dev-cpp-users

[Dev-C++] Problem with libjpeg in Dev C++

[<lis...@da...>]

Hello dev-cpp-users,

  I  want  to  compile  code  from  an OpenGL tutorial that uses libjpeg to read
  textures from a jpeg file. Unfortunatly, whenever I try to compile the code, I
  get linker errors for all libjpeg functions. (I use the -ljpeg parameter.)

  I  searched the Dev C++ forums and a lot of other people seem to have the same
  problem,  but none of them received a helpful reply. Maybe somebody here knows
  a sollution ?

Thanks,
 Dennis

Re: [Dev-C++] Problem with libjpeg in Dev C++

[<or...@vp...>]

Dennis Möhlmann wrote:
> Hello dev-cpp-users,
> 
>   I  want  to  compile  code  from  an OpenGL tutorial that uses libjpeg to read
>   textures from a jpeg file. Unfortunatly, whenever I try to compile the code, I
>   get linker errors for all libjpeg functions. (I use the -ljpeg parameter.)
> 
>   I  searched the Dev C++ forums and a lot of other people seem to have the same
>   problem,  but none of them received a helpful reply. Maybe somebody here knows
>   a sollution ?

Yes, I know the solution.
But I'll keep it a secret, until you tell me the errors you get. ;)

--
Greetings,
   Balázs

Re[2]: [Dev-C++] Problem with libjpeg in Dev C++

[<lis...@da...>]

Oops,  didn't  know the linker can any other error messages than this one (never
received a different error so far...)

(hope this doesn't get wrapped...)

g++.exe ../_obj/BlackMagic3D.o ../_obj/world.o ../_obj/entity.o ../_obj/engine.o ../_obj/model.o ../_obj/winmsg.o ../_obj/viewport.o ../_obj/keyboard.o ../_obj/renderer.o ../_obj/image.o  -o "..\_exe\BlackMagic3D.exe" -L"C:/Programme/Dev-Cpp/lib" -mwindows -lopengl32 -lglu32 -lglaux -lwinmm -ljpeg

../_obj/image.o(.text+0x68e):image.cpp: undefined reference to `jpeg_std_error(jpeg_error_mgr*)'
../_obj/image.o(.text+0x6ad):image.cpp: undefined reference to `jpeg_CreateDecompress(jpeg_decompress_struct*, int, unsigned)'
../_obj/image.o(.text+0x6c2):image.cpp: undefined reference to `jpeg_stdio_src(jpeg_decompress_struct*, _iobuf*)'
../_obj/image.o(.text+0x6d6):image.cpp: undefined reference to `jpeg_read_header(jpeg_decompress_struct*, int)'
../_obj/image.o(.text+0x6e8):image.cpp: undefined reference to `jpeg_start_decompress(jpeg_decompress_struct*)'
../_obj/image.o(.text+0x7f0):image.cpp: undefined reference to `jpeg_read_scanlines(jpeg_decompress_struct*, unsigned char**, unsigned)'
../_obj/image.o(.text+0x828):image.cpp: undefined reference to `jpeg_finish_decompress(jpeg_decompress_struct*)'
../_obj/image.o(.text+0x83a):image.cpp: undefined reference to `jpeg_destroy_decompress(jpeg_decompress_struct*)'


Your Message: (Saturday, August 02, 2003, 9:20:42 PM)

OB> Dennis Möhlmann wrote:
>> Hello dev-cpp-users,
>> 
>>   I  want  to  compile  code  from  an OpenGL tutorial that uses libjpeg to read
>>   textures from a jpeg file. Unfortunatly, whenever I try to compile the code, I
>>   get linker errors for all libjpeg functions. (I use the -ljpeg parameter.)
>> 
>>   I  searched the Dev C++ forums and a lot of other people seem to have the same
>>   problem,  but none of them received a helpful reply. Maybe somebody here knows
>>   a sollution ?

