Creating and Using Libraries

Using Shared Libraries in 64-bit mode

LD_LIBRARY_PATH and the SHLIB_PATH environment variable to add directories to the run time search path for shared libraries, unless the ld +noenvvar option is set.

In the 32-bit mode of the linker toolset (selected by the +compat option), the linker enables run-time dynamic path searching when you link a program with the -llibraryand +b path_name options. Or, you can use the -llibraryoption with the +s path_name option. When programs are linked with +s, the dynamic loader searches directories specified by the SHLIB_PATH environment variable to find shared libraries.

The following example shows dynamic path searching changes for 64-bit mode.

ld /opt/langtools/lib/crt0.o main.o \ Subject to

-lfoo -o main

dynamic path searching.

In 32-bit mode, main aborts at run time if libfoo.sl is moved from its standard location, /usr/lib or /usr/ccs/lib. The linker does not do dynamic path searching unless you specify the +b or +s options to the ld or chatr commands. In 64-bit mode, the dynamic loader searches for libfoo.sl in the directories specified by the LD_LIBRARY_PATH and SHLIB_PATH environment variables.

Shared Library Symbol Binding Semantics

Symbol binding resolution, both at link time and run time, changes slightly in the 64-bit mode HP-UX linker toolset. The symbol binding policy is more compatible with other open systems.

This section covers the following topics:

Link-time symbol resolution in shared libraries

Resolution of unsatisfied shared library references

Promotion of uninitialized global variables

Symbol searching in dependent libraries

Link-Time Symbol Resolution in Shared Libraries

In the 64-bit mode of the linker toolset, the linker remembers all symbols in a shared library for the duration of the link. Global definitions satisfy trailing references, and unsatisfied symbols remaining in shared libraries are reported.

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Kenwood HP 9000 manual Shared Library Symbol Binding Semantics, Link-Time Symbol Resolution in Shared Libraries, 178

HP 9000 specifications

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