View Source: CNotes - Waikato Linux Users Group

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InNeedOfRefactor

!Where can I set paths to the directories my shared libraries are stored in?

The list of directories to be searched is stored in the file ''/etc/ld.so.conf''.
Simply append your desired directory to this file.

*echo "/usr/local/lib" | sudo tee -a /etc/ld.so.conf

Now run ''ldconfig -v''

__Note:__ Don't do this for [Gentoo]. That already has <tt>/usr/local/lib</tt> included, and in any case <tt>/etc/ld.so.conf</tt> is automatically generated from the files in <tt>/etc/env.d</tt>, so any customizations you want must be made in the latter.

Note : [ldconfig(8)] must be run whenever a DLL is added, when a DLL is removed, or when the set of DLL directories changes

!Which libraries is my system aware of?

*ldconfig -Nv

!!Environment Variables

!LD_LIBRARY_PATH

A colon-separated set of directories where libraries should be searched for first, before the standard set of directories.

*export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/new/dir/to/add"

!LDLIBS

Contains a list of external libraries to link with.

For example to link with the libtrace library and the math library:
*export LDLIBS="-ltrace -lm"

!How to define macros inside the gcc command.

gcc -D<macro_name>=<definition>

Note : The ''=<definition>'' part is optional.

For example:

*gcc -DEVENT_DEBUG=1
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See also SharedLibraryNotes

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Last edited on Wednesday, January 28, 2009 10:39:31 am by AristotlePagaltzis

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