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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the BFD library.

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  27. <title>Adding symbols from an archive (Untitled Document)</title>

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  29. <meta name="description" content="Adding symbols from an archive (Untitled Document)">

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  36. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  37. <link href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" rel="up" title="Adding Symbols to the Hash Table">

  38. <link href="Performing-the-Final-Link.html#Performing-the-Final-Link" rel="next" title="Performing the Final Link">

  39. <link href="Adding-symbols-from-an-object-file.html#Adding-symbols-from-an-object-file" rel="prev" title="Adding symbols from an object file">

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  69. </head>

  70. 

  71. <body lang="en">

  72. <a name="Adding-symbols-from-an-archive"></a>

  73. <div class="header">

  74. <p>

  75. 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> &nbsp; [<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>

  76. </div>

  77. <hr>

  78. <a name="Adding-symbols-from-an-archive-1"></a>

  79. <h4 class="subsubsection">2.17.2.3 Adding symbols from an archive</h4>

  80. <p>When the <code>_bfd_link_add_symbols</code> routine is passed an

  81. archive, it must look through the symbols defined by the

  82. archive and decide which elements of the archive should be

  83. included in the link.  For each such element it must call the

  84. <code>add_archive_element</code> linker callback, and it must add the

  85. symbols from the object file to the linker hash table.  (The

  86. callback may in fact indicate that a replacement BFD should be

  87. used, in which case the symbols from that BFD should be added

  88. to the linker hash table instead.)

  89. </p>

  90. <a name="index-_005fbfd_005fgeneric_005flink_005fadd_005farchive_005fsymbols"></a>

  91. <p>In most cases the work of looking through the symbols in the

  92. archive should be done by the

  93. <code>_bfd_generic_link_add_archive_symbols</code> function.

  94. <code>_bfd_generic_link_add_archive_symbols</code> is passed a function

  95. to call to make the final decision about adding an archive

  96. element to the link and to do the actual work of adding the

  97. symbols to the linker hash table.  If the element is to

  98. be included, the <code>add_archive_element</code> linker callback

  99. routine must be called with the element as an argument, and

  100. the element&rsquo;s symbols must be added to the linker hash table

  101. just as though the element had itself been passed to the

  102. <code>_bfd_link_add_symbols</code> function.

  103. </p>

  104. <p>When the a.out <code>_bfd_link_add_symbols</code> function receives an

  105. archive, it calls <code>_bfd_generic_link_add_archive_symbols</code>

  106. passing <code>aout_link_check_archive_element</code> as the function

  107. argument. <code>aout_link_check_archive_element</code> calls

  108. <code>aout_link_check_ar_symbols</code>.  If the latter decides to add

  109. the element (an element is only added if it provides a real,

  110. non-common, definition for a previously undefined or common

  111. symbol) it calls the <code>add_archive_element</code> callback and then

  112. <code>aout_link_check_archive_element</code> calls

  113. <code>aout_link_add_symbols</code> to actually add the symbols to the

  114. linker hash table - possibly those of a substitute BFD, if the

  115. <code>add_archive_element</code> callback avails itself of that option.

  116. </p>

  117. <p>The ECOFF back end is unusual in that it does not normally

  118. call <code>_bfd_generic_link_add_archive_symbols</code>, because ECOFF

  119. archives already contain a hash table of symbols.  The ECOFF

  120. back end searches the archive itself to avoid the overhead of

  121. creating a new hash table.

  122. </p>

  123. <hr>

  124. <div class="header">

  125. <p>

  126. 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> &nbsp; [<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>

  127. </div>

  128. 

  129. 

  130. 

  131. </body>

  132. </html>