-* Configuration:
+ uClibc - a small libc implementation
+ Erik Andersen <erik@codepoet.org>
- ln -s ./extra/Configs/Config.<arch> ./Config
-Then edit ./Config for your setup. In particular, modify CROSS and
-KERNEL_SOURCE as necessary. You may also want to modify
-SHARED_LIB_LOADER_PATH, DEVEL_PREFIX, and SYSTEM_DEVEL_PREFIX depending
-on where you want to install the development environment. By default,
-the development environment is installed into /usr/<arch>-linux-uclibc/.
+uClibc (aka µClibc/pronounced yew-see-lib-see) is size-optimized
+implementation of the standard C library. The primary use is
+for developing embedded Linux systems. It is much smaller then
+the GNU C Library (glibc), but nearly all applications supported
+by glibc also compile and work perfectly with uClibc. Porting
+applications from glibc to uClibc typically involves just
+recompiling the source code. uClibc even supports shared
+libraries and threading. It currently runs on standard Linux
+and MMU-less Linux (also known as µClinux) systems on the
+following processors: ARM, i386, h8300, m68k, mips, mipsel,
+PowerPC, SH, SPARC, and v850.
+For installation instructions, see the file INSTALL.
-* Building:
+This distribution contains a wrapper for gcc and ld that allows
+you to use existing toolchains that were targetted for glibc.
+See extra/gcc-uClibc/ for information.
- make
+uClibc strives to be standards compliant, which means that most
+documentation written for functions in glibc also apply to uClibc
+functions. However, many GNU extensions are not supported
+because they have not been ported, or more importantly, would
+increase the size of uClibc disproportional to the added
+functionality.
+Additional information (recent releases, FAQ, mailing list, bugs,
+etc.) can be found at http://www.uclibc.org/.
-* Installing the development environment:
+uClibc may be freely modified distributed under the terms of the
+GNU Library General Public License, which can be found in the
+file COPYING.LIB.
-(As root, if necessary,)
- make install
-
-This will install the header files, libraries, and the gcc
-wrapper into the directories defined in Config.
-
-
-* Installing the target runtime environment:
-
-(As root, if necessary,)
-
- make PREFIX=<temporary path> install_target
-
-This installs only the files that are necessary to run binaries
-compiled against uClibc. Hint: You probably do not want to install
-the target runtime environment on your host machine.
-
-
-* Using uClibc:
-
-To compile programs with uClibc,
-
- export PATH={uClibc DEVEL_PREFIX}/bin:$PATH
-
-and then just ./configure and make as usual.
-
-Note:
-
- You may also want to look at extra/gcc-uclibc/gcc-uclibc.c for
- additional information concerning what options and environment
- variables the gcc wrapper handles.
-
-Note2:
-
- There is an unwholesomely huge amount of code out there that
- depends on the presence of GNU libc header files. We have GNU
- libc header files. So we have committed a horrible sin in
- uClibc. We _lie_ and claim to be GNU libc in order to force
- many applications to work as their developers intended. This
- is IMHO, pardonable, since these defines are not really
- intended to check for the presence of a particular library, but
- rather are used to define an _interface_. Some programs (such
- as GNU binutils) are especially chummy with glibc, and need
- this behavior disabled by adding CFLAGS+=-D__FORCE_NOGLIBC
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