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• Gcc Ld Library Path

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5 Setting environment variables

On Windows, TOMLAB requires the directory tomlab/shared to be included in the environment variable PATH.

On Linux, TOMLAB requires the tomlab/shared folder to be present in the LD_LIBRARY_PATH environment variable. If TOMLAB is installed with super-user privileges on Linux, the installer will add a ldconfig entry to /etc/ld.so.conf.d/tomlab.conf, eliminating the need for manual manipulation of LD_LIBRARY_PATH.

It is possible to set this in several ways.

5.1 Shared libraries path

The library search path environment variable name differs betweendifferent systems:

• Linux: LD_LIBRARY_PATH
• Windows: PATH

TOMLAB for Mac OS X does not currently require the corresponding variable to be set, due to all binaries having hard-coded paths to their respective dependencies. This, on the other hand, demands that binary files in the TOMLAB directory are not moved from their locations.

The way environment variables are set varies depending on operating systems and shells.

5.1.1 Windows

To set the PATH environment variable permanently on Windows,do: Control Panel → System → Advanced→ Environment Variables. Assuming TOMLAB was installedin C:tomlab, append (or prepend) C:tomlabshared separated to the otherentries with a semi-colon (;) to the PATH environmentvariable.

The PATH environment variable can also be set temporarily ina running command shell. This is done by doing

This change will only be applied in that command shell, and willtherefore be discarded when the command shell is terminated.

5.1.2 Linux systems

Set on command line when invoking MATLAB:

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where <ml> is the name of your MATLAB executable andtpath is the TOMLAB installation path. If LD_LIBRARY_PATHis already set to something and you wish to preserve this, includethe part in [ ] - but not the actual brackets themselves.

Set in $HOME/.bashrc, $HOME/.profile, $HOME/.cshrc (or$HOME/.matlab7rc.sh if it exists):

If you have an existing value in LD_LIBRARY_PATH, use a colon : toseparate directories when adding the TOMLAB directory:

If installing for multiple users as super-user, /etc/ld.so.conf.d/tomlab.conf is automatically created, eliminating the need for path manipulation.

Mac OS X installations do not require the corresponding variable DYLD_LIBRARY_PATH to be set, but proper function depends on the locationof the tomlab/shared folder and its contents.

5.1.3 MATLAB 7.8+ on 64-bit Linux

A potential problem concerning shared library versions may lead to crashes when running certain TOMLAB MEX files.This is related to MATLAB and/or the runtime linker loading the wrong version of a support library.

The following workaround is suggested:

Start Matlab 7.8+ from a shell prompt with the following option:

In the above command, replace $TOMLAB with the path to your TOMLABinstallation, and $MATLAB78 with the name of your MATLAB 7.8binary. This may vary depending on your particular setup, e.g. ifhaving a symbolic link to the MATLAB binary or not. You may need tospecify the full path to the MATLAB installation. For example:

Additionally, if using the KNITRO solver and you experience errors about libgomp.sonot being found, add an LD_PRELOAD statement for this library too. Use locate or find to find its full path. It is not supplied with TOMLAB.

(MAC OS X)
How to Load a Java Native/Shared Library (.jnilib)

There are several ways to make it possible for the Java runtime to find and load a native shared library (.jnilib) at runtime. I will list them briefly here, followed by examples with more explanation below.

1. Call System.load to load the .jnilib from an explicitly specified absolute path.
2. Copy the shared library to one of the paths already listed in java.library.path
3. Modify the LD_LIBRARY_PATH environment variable to include the directory where the shared library is located.
4. Specify the java.library.path on the command line by using the -D option.
5. Put the .jnilib in /Library/Java/Extensions/.

1. Call System.load to load the shared library from an explicitly specified absolute path.

This choice removes all uncertainty, but embeds a hard-coded path within your Java application. Example:

2. Copy the shared library to one of the paths already listed in java.library.path

To view the paths listed in java.library.path, run this Java code:

Note: The java.library.path is initialized from the LD_LIBRARY_PATH environment variable.

The loadLibrary method may be used when the directory containing the shared library is in java.library.path. To load 'libchilkat.jnilib', call System.loadLibrary('chilkat'), as shown below.

3. Modify the LD_LIBRARY_PATH environment variable to include the path where the Chilkat shared library is located.

For Bourne Shell, K Shell or Bash, type:

For C Shell, type:

4. Specify the java.library.path on the command line by using the -D option.

For example:

Additional Notes:

Gcc Ld Library Path

From developer.apple.com: 'JNI libraries are named with the library name used in the System.loadLibrary() method of your Java code, prefixed by lib and suffixed with .jnilib. For example, System.loadLibrary('hello') loads the library named libhello.jnilib. Java HotSpot also recognizes .dylib as a valid JNI library format as of Mac OS X v10.5.'