OB> Yes, I know the solution.
OB> But I'll keep it a secret, until you tell me the errors you get. ;)

OB> --
OB> Greetings,
OB>    Balázs

-- 
Best regards,
 Dennis                            mailto:lis...@da...

Re: [Dev-C++] Problem with libjpeg in Dev C++

[<or...@vp...>]

Dennis Möhlmann wrote:

> Oops,  didn't  know the linker can any other error messages than this one (never
> received a different error so far...)
> 
> (hope this doesn't get wrapped...)
> 
> g++.exe ../_obj/BlackMagic3D.o ../_obj/world.o ../_obj/entity.o ../_obj/engine.o ../_obj/model.o ../_obj/winmsg.o ../_obj/viewport.o ../_obj/keyboard.o ../_obj/renderer.o ../_obj/image.o  -o "..\_exe\BlackMagic3D.exe" -L"C:/Programme/Dev-Cpp/lib" -mwindows -lopengl32 -lglu32 -lglaux -lwinmm -ljpeg
> 
> ../_obj/image.o(.text+0x68e):image.cpp: undefined reference to `jpeg_std_error(jpeg_error_mgr*)'
> ../_obj/image.o(.text+0x6ad):image.cpp: undefined reference to `jpeg_CreateDecompress(jpeg_decompress_struct*, int, unsigned)'
> ../_obj/image.o(.text+0x6c2):image.cpp: undefined reference to `jpeg_stdio_src(jpeg_decompress_struct*, _iobuf*)'
> ../_obj/image.o(.text+0x6d6):image.cpp: undefined reference to `jpeg_read_header(jpeg_decompress_struct*, int)'
> ../_obj/image.o(.text+0x6e8):image.cpp: undefined reference to `jpeg_start_decompress(jpeg_decompress_struct*)'
> ../_obj/image.o(.text+0x7f0):image.cpp: undefined reference to `jpeg_read_scanlines(jpeg_decompress_struct*, unsigned char**, unsigned)'
> ../_obj/image.o(.text+0x828):image.cpp: undefined reference to `jpeg_finish_decompress(jpeg_decompress_struct*)'
> ../_obj/image.o(.text+0x83a):image.cpp: undefined reference to `jpeg_destroy_decompress(jpeg_decompress_struct*)'

Well, it sais, it has undefined references of jpeg functions.
I have no idea though why it has them, as the jpeg library has these 
functions.
Maybe you should try to recompile the jpeg library from the code.

--
Greetings,
   Balázs

Re[2]: [Dev-C++] Problem with libjpeg in Dev C++

[<lis...@da...>]

I will try that, once I find the sources...

Thanks for your reply!

Your Message: (Sunday, August 03, 2003, 10:51:28 AM)

OB> Dennis Möhlmann wrote:

>> Oops,  didn't  know the linker can any other error messages than this one (never
>> received a different error so far...)
>> 
>> (hope this doesn't get wrapped...)
>> 
>> g++.exe ../_obj/BlackMagic3D.o ../_obj/world.o ../_obj/entity.o ../_obj/engine.o ../_obj/model.o ../_obj/winmsg.o ../_obj/viewport.o ../_obj/keyboard.o ../_obj/renderer.o ../_obj/image.o  -o
>> "..\_exe\BlackMagic3D.exe" -L"C:/Programme/Dev-Cpp/lib" -mwindows -lopengl32 -lglu32 -lglaux -lwinmm -ljpeg
>> 
>> ../_obj/image.o(.text+0x68e):image.cpp: undefined reference to `jpeg_std_error(jpeg_error_mgr*)'
>> ../_obj/image.o(.text+0x6ad):image.cpp: undefined reference to `jpeg_CreateDecompress(jpeg_decompress_struct*, int, unsigned)'
>> ../_obj/image.o(.text+0x6c2):image.cpp: undefined reference to `jpeg_stdio_src(jpeg_decompress_struct*, _iobuf*)'
>> ../_obj/image.o(.text+0x6d6):image.cpp: undefined reference to `jpeg_read_header(jpeg_decompress_struct*, int)'
>> ../_obj/image.o(.text+0x6e8):image.cpp: undefined reference to `jpeg_start_decompress(jpeg_decompress_struct*)'
>> ../_obj/image.o(.text+0x7f0):image.cpp: undefined reference to `jpeg_read_scanlines(jpeg_decompress_struct*, unsigned char**, unsigned)'
>> ../_obj/image.o(.text+0x828):image.cpp: undefined reference to `jpeg_finish_decompress(jpeg_decompress_struct*)'
>> ../_obj/image.o(.text+0x83a):image.cpp: undefined reference to `jpeg_destroy_decompress(jpeg_decompress_struct*)'

