Several Linker error: Undefined reference to

[enrique]

Hi everybody,
I'm trying to create a DLL to use the compression/decompression functions from a Delphi program. Basicly I created 2 "export" functions and copied the source of the dcmcjpeg and dcmdjpeg applications in the respective function. Before that, I build the required libraries:ofstd, dcmdata, dcmimgle, dcmimage, dcmjpeg, libijg8, libijg12 and libijg16. No errors reported in that steps. But, when I trying to build the DLL, I get several linker errors. The following is the compiller's log:

Compilador: Default compiler
Building Makefile: "C:\Prog\Dicom\dll\Makefile.win"
Executando make...
make.exe -f "C:\Prog\Dicom\dll\Makefile.win" all
dllwrap.exe --output-def liblibdcmcjpeg.def --driver-name c++ --implib liblibdcmcjpeg.a dllmain.o -L"C:/Dev-Cpp/lib" --no-export-all-symbols --add-stdcall-alias ../dcmjpeg/dcmjpeg.a ../dcmdata/dcmdata.a ../dcmimage/dcmimage.a ../dcmimgle/dcmimgle.a ../ofstd/libofstd.a ../../../Dev-Cpp/lib/libnetapi32.a ../../../Dev-Cpp/lib/libwsock32.a -o libdcmcjpeg.dll

../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0xf4b): undefined reference to `jpeg8_std_error'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0xfb5): undefined reference to `jpeg8_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1092): undefined reference to `jpeg8_CreateCompress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1102): undefined reference to `jpeg8_set_defaults'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x112c): undefined reference to `jpeg8_set_colorspace'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x119b): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x11cb): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x11fb): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1236): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1244): undefined reference to `jpeg8_simple_progression'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1272): undefined reference to `jpeg8_simple_lossless'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x13c8): undefined reference to `jpeg8_start_compress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1427): undefined reference to `jpeg8_write_scanlines'

../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1441): undefined reference to `jpeg8_finish_compress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x144f): undefined reference to `jpeg8_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0xf57): undefined reference to `jpeg12_std_error'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0xfc1): undefined reference to `jpeg12_destroy_compress'

../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x109e): undefined reference to `jpeg12_CreateCompress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x110e): undefined reference to `jpeg12_set_defaults'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1138): undefined reference to `jpeg12_set_colorspace'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x119a): undefined reference to `jpeg12_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x11ca): undefined reference to `jpeg12_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1205): undefined reference to `jpeg12_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1213): undefined reference to `jpeg12_simple_progression'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1241): undefined reference to `jpeg12_simple_lossless'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1397): undefined reference to `jpeg12_start_compress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x13f8): undefined reference to `jpeg12_write_scanlines'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1412): undefined reference to `jpeg12_finish_compress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1420): undefined reference to `jpeg12_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x7db): undefined reference to `jpeg16_std_error'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x845): undefined reference to `jpeg16_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x913): undefined reference to `jpeg16_CreateCompress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x983): undefined reference to `jpeg16_set_defaults'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x9ad): undefined reference to `jpeg16_set_colorspace'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x9f0): undefined reference to `jpeg16_simple_lossless'

../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xc17): undefined reference to `jpeg16_start_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xc78): undefined reference to `jpeg16_write_scanlines'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xc92): undefined reference to `jpeg16_finish_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xca0): undefined reference to `jpeg16_destroy_compress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x704): undefined reference to `jpeg8_resync_to_restart'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x7a7): undefined reference to `jpeg8_std_error'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x925): undefined reference to `jpeg8_CreateDecompress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x9ab): undefined reference to `jpeg8_destroy_decompress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xbc2): undefined reference to `jpeg8_read_header'

../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xd8c): undefined reference to `jpeg8_start_decompress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xef4): undefined reference to `jpeg8_read_scanlines'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xf76): undefined reference to `jpeg8_finish_decompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x704): undefined reference to `jpeg12_resync_to_restart'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x7a7): undefined reference to `jpeg12_std_error'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x925): undefined reference to `jpeg12_CreateDecompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x9ab): undefined reference to `jpeg12_destroy_decompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xbc2): undefined reference to `jpeg12_read_header'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xd8c): undefined reference to `jpeg12_start_decompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xef8): undefined reference to `jpeg12_read_scanlines'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xf7a): undefined reference to `jpeg12_finish_decompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x704): undefined reference to `jpeg16_resync_to_restart'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x7a7): undefined reference to `jpeg16_std_error'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x925): undefined reference to `jpeg16_CreateDecompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x9ab): undefined reference to `jpeg16_destroy_decompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xbc2): undefined reference to `jpeg16_read_header'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xd8c): undefined reference to `jpeg16_start_decompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xef8): undefined reference to `jpeg16_read_scanlines'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xf7a): undefined reference to `jpeg16_finish_decompress'
collect2: ld returned 1 exit status

dllwrap.exe: no export definition file provided.
Creating one, but that may not be what you want
dllwrap.exe: c++ exited with status 1

make.exe: *** [libdcmcjpeg.dll] Error 1

Execução terminada

[enrique]

btw, I'm using Dev-cpp with MinGW32 compiler

[Marco Eichelberg]

