Implement jpegsrc.v8b.tar.gz LINUX

[ChrisW67]

The configure script defaults to automatic detection of the presence of a system JPEG library. If you have the -I and -L options set correctly then it should find yours in preference to the vendor's.

If you really must set it manually then:

• Clearly the first option is of no use.
• The second one will ignore the system JPEG library and also your JPEG library and use whatever is bundled inside Qt (v8 of the library in 4.7.0).
• That leaves only one option.

[ivanqt]

Hi ChrisW67,

I installed jpeg-8b in this directory:
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib

[root@ivan jpeg-8blib]# ls
bin include lib share

Then I created a new *.conf file (jpeg8b.conf) in ld.so.conf.d directory:
[ivan@ivan ld.so.conf.d]$ pwd
/etc/ld.so.conf.d
[ivan@ivan ld.so.conf.d]$ ls -alth
total 56K
drwxr-xr-x. 133 root root 8.0K Dec 8 00:58 ..
drwxr-xr-x. 2 root root 4.0K Dec 8 00:07 .
-rw-r--r-- 1 root root 74 Dec 8 00:07 jpeg8b.conf
-rw-r--r-- 1 root root 15 Nov 1 21:31 mysql-i386.conf
-rw-r--r-- 1 root root 25 Oct 27 11:08 xulrunner-32.conf
-r--r--r-- 1 root root 63 Oct 18 23:39 kernel-2.6.34.7-61.fc13.i686.PAE.conf
-r--r--r-- 1 root root 63 Sep 14 22:32 kernel-2.6.34.7-56.fc13.i686.PAE.conf
-r--r--r-- 1 root root 63 Sep 5 12:49 kernel-2.6.34.6-54.fc13.i686.PAE.conf
-rw-r--r-- 1 root root 15 Jul 29 08:10 opencv.conf
-rw-r--r--. 1 root root 20 Dec 22 2009 qt-i386.conf
[ivan@ivan ld.so.conf.d]$ cat jpeg8b.conf
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib/lib

After that I configured my Qt like this:

./configure -prefix /home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/Trolltech/Qt-4.7.1-ljpeg -opensource -I/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib/include -L/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib/lib -ljpeg

At the moment of type gmake, this error appears:
gmake[1]: Entering directory `/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/src/corelib'
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/bin/moc -DQT_SHARED -DQT_BUILD_CORE_LIB -DQT_NO_USING_NAMESPACE -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT3_SUPPORT -DQT_MOC_COMPAT -DQT_USE_FAST_OPERATOR_PLUS -DQT_USE_FAST_CONCATENATION -DELF_INTERPRETER=\"/lib/ld-linux.so.2\" -DHB_EXPORT=Q_CORE_EXPORT -DQT_NO_DEBUG -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_HAVE_SSE3 -DQT_HAVE_SSSE3 -DQT_HAVE_SSE4_1 -DQT_HAVE_SSE4_2 -DQT_HAVE_AVX -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../mkspecs/linux-g++ -I. -I../../include -I../../include/QtCore -I.rcc/release-shared -Iglobal -I../3rdparty/harfbuzz/src -I../3rdparty/md5 -I../3rdparty/md4 -I.moc/release-shared animation/qabstractanimation.h -o .moc/release-shared/moc_qabstractanimation.cpp
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/bin/moc: error while loading shared libraries: libjpeg.so.8: cannot open shared object file: No such file or directory
gmake[1]: *** [.moc/release-shared/moc_qabstractanimation.cpp] Error 127
gmake[1]: Leaving directory `/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/src/corelib'
gmake: *** [sub-corelib-make_default-ordered] Error 2

Do you have any idea?

Regards and thanks in advance

[ivanqt]

Hi ChrisW67,

I installed jpeg-8b in this directory:
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib

[root@ivan jpeg-8blib]# ls
bin include lib share

Then I created a new *.conf file (jpeg8b.conf) in ld.so.conf.d directory:
[ivan@ivan ld.so.conf.d]$ pwd
/etc/ld.so.conf.d
[ivan@ivan ld.so.conf.d]$ ls -alth
total 56K
drwxr-xr-x. 133 root root 8.0K Dec 8 00:58 ..
drwxr-xr-x. 2 root root 4.0K Dec 8 00:07 .
-rw-r--r-- 1 root root 74 Dec 8 00:07 jpeg8b.conf
-rw-r--r-- 1 root root 15 Nov 1 21:31 mysql-i386.conf
-rw-r--r-- 1 root root 25 Oct 27 11:08 xulrunner-32.conf
-r--r--r-- 1 root root 63 Oct 18 23:39 kernel-2.6.34.7-61.fc13.i686.PAE.conf
-r--r--r-- 1 root root 63 Sep 14 22:32 kernel-2.6.34.7-56.fc13.i686.PAE.conf
-r--r--r-- 1 root root 63 Sep 5 12:49 kernel-2.6.34.6-54.fc13.i686.PAE.conf
-rw-r--r-- 1 root root 15 Jul 29 08:10 opencv.conf
-rw-r--r--. 1 root root 20 Dec 22 2009 qt-i386.conf
[ivan@ivan ld.so.conf.d]$ cat jpeg8b.conf
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib/lib

