32-Bit Environments and 64-Bit Environments
As described in 32-Bit Environments and 64-Bit Environments, the 64-bit link-editor,
ld
(1), is capable of generating 32-bit objects. In
addition, the 32-bit link-editor is capable of generating 64-bit
objects. Each of these objects has an associated support interface
defined.
The support interface for 64-bit objects is similar to the
interface of 32-bit objects, but ends in a 64 suffix.
For example ld_start
() and ld_start64
().
This convention allows both implementations of the support interface to reside
in a single shared object of each class, 32-bit and 64-bit.
The SGS_SUPPORT
environment variable can be specified
with a _32
or _64
suffix, and the
link-editor options -z ld32
and
-z ld64
can be used to define -S
option
requirements. These definitions will only be interpreted, respectively, by the
32-bit or 64-bit class of the link-editor. This enables both classes
of support library to be specified when the class of the link-editor might not
be known.