OB> Well, it sais, it has undefined references of jpeg functions.
OB> I have no idea though why it has them, as the jpeg library has these 
OB> functions.
OB> Maybe you should try to recompile the jpeg library from the code.

OB> --
OB> Greetings,
OB>    Balázs

-- 
Best regards,
 Dennis                            mailto:lis...@da...

Re[2]: [Dev-C++] Problem with libjpeg in Dev C++

[Per W. <pw...@ia...>]

Are you compiling a c++ program? The jpeg library is in C. Did you
remember to specify
extern "C" {
#include xxx
}

when including the jpeg include files?

As you can see, the linker doesn't just complain about
missing symbol _jpeg_std_error, but actually knows about what parameter
types the function takes. This is because your source code is trying to
call the jpeg functions in C++ mode, i.e. with name-mangled external
references.

/Per W

> Thanks for your reply!
>
> Your Message: (Sunday, August 03, 2003, 10:51:28 AM)
>
> OB> Dennis M=F6hlmann wrote:
>
> >> Oops,  didn't  know the linker can any other error messages than this =
one (never
> >> received a different error so far...)
> >>
> >> (hope this doesn't get wrapped...)
> >>
> >> g++.exe ../_obj/BlackMagic3D.o ../_obj/world.o ../_obj/entity.o ../_ob=
j/engine.o ../_obj/model.o ../_obj/winmsg.o ../_obj/viewport.o ../_obj/keyb=
oard.o ../_obj/renderer.o ../_obj/image.o  -o
> >> "..\_exe\BlackMagic3D.exe" -L"C:/Programme/Dev-Cpp/lib" -mwindows -lop=
engl32 -lglu32 -lglaux -lwinmm -ljpeg
> >>
> >> ../_obj/image.o(.text+0x68e):image.cpp: undefined reference to `jpeg_s=
td_error(jpeg_error_mgr*)'
> >> ../_obj/image.o(.text+0x6ad):image.cpp: undefined reference to `jpeg_C=
reateDecompress(jpeg_decompress_struct*, int, unsigned)'
> >> ../_obj/image.o(.text+0x6c2):image.cpp: undefined reference to `jpeg_s=
tdio_src(jpeg_decompress_struct*, _iobuf*)'
> >> ../_obj/image.o(.text+0x6d6):image.cpp: undefined reference to `jpeg_r=
ead_header(jpeg_decompress_struct*, int)'
> >> ../_obj/image.o(.text+0x6e8):image.cpp: undefined reference to `jpeg_s=
tart_decompress(jpeg_decompress_struct*)'
> >> ../_obj/image.o(.text+0x7f0):image.cpp: undefined reference to `jpeg_r=
ead_scanlines(jpeg_decompress_struct*, unsigned char**, unsigned)'
> >> ../_obj/image.o(.text+0x828):image.cpp: undefined reference to `jpeg_f=
inish_decompress(jpeg_decompress_struct*)'
> >> ../_obj/image.o(.text+0x83a):image.cpp: undefined reference to `jpeg_d=
estroy_decompress(jpeg_decompress_struct*)'
>
> OB> Well, it sais, it has undefined references of jpeg functions.
> OB> I have no idea though why it has them, as the jpeg library has these
> OB> functions.
> OB> Maybe you should try to recompile the jpeg library from the code.
>
> OB> --
> OB> Greetings,
> OB>    Bal=E1zs
>
> --
> Best regards,
>  Dennis                            mailto:lis...@da...
>
>
>
>
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Re[3]: [Dev-C++] Problem with libjpeg in Dev C++

