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6.2 Top Level Source Directory

The top level source directory in a GCC distribution contains several files and directories that are shared with other software distributions such as that of GNU Binutils. It also contains several subdirectories that contain parts of GCC and its runtime libraries:

boehm-gc
The Boehm conservative garbage collector, used as part of the Java runtime library.
contrib
Contributed scripts that may be found useful in conjunction with GCC. One of these, contrib/texi2pod.pl, is used to generate man pages from Texinfo manuals as part of the GCC build process.
fastjar
An implementation of the jar command, used with the Java front end.
fixincludes
The support for fixing system headers to work with GCC. See fixincludes/README for more information. The headers fixed by this mechanism are installed in libsubdir/include-fixed. Along with those headers, README-fixinc is also installed, as libsubdir/include-fixed/README.
gcc
The main sources of GCC itself (except for runtime libraries), including optimizers, support for different target architectures, language front ends, and testsuites. See The gcc Subdirectory, for details.
include
Headers for the libiberty library.
intl
GNU libintl, from GNU gettext, for systems which do not include it in libc.
libada
The Ada runtime library.
libcpp
The C preprocessor library.
libgfortran
The Fortran runtime library.
libffi
The libffi library, used as part of the Java runtime library.
libiberty
The libiberty library, used for portability and for some generally useful data structures and algorithms. See Introduction (gnu libiberty), for more information about this library.
libjava
The Java runtime library.
libmudflap
The libmudflap library, used for instrumenting pointer and array dereferencing operations.
libobjc
The Objective-C and Objective-C++ runtime library.
libstdc++-v3
The C++ runtime library.
maintainer-scripts
Scripts used by the gccadmin account on gcc.gnu.org.
zlib
The zlib compression library, used by the Java front end and as part of the Java runtime library.

The build system in the top level directory, including how recursion into subdirectories works and how building runtime libraries for multilibs is handled, is documented in a separate manual, included with GNU Binutils. See GNU configure and build system (The GNU configure and build system), for details.