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141 lines
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<html lang="en">
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<head>
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<title>Top Level - GNU Compiler Collection (GCC) Internals</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Source-Tree.html#Source-Tree" title="Source Tree">
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<link rel="prev" href="Configure-Terms.html#Configure-Terms" title="Configure Terms">
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<link rel="next" href="gcc-Directory.html#gcc-Directory" title="gcc Directory">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Funding Free Software'', the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development.-->
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<div class="node">
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<a name="Top-Level"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="gcc-Directory.html#gcc-Directory">gcc Directory</a>,
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Previous: <a rel="previous" accesskey="p" href="Configure-Terms.html#Configure-Terms">Configure Terms</a>,
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Up: <a rel="up" accesskey="u" href="Source-Tree.html#Source-Tree">Source Tree</a>
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<hr>
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</div>
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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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<dl>
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<dt><samp><span class="file">boehm-gc</span></samp><dd>The Boehm conservative garbage collector, used as part of the Java
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runtime library.
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<br><dt><samp><span class="file">config</span></samp><dd>Autoconf macros and Makefile fragments used throughout the tree.
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<br><dt><samp><span class="file">contrib</span></samp><dd>Contributed scripts that may be found useful in conjunction with GCC.
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One of these, <samp><span class="file">contrib/texi2pod.pl</span></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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<br><dt><samp><span class="file">fixincludes</span></samp><dd>The support for fixing system headers to work with GCC. See
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<samp><span class="file">fixincludes/README</span></samp> for more information. The headers fixed by
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this mechanism are installed in <samp><var>libsubdir</var><span class="file">/include-fixed</span></samp>.
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Along with those headers, <samp><span class="file">README-fixinc</span></samp> is also installed, as
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<samp><var>libsubdir</var><span class="file">/include-fixed/README</span></samp>.
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<br><dt><samp><span class="file">gcc</span></samp><dd>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 <samp><span class="file">gcc</span></samp> Subdirectory</a>, for details.
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<br><dt><samp><span class="file">gnattools</span></samp><dd>Support tools for GNAT.
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<br><dt><samp><span class="file">include</span></samp><dd>Headers for the <code>libiberty</code> library.
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<br><dt><samp><span class="file">intl</span></samp><dd>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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<br><dt><samp><span class="file">libada</span></samp><dd>The Ada runtime library.
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<br><dt><samp><span class="file">libatomic</span></samp><dd>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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<br><dt><samp><span class="file">libcpp</span></samp><dd>The C preprocessor library.
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<br><dt><samp><span class="file">libdecnumber</span></samp><dd>The Decimal Float support library.
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<br><dt><samp><span class="file">libffi</span></samp><dd>The <code>libffi</code> library, used as part of the Java runtime library.
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<br><dt><samp><span class="file">libgcc</span></samp><dd>The GCC runtime library.
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<br><dt><samp><span class="file">libgfortran</span></samp><dd>The Fortran runtime library.
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<br><dt><samp><span class="file">libgo</span></samp><dd>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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<br><dt><samp><span class="file">libgomp</span></samp><dd>The GNU Offloading and Multi Processing Runtime Library.
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<br><dt><samp><span class="file">libiberty</span></samp><dd>The <code>libiberty</code> library, used for portability and for some
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generally useful data structures and algorithms. See <a href="../libiberty/index.html#Top">Introduction</a>, for more information
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about this library.
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<br><dt><samp><span class="file">libitm</span></samp><dd>The runtime support library for transactional memory.
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<br><dt><samp><span class="file">libjava</span></samp><dd>The Java runtime library.
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<br><dt><samp><span class="file">libobjc</span></samp><dd>The Objective-C and Objective-C++ runtime library.
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<br><dt><samp><span class="file">libquadmath</span></samp><dd>The runtime support library for quad-precision math operations.
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<br><dt><samp><span class="file">libssp</span></samp><dd>The Stack protector runtime library.
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<br><dt><samp><span class="file">libstdc++-v3</span></samp><dd>The C++ runtime library.
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<br><dt><samp><span class="file">lto-plugin</span></samp><dd>Plugin used by the linker if link-time optimizations are enabled.
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<br><dt><samp><span class="file">maintainer-scripts</span></samp><dd>Scripts used by the <code>gccadmin</code> account on <code>gcc.gnu.org</code>.
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<br><dt><samp><span class="file">zlib</span></samp><dd>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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</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>, for details.
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</body></html>
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