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- <a name="Adding-symbols-from-an-archive"></a>
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- <p>
- Previous: <a href="Adding-symbols-from-an-object-file.html#Adding-symbols-from-an-object-file" accesskey="p" rel="prev">Adding symbols from an object file</a>, Up: <a href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" accesskey="u" rel="up">Adding Symbols to the Hash Table</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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- <a name="Adding-symbols-from-an-archive-1"></a>
- <h4 class="subsubsection">2.17.2.3 Adding symbols from an archive</h4>
- <p>When the <code>_bfd_link_add_symbols</code> routine is passed an
- archive, it must look through the symbols defined by the
- archive and decide which elements of the archive should be
- included in the link. For each such element it must call the
- <code>add_archive_element</code> linker callback, and it must add the
- symbols from the object file to the linker hash table. (The
- callback may in fact indicate that a replacement BFD should be
- used, in which case the symbols from that BFD should be added
- to the linker hash table instead.)
- </p>
- <a name="index-_005fbfd_005fgeneric_005flink_005fadd_005farchive_005fsymbols"></a>
- <p>In most cases the work of looking through the symbols in the
- archive should be done by the
- <code>_bfd_generic_link_add_archive_symbols</code> function.
- <code>_bfd_generic_link_add_archive_symbols</code> is passed a function
- to call to make the final decision about adding an archive
- element to the link and to do the actual work of adding the
- symbols to the linker hash table. If the element is to
- be included, the <code>add_archive_element</code> linker callback
- routine must be called with the element as an argument, and
- the element’s symbols must be added to the linker hash table
- just as though the element had itself been passed to the
- <code>_bfd_link_add_symbols</code> function.
- </p>
- <p>When the a.out <code>_bfd_link_add_symbols</code> function receives an
- archive, it calls <code>_bfd_generic_link_add_archive_symbols</code>
- passing <code>aout_link_check_archive_element</code> as the function
- argument. <code>aout_link_check_archive_element</code> calls
- <code>aout_link_check_ar_symbols</code>. If the latter decides to add
- the element (an element is only added if it provides a real,
- non-common, definition for a previously undefined or common
- symbol) it calls the <code>add_archive_element</code> callback and then
- <code>aout_link_check_archive_element</code> calls
- <code>aout_link_add_symbols</code> to actually add the symbols to the
- linker hash table - possibly those of a substitute BFD, if the
- <code>add_archive_element</code> callback avails itself of that option.
- </p>
- <p>The ECOFF back end is unusual in that it does not normally
- call <code>_bfd_generic_link_add_archive_symbols</code>, because ECOFF
- archives already contain a hash table of symbols. The ECOFF
- back end searches the archive itself to avoid the overhead of
- creating a new hash table.
- </p>
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- <div class="header">
- <p>
- Previous: <a href="Adding-symbols-from-an-object-file.html#Adding-symbols-from-an-object-file" accesskey="p" rel="prev">Adding symbols from an object file</a>, Up: <a href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" accesskey="u" rel="up">Adding Symbols to the Hash Table</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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