Linker Tools

Finding Object Library Ordering Relationships with lorder(1)

Finding Object Library Ordering Relationships with lorder(1)

The lorder command finds the ordering relation for an object library. You can specify one or more object or archive library files (see ar(1)) on the command line or read those files from standard input. The standard output is a list of pairs of object file names, meaning that the first file of the pair refers to external identifiers defined in the second.

You can process the output with tsort to find an ordering of a library suitable for one-pass access by ld (see tsort(1) and ld(1)). The linker ld is capable of multiple passes over an archive in the archive format and does not require that you use lorder when building an archive. Using the lorder command may, however, allow for a slightly more efficient access of the archive during the link-edit process.

The symbol table maintained by ar allows ld to randomly access symbols and files in the archive, making the use of lorder unnecessary when building archive libraries (see ar(1)).

lorder overlooks object files whose names do not end with .o, even when contained in library archives, and attributes their global symbols and references to some other file.

Examples

•Build a new library from existing .o files:

$ar cr library ‘lorder *.o tsort‘

•When creating libraries with so many objects that the shell cannot properly handle the *.o expansion, the following technique may prove useful:

$ls grep ’.o$’lordertsortxargs ar cq library

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Chapter 4

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