[<lis...@da...>]

Hello dev-cpp-users; hello Per,

  thanks  for  your  reply! I didn't even know about extern (newbie at work ;)),
  but now that I added it, everything works perfectly fine. Thanks again!
  

Your Message: (Wednesday, August 06, 2003, 1:29:05 PM)

PW> Are you compiling a c++ program? The jpeg library is in C. Did you
PW> remember to specify
PW> extern "C" {
PW> #include xxx
PW> }

PW> when including the jpeg include files?

PW> As you can see, the linker doesn't just complain about
PW> missing symbol _jpeg_std_error, but actually knows about what parameter
PW> types the function takes. This is because your source code is trying to
PW> call the jpeg functions in C++ mode, i.e. with name-mangled external
PW> references.

PW> /Per W

>> Thanks for your reply!
>>
>> Your Message: (Sunday, August 03, 2003, 10:51:28 AM)
>>
>> OB> Dennis Möhlmann wrote:
>>
>> >> Oops,  didn't  know the linker can any other error messages than this one (never
>> >> received a different error so far...)
>> >>
>> >> (hope this doesn't get wrapped...)
>> >>
>> >> g++.exe ../_obj/BlackMagic3D.o ../_obj/world.o ../_obj/entity.o ../_obj/engine.o ../_obj/model.o ../_obj/winmsg.o ../_obj/viewport.o ../_obj/keyboard.o ../_obj/renderer.o ../_obj/image.o  -o
>> >> "..\_exe\BlackMagic3D.exe" -L"C:/Programme/Dev-Cpp/lib" -mwindows -lopengl32 -lglu32 -lglaux -lwinmm -ljpeg
>> >>
>> >> ../_obj/image.o(.text+0x68e):image.cpp: undefined reference to `jpeg_std_error(jpeg_error_mgr*)'
>> >> ../_obj/image.o(.text+0x6ad):image.cpp: undefined reference to `jpeg_CreateDecompress(jpeg_decompress_struct*, int, unsigned)'
>> >> ../_obj/image.o(.text+0x6c2):image.cpp: undefined reference to `jpeg_stdio_src(jpeg_decompress_struct*, _iobuf*)'
>> >> ../_obj/image.o(.text+0x6d6):image.cpp: undefined reference to `jpeg_read_header(jpeg_decompress_struct*, int)'
>> >> ../_obj/image.o(.text+0x6e8):image.cpp: undefined reference to `jpeg_start_decompress(jpeg_decompress_struct*)'
>> >> ../_obj/image.o(.text+0x7f0):image.cpp: undefined reference to `jpeg_read_scanlines(jpeg_decompress_struct*, unsigned char**, unsigned)'
>> >> ../_obj/image.o(.text+0x828):image.cpp: undefined reference to `jpeg_finish_decompress(jpeg_decompress_struct*)'
>> >> ../_obj/image.o(.text+0x83a):image.cpp: undefined reference to `jpeg_destroy_decompress(jpeg_decompress_struct*)'
>>
>> OB> Well, it sais, it has undefined references of jpeg functions.
>> OB> I have no idea though why it has them, as the jpeg library has these
>> OB> functions.
>> OB> Maybe you should try to recompile the jpeg library from the code.
>>
>> OB> --
>> OB> Greetings,
>> OB>    Balázs
>>
>> --
>> Best regards,
>>  Dennis                            mailto:lis...@da...


-- 
Best regards,
 Dennis                            mailto:lis...@da...