DaniWeb Forum Index > Software Development > C++

C++ RSS

Missing Library in Compiling

Please support our C++ advertiser: Intel Parallel Studio Home

•

Join Date: Jul 2008

Posts: 1

Reputation: nesalang is an unknown quantity at this point

Solved Threads: 0

nesalang

Offline

Newbie Poster

Missing Library in Compiling

Jul 2nd, 2008

When I try to compile

g++-4.2 memJpegDecoder.cpp

I get these errors.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
/usr/lib/gcc/x86_64-linux-gnu/4.2.1/../../../../lib/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/cci2IOXX.o: In function `memJpegDecoder::decompress()':
memJpegDecoder.cpp:(.text+0x5b5): undefined reference to `jpeg_calc_output_dimensions'
memJpegDecoder.cpp:(.text+0x68a): undefined reference to `jpeg_start_decompress'
memJpegDecoder.cpp:(.text+0x6ac): undefined reference to `jpeg_read_scanlines'
memJpegDecoder.cpp:(.text+0x730): undefined reference to `jpeg_finish_decompress'
memJpegDecoder.cpp:(.text+0x739): undefined reference to `jpeg_destroy_decompress'
/tmp/cci2IOXX.o: In function `memJpegDecoder::readHeader()':
memJpegDecoder.cpp:(.text+0x756): undefined reference to `jpeg_read_header'
/tmp/cci2IOXX.o: In function `memJpegDecoder::setSource(char*, long)':
memJpegDecoder.cpp:(.text+0x79a): undefined reference to `jpeg_std_error'
memJpegDecoder.cpp:(.text+0x7b7): undefined reference to `jpeg_CreateDecompress'
memJpegDecoder.cpp:(.text+0x7c8): undefined reference to `jpeg_mem_src'
collect2: ld returned 1 exit status
/usr/lib/gcc/x86_64-linux-gnu/4.2.1/../../../../lib/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/cci2IOXX.o: In function `memJpegDecoder::decompress()':
memJpegDecoder.cpp:(.text+0x5b5): undefined reference to `jpeg_calc_output_dimensions'
memJpegDecoder.cpp:(.text+0x68a): undefined reference to `jpeg_start_decompress'
memJpegDecoder.cpp:(.text+0x6ac): undefined reference to `jpeg_read_scanlines'
memJpegDecoder.cpp:(.text+0x730): undefined reference to `jpeg_finish_decompress'
memJpegDecoder.cpp:(.text+0x739): undefined reference to `jpeg_destroy_decompress'
/tmp/cci2IOXX.o: In function `memJpegDecoder::readHeader()':
memJpegDecoder.cpp:(.text+0x756): undefined reference to `jpeg_read_header'
/tmp/cci2IOXX.o: In function `memJpegDecoder::setSource(char*, long)':
memJpegDecoder.cpp:(.text+0x79a): undefined reference to `jpeg_std_error'
memJpegDecoder.cpp:(.text+0x7b7): undefined reference to `jpeg_CreateDecompress'
memJpegDecoder.cpp:(.text+0x7c8): undefined reference to `jpeg_mem_src'
collect2: ld returned 1 exit status

I've tried linking the libjpeg files in /usr/lib, but it doesn't seem to be working. The header file that makes these calls can be found at https://setisvn.ssl.berkeley.edu/svn...glib/jpeglib.h. Please let me know if you have any questions.

Last edited by nesalang; Jul 2nd, 2008 at 5:41 pm.

•

Join Date: Aug 2005

Posts: 15,433

Reputation: Ancient Dragon has a reputation beyond repute

Solved Threads: 1471

Ancient Dragon Ancient Dragon is offline

Offline

Still Learning

Re: Missing Library in Compiling

Jul 2nd, 2008

>>g++-4.2 memJpegDecoder.cpp
That is attempting to compile the *.cpp and create the executable program a.out. From the error message I assume that *.cpp file doesnot contain a main() function, which is required of all c and c++ executable programs.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

•

Join Date: May 2008

Posts: 10

Reputation: hazmatt is an unknown quantity at this point

Solved Threads: 0

hazmatt

Offline

Newbie Poster

Re: Missing Library in Compiling

Jul 5th, 2008

I'm working on a different part of the same project with him. Hopefully I'll get a copy of his work within a day or two, but the main thing we're trying to do right now that's giving those errors is that the project builds correctly with cmake. We're trying to write our own make file for the entire project, so we're trying to get it to work with make instead of cmake. I'll be back when I get his part.