilation was fine.

Anything I'm missing here?
Anyone? Paul?
Thanks
Jack
 
Old 01-03-2006, 10:20 PM   #19
lucky6969b
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Even in PC Linux mode, Xlib.h wasn't recognised.
I assume that I have to rename the extension from cpp to c which was what I did for other modules. Any comments?
Thanks
Jack
 
Old 01-03-2006, 11:16 PM   #20
mhcox
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Quote:
Originally Posted by lucky6969b
After a day of juggling, I squeezed everything into one error
#include <X11/Xlib.h> <---- not found

I have setup the path in Makefile.am

$INCLUDES=-I/opt/.... -I/usr/X11R6/include

the file exist from that folder
Xlib.h


and only cross-compilation had this error, local PC Compilation was fine.

Anything I'm missing here?
Anyone? Paul?
Thanks
Jack
I'm not that familiar with automake/autoconfig, but my guess is that:

$INCLUDES=-I$/opt/.... -$I/usr/X11R6/include

should be:

INCLUDES=-I/opt/.... -I/usr/X11R6/include
Last edited by mhcox; 01-03-2006 at 11:19 PM.
 
Old 01-04-2006, 12:21 AM   #21
lucky6969b
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Mike Thanks for your kind reply.
I now got link time error against libjpeg
Thanks
Jack
 
Old 01-04-2006, 12:23 AM   #22
lucky6969b
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And #include <X11/Xlib.h>
still cause errors
If I comment it out, I don't have any compilation error
just link time error
Thanks
Jack
 
Old 01-04-2006, 12:28 AM   #23
mhcox
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Quote:
Originally Posted by lucky6969b
And #include <X11/Xlib.h>
still cause errors
If I comment it out, I don't have any compilation error
just link time error
Thanks
Jack
What are the compilation/link error messages now?
 
Old 01-04-2006, 02:05 AM   #24
lucky6969b
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just can't get functions like jpeg_decompress... to link
Thanks
Jack
 
Old 01-04-2006, 08:39 PM   #25
mhcox
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I repeat...

What are the compilation/link error messages now?

Also, is the library a C or C++ library? I assume it's C, since you mentioned only one function. Take a look at the headers that declare the functions. Is the header file "C++ aware", i.e. conditionally compiles 'extern "C"' blocks if the header is being compiled by a C++ compiler? If not, you'll have to put

extern "C"
{
#include "whatever_header.h"
}

In your code.
 
Old 01-04-2006, 08:51 PM   #26
lucky6969b
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Webcam.o(.text+0x2c):/opt/arcom/armbe-linux/include/c++/3.4.2/bits/basic_string.h:1983: undefined reference to 'jpeg_CreateDecompress(jpeg_decompress_struct*, int, unsigned int)'

etc...
 
  


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