The error message is pretty obvious, isn't it. You are not linking all libraries needed to allow the linker to resolve all references. In particular, you are missing the libijg8, libijg12 and libijg16 libraries located in the subdirectories of the same name in dcmjpeg.

[enrique]

Actually I had tried in both ways (with and without those libraries), but it made no difference. I should had posted the right log, sorry =(
Follow thw log with the ijg* libraries:

Compilador: Default compiler
Building Makefile: "C:\Prog\Dicom\dll\Makefile.win"
Executando make clean
rm -f dllmain.o libdcmcjpeg.dll

g++.exe -c dllmain.cpp -o dllmain.o -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include" -I"C:/Dev-Cpp/include/c++/3.4.2/backward" -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32" -I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include" -I"C:/Prog/Dicom/config/include" -I"C:/Prog/Dicom/dcmjpeg/include" -I"C:/Prog/Dicom/ofstd/include" -I"C:/Prog/Dicom/dcmdata/include" -I"C:/Prog/Dicom/dcmimgle/include" -I"C:/Prog/Dicom/dcmimage/include" -I"C:/Prog/Dicom/dcmjpeg/libijg8" -I"C:/Prog/Dicom/dcmjpeg/libijg12" -I"C:/Prog/Dicom/dcmjpeg/libijg16" -DBUILDING_DLL=1

dllwrap.exe --output-def liblibdcmcjpeg.def --driver-name c++ --implib liblibdcmcjpeg.a dllmain.o -L"C:/Dev-Cpp/lib" --no-export-all-symbols --add-stdcall-alias ../dcmjpeg/dcmjpeg.a ../dcmdata/dcmdata.a ../dcmimage/dcmimage.a ../dcmimgle/dcmimgle.a ../ofstd/libofstd.a ../dcmjpeg/libijg8/libijg8.a ../dcmjpeg/libijg12/libijg12.a ../dcmjpeg/libijg16/libijg16.a ../../../Dev-Cpp/lib/libnetapi32.a ../../../Dev-Cpp/lib/libwsock32.a -o libdcmcjpeg.dll

../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0xf4b): undefined reference to `jpeg8_std_error'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0xfb5): undefined reference to `jpeg8_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1092): undefined reference to `jpeg8_CreateCompress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1102): undefined reference to `jpeg8_set_defaults'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x112c): undefined reference to `jpeg8_set_colorspace'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x119b): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x11cb): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x11fb): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1236): undefined reference to `jpeg8_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1244): undefined reference to `jpeg8_simple_progression'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1272): undefined reference to `jpeg8_simple_lossless'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x13c8): undefined reference to `jpeg8_start_compress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1427): undefined reference to `jpeg8_write_scanlines'

../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x1441): undefined reference to `jpeg8_finish_compress'
../dcmjpeg/dcmjpeg.a(djeijg8.o):djeijg8.cxx:(.text+0x144f): undefined reference to `jpeg8_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0xf57): undefined reference to `jpeg12_std_error'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0xfc1): undefined reference to `jpeg12_destroy_compress'

../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x109e): undefined reference to `jpeg12_CreateCompress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x110e): undefined reference to `jpeg12_set_defaults'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1138): undefined reference to `jpeg12_set_colorspace'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x119a): undefined reference to `jpeg12_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x11ca): undefined reference to `jpeg12_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1205): undefined reference to `jpeg12_set_quality'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1213): undefined reference to `jpeg12_simple_progression'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1241): undefined reference to `jpeg12_simple_lossless'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1397): undefined reference to `jpeg12_start_compress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x13f8): undefined reference to `jpeg12_write_scanlines'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1412): undefined reference to `jpeg12_finish_compress'
../dcmjpeg/dcmjpeg.a(djeijg12.o):djeijg12.cxx:(.text+0x1420): undefined reference to `jpeg12_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x7db): undefined reference to `jpeg16_std_error'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x845): undefined reference to `jpeg16_destroy_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x913): undefined reference to `jpeg16_CreateCompress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x983): undefined reference to `jpeg16_set_defaults'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x9ad): undefined reference to `jpeg16_set_colorspace'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0x9f0): undefined reference to `jpeg16_simple_lossless'

