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  1. 

  2.   uClibc - a Small C Library for Linux
    3. 

  3.   Erik Andersen <andersen@codepoet.org>
    4. 

  4. 

  5. uClibc (aka µClibc/pronounced yew-see-lib-see) is a size-optimized
    6. 

  6. implementation of the standard C library.  It is primarily designed
    7. 

  7. for developing embedded Linux systems.  It is much smaller then the
    8. 

  8. GNU C Library, but nearly all applications supported by glibc also
    9. 

  9. work perfectly with uClibc. Porting applications from glibc to
    10. 

  10. uClibc typically involves just recompiling the source code. uClibc
    11. 

  11. even supports shared libraries and threading. It currently runs on
    12. 

  12. standard Linux and MMU-less (also known as µClinuxClinux) systems
    13. 

  13. with support for ARM, i386, h8300, m68k, mips, mipsel, PowerPC, SH,
    14. 

  14. SPARC, and v850 processors.
    15. 

  15. 

  16. For installation instructions, see the file INSTALL.
    17. 

  17. 

  18. This distribution contains a wrapper for gcc and ld that allows you
    19. 

  19. to use existing toolchains that were targetted for glibc.  See
    20. 

  20. extra/gcc-uClibc/ for information.
    21. 

  21. 

  22. uClibc strives to be standards compliant, which means that most
    23. 

  23. documentation written for functions in glibc also apply to uClibc
    24. 

  24. functions.  However, many GNU extensions are not supported because
    25. 

  25. they have not been ported, or more importantly, would increase the
    26. 

  26. size of uClibc disproportional to the added functionality.
    27. 

  27. 

  28. Additional information (recent releases, FAQ, mailing list, bugs,
    29. 

  29. etc.) can be found at http://www.uclibc.org/.
    30. 

  30. 

  31. uClibc may be freely modified distributed under the terms of the
    32. 

  32. GNU Library General Public License, which can be found in the
    33. 

  33. file COPYING.LIB.
    34. 

  34. 

  35. Please Note:
    36. 

  36. 

  37. 	There is an unwholesomely huge amount of code out there
    38. 

  38. 	that depends on the presence of GNU libc header files.
    39. 

  39. 	We have GNU libc header files.  So we have committed a
    40. 

  40. 	horrible sin in uClibc.  We _lie_ and claim to be GNU
    41. 

  41. 	libc in order to force these applications to work as their
    42. 

  42. 	developers intended.  This is IMHO, pardonable, since
    43. 

  43. 	these defines are not really intended to check for the
    44. 

  44. 	presence of a particular library, but rather are used to
    45. 

  45. 	define an _interface_.  Some programs (such as GNU
    46. 

  46. 	binutils) are especially chummy with glibc, and need this
    47. 

  47. 	behavior disabled by adding CFLAGS+=__FORCE_NOGLIBC
    48. 

  48.