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

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  15. A GNU Manual

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  25. <title>Header Dirs (GNU Compiler Collection (GCC) Internals)</title>

  26. 

  27. <meta name="description" content="Header Dirs (GNU Compiler Collection (GCC) Internals)">

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  33. <link href="Option-Index.html#Option-Index" rel="index" title="Option Index">

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

  35. <link href="index.html#Top" rel="up" title="Top">

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  70. <a name="Header-Dirs"></a>

  71. <div class="header">

  72. <p>

  73. Next: <a href="Type-Information.html#Type-Information" accesskey="n" rel="next">Type Information</a>, Previous: <a href="Collect2.html#Collect2" accesskey="p" rel="prev">Collect2</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>

  74. </div>

  75. <hr>

  76. <a name="Standard-Header-File-Directories"></a>

  77. <h2 class="chapter">22 Standard Header File Directories</h2>

  78. 

  79. <p><code>GCC_INCLUDE_DIR</code> means the same thing for native and cross.  It is

  80. where GCC stores its private include files, and also where GCC

  81. stores the fixed include files.  A cross compiled GCC runs

  82. <code>fixincludes</code> on the header files in <samp>$(tooldir)/include</samp>.

  83. (If the cross compilation header files need to be fixed, they must be

  84. installed before GCC is built.  If the cross compilation header files

  85. are already suitable for GCC, nothing special need be done).

  86. </p>

  87. <p><code>GPLUSPLUS_INCLUDE_DIR</code> means the same thing for native and cross.  It

  88. is where <code>g++</code> looks first for header files.  The C++ library

  89. installs only target independent header files in that directory.

  90. </p>

  91. <p><code>LOCAL_INCLUDE_DIR</code> is used only by native compilers.  GCC

  92. doesn&rsquo;t install anything there.  It is normally

  93. <samp>/usr/local/include</samp>.  This is where local additions to a packaged

  94. system should place header files.

  95. </p>

  96. <p><code>CROSS_INCLUDE_DIR</code> is used only by cross compilers.  GCC

  97. doesn&rsquo;t install anything there.

  98. </p>

  99. <p><code>TOOL_INCLUDE_DIR</code> is used for both native and cross compilers.  It

  100. is the place for other packages to install header files that GCC will

  101. use.  For a cross-compiler, this is the equivalent of

  102. <samp>/usr/include</samp>.  When you build a cross-compiler,

  103. <code>fixincludes</code> processes any header files in this directory.

  104. </p>

  105. 

  106. 

  107. 

  108. </body>

  109. </html>