Creating and Using Libraries

Using Shared Libraries in 64-bit mode

cc -c main.c

cc -c +z a.c b.c

ld -b a.o -o libA.sl ld -b b.o -o libB.sl

cc main.o libA.sl libB.sl -o test3

The 32-bit mode linker toolset produces:

$ test3

object is 1

The 32-bit mode linker toolset defines the object global variable in libA.sl as a storage export symbol. The dynamic loader, when searching for a definition of object to satisfy the import request in libA.sl, does not stop with the storage export in that library. It continues to see if there is a data export symbol for the same symbol definition.

The 64-bit mode linker toolset produces:

$ test 3

object is 0

The 64-bit mode linker toolset does not allow storage exports from a shared library. The uninitialized variable called object in a.o turns into a data export in libA.sl, with an initial value of 0. During symbol resolution for the import request from that same library, the dynamic loader stops with the first seen definition.

Symbol Searching in Dependent Libraries

In the 64-bit mode linker toolset, the linker searches dependent libraries in a breadth-first order for symbol resolution. This means it searches libraries linked to the main program file before libraries linked to shared libraries. This behavior change is consistent with other SVR4 systems. The linker also searches siblings of a dependent shared library before its children. For example, using the structure described in Figure 5-25, if libD had dependent libraries libDK and libLH, libD, libE, libF, then libDK, libLH would be searched in that order. The dlopen library management routines and executable files (a.out) created by the linker with the +std option (default) use the breadth-first search order.

The 32-bit mode linker toolset searches dependent libraries in a depth-first order. This means it searches dependent shared library files in the order in which they are linked to shared libraries. The shl_load library management routines and executable files (a.out) created by the linker with the +compat option use the depth-first search order.

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Kenwood HP 9000 manual Symbol Searching in Dependent Libraries, 182
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HP 9000 specifications

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