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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.
config
Autoconf macros and Makefile fragments used throughout the tree.
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.
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.
gnattools
Support tools for GNAT.
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.
libatomic
The runtime support library for atomic operations (e.g. for __sync and __atomic).
libcpp
The C preprocessor library.
libdecnumber
The Decimal Float support library.
libffi
The libffi library, used as part of the Java runtime library.
libgcc
The GCC runtime library.
libgfortran
The Fortran runtime library.
libgo
The Go runtime library. The bulk of this library is mirrored from the master Go repository.
libgomp
The GNU OpenMP runtime library.
libiberty
The libiberty library, used for portability and for some generally useful data structures and algorithms. See Introduction, for more information about this library.
libitm
The runtime support library for transactional memory.
libjava
The Java runtime library.
libobjc
The Objective-C and Objective-C++ runtime library.
libquadmath
The runtime support library for quad-precision math operations.
libssp
The Stack protector runtime library.
libstdc++-v3
The C++ runtime library.
lto-plugin
Plugin used by the linker if link-time optimizations are enabled.
maintainer-scripts
Scripts used by the gccadmin account on gcc.gnu.org.
zlib
The zlib compression library, used by the Java front end, as part of the Java runtime library, and for compressing and uncompressing GCC's intermediate language in LTO object files.

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, for details.