../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xc17): undefined reference to `jpeg16_start_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xc78): undefined reference to `jpeg16_write_scanlines'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xc92): undefined reference to `jpeg16_finish_compress'
../dcmjpeg/dcmjpeg.a(djeijg16.o):djeijg16.cxx:(.text+0xca0): undefined reference to `jpeg16_destroy_compress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x704): undefined reference to `jpeg8_resync_to_restart'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x7a7): undefined reference to `jpeg8_std_error'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x925): undefined reference to `jpeg8_CreateDecompress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0x9ab): undefined reference to `jpeg8_destroy_decompress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xbc2): undefined reference to `jpeg8_read_header'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xd8c): undefined reference to `jpeg8_start_decompress'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xef4): undefined reference to `jpeg8_read_scanlines'
../dcmjpeg/dcmjpeg.a(djdijg8.o):djdijg8.cxx:(.text+0xf76): undefined reference to `jpeg8_finish_decompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x704): undefined reference to `jpeg12_resync_to_restart'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x7a7): undefined reference to `jpeg12_std_error'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x925): undefined reference to `jpeg12_CreateDecompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0x9ab): undefined reference to `jpeg12_destroy_decompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xbc2): undefined reference to `jpeg12_read_header'

../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xd8c): undefined reference to `jpeg12_start_decompress'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xef8): undefined reference to `jpeg12_read_scanlines'
../dcmjpeg/dcmjpeg.a(djdijg12.o):djdijg12.cxx:(.text+0xf7a): undefined reference to `jpeg12_finish_decompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x704): undefined reference to `jpeg16_resync_to_restart'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x7a7): undefined reference to `jpeg16_std_error'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x925): undefined reference to `jpeg16_CreateDecompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0x9ab): undefined reference to `jpeg16_destroy_decompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xbc2): undefined reference to `jpeg16_read_header'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xd8c): undefined reference to `jpeg16_start_decompress'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xef8): undefined reference to `jpeg16_read_scanlines'
../dcmjpeg/dcmjpeg.a(djdijg16.o):djdijg16.cxx:(.text+0xf7a): undefined reference to `jpeg16_finish_decompress'
collect2: ld returned 1 exit status

dllwrap.exe: no export definition file provided.
Creating one, but that may not be what you want
dllwrap.exe: c++ exited with status 1

make.exe: *** [libdcmcjpeg.dll] Error 1

Execução terminada

[Marco Eichelberg]

You are not linking all required libraries. Specifically libijg8, libijg12 and libijg16 are missing.

[enrique]

take a look at the log, the libraries was there...

dllwrap.exe --output-def liblibdcmcjpeg.def --driver-name c++ --implib liblibdcmcjpeg.a dllmain.o -L"C:/Dev-Cpp/lib" --no-export-all-symbols --add-stdcall-alias ../dcmjpeg/dcmjpeg.a ../dcmdata/dcmdata.a ../dcmimage/dcmimage.a ../dcmimgle/dcmimgle.a ../ofstd/libofstd.a ../dcmjpeg/libijg8/libijg8.a ../dcmjpeg/libijg12/libijg12.a ../dcmjpeg/libijg16/libijg16.a ../../../Dev-Cpp/lib/libnetapi32.a ../../../Dev-Cpp/lib/libwsock32.a -o libdcmcjpeg.dll

[Per]

I think you need to list them earlier in the link order.

[enrique]

in fact I have traied with several links order...

could some configuration flag, cause this misbehavior?

[Marco Eichelberg]

The only thing I could think of that would cause this behaviour (unless the library files you are linking against are damaged, e.g., empty) would be a manual removal of the macro NEED_SHORT_EXTERNAL_NAMES, which is unconditionally defined in jconfig[8|12|16].h - this macro causes all functions in the IJG library to be renamed to something that is unique for the 8, 12 or 16 bit version of the library, respectively.

[Per]

You could try to list them several times at different places in the link order. Not sure if the Windows linker works this way, but this sometimes solves such issues for me on Linux.

[enrique]

Marco, I already did that...I tried with and without that macro and it made no difference.
Also, I tested the libijg8 library with another calling program, and it does worked. Thanks for the help.
Per, thanks for the tip but it didn't work.