After that I configured my Qt like this:

./configure -prefix /home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/Trolltech/Qt-4.7.1-ljpeg -opensource -I/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib/include -L/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/jpeg-8blib/lib -ljpeg

At the moment of type gmake, this error appears:
gmake[1]: Entering directory `/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/src/corelib'
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/bin/moc -DQT_SHARED -DQT_BUILD_CORE_LIB -DQT_NO_USING_NAMESPACE -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT3_SUPPORT -DQT_MOC_COMPAT -DQT_USE_FAST_OPERATOR_PLUS -DQT_USE_FAST_CONCATENATION -DELF_INTERPRETER=\"/lib/ld-linux.so.2\" -DHB_EXPORT=Q_CORE_EXPORT -DQT_NO_DEBUG -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_HAVE_SSE3 -DQT_HAVE_SSSE3 -DQT_HAVE_SSE4_1 -DQT_HAVE_SSE4_2 -DQT_HAVE_AVX -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../mkspecs/linux-g++ -I. -I../../include -I../../include/QtCore -I.rcc/release-shared -Iglobal -I../3rdparty/harfbuzz/src -I../3rdparty/md5 -I../3rdparty/md4 -I.moc/release-shared animation/qabstractanimation.h -o .moc/release-shared/moc_qabstractanimation.cpp
/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/bin/moc: error while loading shared libraries: libjpeg.so.8: cannot open shared object file: No such file or directory
gmake[1]: *** [.moc/release-shared/moc_qabstractanimation.cpp] Error 127
gmake[1]: Leaving directory `/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/QtInstallers/qt-everywhere-opensource-src-4.7.1/src/corelib'
gmake: *** [sub-corelib-make_default-ordered] Error 2

Do you have any idea?

Regards and thanks in advance

[SixDegrees]

It's already been pointed out many times that this isn't a configure problem. You can play with configure until the cows come home, but if the OS can't locate your dynamic library at runtime, your application will fail.

Put your library in the same directory as your executable as a first step. If that works, adjust your LD_LIBRARY_PATH to include your "standard" location. Better yet, install the library in some standard place where the dynamic linker already expects to find libraries, like /usr/lib or some other appropriate spot.

The linker is telling you everything you need to know: it doesn't know where your library is. You have to tell it.

If you're trying to build Qt using a different jpeg library than it was coded for, you're going to fail. No amount of linker magic can overcome a foreign API.

[ChrisW67]

You have actually built the JPEG library, haven't you?

Did you run ldconfig after playing with the global system library search path? In any case, for development purposes you are far better off leaving the system path alone and using the LD_LIBRARY_PATH environment variable (or installing Qt into a location that is already searched).

The configure command for Qt does not need the repeated -l flags you have given it.

This really is not rocket science:

#!/bin/bash
export MYPROJ=/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject
export MYJPEG=${MYPROJ}/jpeg-8blib
export LD_LIBRARY_PATH=${MYJPEG}/lib
cd ${MYPROJ}/QtInstallers/qt-everywhere-opensource-src-4.7.1
./configure -I${MYJPEG}/include -L${MYJPEG}/lib -prefix ${MYPROJ}/Trolltech/Qt-4.7.1
make

#!/bin/bash
export MYPROJ=/home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject
export MYJPEG=${MYPROJ}/jpeg-8blib
export LD_LIBRARY_PATH=${MYJPEG}/lib
cd ${MYPROJ}/QtInstallers/qt-everywhere-opensource-src-4.7.1
./configure -I${MYJPEG}/include -L${MYJPEG}/lib -prefix ${MYPROJ}/Trolltech/Qt-4.7.1
make

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The Qt source will happily build and run against this version of libjpeg (my system uses it globally). The version bundled inside Qt is version 8, I assume without the a and b patches. This whole exercise only has some value if Ivan wants something in the a or b patches, otherwise using the Qt bundled libjpeg would be a far easier option.

[ivanqt]

Hi ChrisW67,

Thanks for your support.

The last script works great. I'm using this script for linux-embedded.

At the end I installed libjpeg in /usr directory.
Example:
# ./configure -prefix /home/ivan/WinXP/Ivan_Maldonado/PeekDocuments/VideoProject/Trolltech/Qt-4.7.1-ljpeg -opensource -release -fast -system-libjpeg -ljpeg

Regards and thanks for all