Linker Tasks

Using Linker commands

$ nm -p sem.o

0000000000 U $global$

1073741824 d $THIS_DATA$

1073741864 b $THIS_BSS$

0000000004 cS sem_val

0000000000 T check_sem_val

0000000036 T foo

0000000000 U printf

0000000088 T bar

0000000140 T sem

In this example, check_sem_val, foo, bar, and sem are all global definitions. To create a shared library where check_sem_val is a hidden, local definition, you could do the following:

$ ld -b -h check_sem_val sem.o

Tips on Using -h

You should not combine -hand +e options on the same command line. For instance, suppose you specify +e sem. This would export the symbol sem and hide all other symbols. Any additional -hoptions would be unnecessary. If both -hand +e are used on the same symbol, the -hoverrides the +e option.

The linker command line could get quite lengthy and difficult to read if several such options were specified. And in fact, you could exceed the maximum HP-UX command line length if you specify too many options. To get around this, use ld linker option files, described under “Passing Linker Options in a file with -c”. You can specify any number of -hor +e options in this file.

Hiding and Exporting Symbols When Building a Shared Library

When building a shared library, you might want to hide a symbol in the library for several reasons:

It can improve performance because the dynamic loader does not have to bind hidden symbols. Since most symbols need not be exported from a shared library, hiding selected symbols can have a significant impact on performance.

It ensures that the definition can only be accessed by other routines in the same library. When linking with other object modules or libraries, the definition will be hidden from them.

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Chapter 3

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Kenwood HP 9000 manual Tips on Using -h, Hiding and Exporting Symbols When Building a Shared Library

HP 9000 specifications

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