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<title>GNU Compiler Collection (GCC) Internals: Top Level</title>
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<p>
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Next: <a href="gcc-Directory.html#gcc-Directory" accesskey="n" rel="next">gcc Directory</a>, Previous: <a href="Configure-Terms.html#Configure-Terms" accesskey="p" rel="prev">Configure Terms</a>, Up: <a href="Source-Tree.html#Source-Tree" accesskey="u" rel="up">Source Tree</a> [<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>
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<hr>
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<a name="Top-Level-Source-Directory"></a>
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<h3 class="section">6.2 Top Level Source Directory</h3>
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<p>The top level source directory in a GCC distribution contains several
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files and directories that are shared with other software
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distributions such as that of GNU Binutils. It also contains several
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subdirectories that contain parts of GCC and its runtime libraries:
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</p>
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<dl compact="compact">
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<dt><samp>boehm-gc</samp></dt>
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<dd><p>The Boehm conservative garbage collector, used as part of the Java
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runtime library.
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</p>
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</dd>
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<dt><samp>config</samp></dt>
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<dd><p>Autoconf macros and Makefile fragments used throughout the tree.
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</p>
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</dd>
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<dt><samp>contrib</samp></dt>
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<dd><p>Contributed scripts that may be found useful in conjunction with GCC.
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One of these, <samp>contrib/texi2pod.pl</samp>, is used to generate man
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pages from Texinfo manuals as part of the GCC build process.
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</p>
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</dd>
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<dt><samp>fixincludes</samp></dt>
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<dd><p>The support for fixing system headers to work with GCC. See
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<samp>fixincludes/README</samp> for more information. The headers fixed by
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this mechanism are installed in <samp><var>libsubdir</var>/include-fixed</samp>.
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Along with those headers, <samp>README-fixinc</samp> is also installed, as
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<samp><var>libsubdir</var>/include-fixed/README</samp>.
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</p>
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</dd>
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<dt><samp>gcc</samp></dt>
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<dd><p>The main sources of GCC itself (except for runtime libraries),
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including optimizers, support for different target architectures,
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language front ends, and testsuites. See <a href="gcc-Directory.html#gcc-Directory">The
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<samp>gcc</samp> Subdirectory</a>, for details.
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</p>
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</dd>
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<dt><samp>gnattools</samp></dt>
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<dd><p>Support tools for GNAT.
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</p>
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</dd>
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<dt><samp>include</samp></dt>
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<dd><p>Headers for the <code>libiberty</code> library.
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</p>
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</dd>
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<dt><samp>intl</samp></dt>
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<dd><p>GNU <code>libintl</code>, from GNU <code>gettext</code>, for systems which do not
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include it in <code>libc</code>.
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</p>
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</dd>
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<dt><samp>libada</samp></dt>
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<dd><p>The Ada runtime library.
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</p>
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</dd>
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<dt><samp>libatomic</samp></dt>
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<dd><p>The runtime support library for atomic operations (e.g. for <code>__sync</code>
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and <code>__atomic</code>).
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</p>
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</dd>
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<dt><samp>libcpp</samp></dt>
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<dd><p>The C preprocessor library.
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</p>
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</dd>
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<dt><samp>libdecnumber</samp></dt>
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<dd><p>The Decimal Float support library.
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</p>
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</dd>
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<dt><samp>libffi</samp></dt>
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<dd><p>The <code>libffi</code> library, used as part of the Java runtime library.
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</p>
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</dd>
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<dt><samp>libgcc</samp></dt>
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<dd><p>The GCC runtime library.
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</p>
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</dd>
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<dt><samp>libgfortran</samp></dt>
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<dd><p>The Fortran runtime library.
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</p>
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</dd>
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<dt><samp>libgo</samp></dt>
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<dd><p>The Go runtime library. The bulk of this library is mirrored from the
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<a href="http://code.google.com/p/go/">master Go repository</a>.
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</p>
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</dd>
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<dt><samp>libgomp</samp></dt>
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<dd><p>The GNU Offloading and Multi Processing Runtime Library.
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</p>
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</dd>
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<dt><samp>libiberty</samp></dt>
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<dd><p>The <code>libiberty</code> library, used for portability and for some
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generally useful data structures and algorithms. See <a href="http://gcc.gnu.org/onlinedocs/libiberty/index.html#Top">Introduction</a> in <cite><small>GNU</small> libiberty</cite>, for more information
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about this library.
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</p>
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</dd>
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<dt><samp>libitm</samp></dt>
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<dd><p>The runtime support library for transactional memory.
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</p>
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</dd>
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<dt><samp>libjava</samp></dt>
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<dd><p>The Java runtime library.
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</p>
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</dd>
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<dt><samp>libobjc</samp></dt>
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<dd><p>The Objective-C and Objective-C++ runtime library.
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</p>
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</dd>
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<dt><samp>libquadmath</samp></dt>
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<dd><p>The runtime support library for quad-precision math operations.
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</p>
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</dd>
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<dt><samp>libssp</samp></dt>
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<dd><p>The Stack protector runtime library.
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</p>
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</dd>
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<dt><samp>libstdc++-v3</samp></dt>
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<dd><p>The C++ runtime library.
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</p>
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</dd>
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<dt><samp>lto-plugin</samp></dt>
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<dd><p>Plugin used by the linker if link-time optimizations are enabled.
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</p>
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</dd>
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<dt><samp>maintainer-scripts</samp></dt>
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<dd><p>Scripts used by the <code>gccadmin</code> account on <code>gcc.gnu.org</code>.
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</p>
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</dd>
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<dt><samp>zlib</samp></dt>
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<dd><p>The <code>zlib</code> compression library, used by the Java front end, as
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part of the Java runtime library, and for compressing and uncompressing
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GCC’s intermediate language in LTO object files.
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</p></dd>
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</dl>
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<p>The build system in the top level directory, including how recursion
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into subdirectories works and how building runtime libraries for
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multilibs is handled, is documented in a separate manual, included
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with GNU Binutils. See <a href="../configure/index.html#Top">GNU configure and build system</a> in <cite>The GNU configure and build system</cite>, for details.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="gcc-Directory.html#gcc-Directory" accesskey="n" rel="next">gcc Directory</a>, Previous: <a href="Configure-Terms.html#Configure-Terms" accesskey="p" rel="prev">Configure Terms</a>, Up: <a href="Source-Tree.html#Source-Tree" accesskey="u" rel="up">Source Tree</a> [<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>
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