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To be executed correctly, every application requires a range of libraries. Unfortunately,
the names for the 32-bit and 64-bit versions of these libraries are identical. They must
be differentiated from each other in another way.
To retain compatibility with the 32-bit version, the libraries are stored at the same place
in the system as in the 32-bit environment. The 32-bit version of libc.so.6 is located
under /lib/libc.so.6 in both the 32-bit and 64-bit environments.
All 64-bit libraries and object files are located in directories called lib64. The 64-bit
object files you would normally expect to find under /lib, /usr/lib, and /usr/
X11R6/lib are now found under /lib64, /usr/lib64, and /usr/X11R6/
lib64. This means that there is space for the 32-bit libraries under /lib, /usr/lib
and /usr/X11R6/lib, so the filename for both versions can remain unchanged.
Subdirectories of 32-bit /lib directories whose data content does not depend on the
word size are not moved. For example, the X11 fonts are still found in the usual location
under /usr/X11R6/lib/X11/fonts. This scheme conforms to LSB (Linux
Standards Base) and FHS (File System Hierarchy Standard).
16.2 Software Development
A biarch development tool chain allows generation of 32-bit and 64-bit objects. The
default is to compile 64-bit objects. It is possible to generate 32-bit objects by using
special flags. For GCC, this special flag is -m32.
All header files must be written in an architecture-independent form. The installed 32-
bit and 64-bit libraries must have an API (application programming interface) that
matches the installed header files. The normal SUSE Linux Enterprise environment is
designed according to this principle. In the case of manually updated libraries, resolve
these issues yourself.
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Deployment Guide
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Troubleshooting
