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<hr><p align="left"><small>发信人: plato (纯真年代), 信区: Embedded <br>

标  题: linux for ppc 12 <br>

发信站: BBS 水木清华站 (Wed May 30 23:18:13 2001) <br>

  <br>

Next Previous Contents <br>

---------------------------------------------------------------------------- <br>

---- <br>

12. Runtime Library <br>

12.1 glibc <br>

http://www.gnu.org/software/libc/ and http://sources.redhat.com/glibc/ <br>

Modern releases of glibc are very large for a traditional embedded system. I <br>

f your application requires only one or two user programs, you can staticall <br>

y link them to avoid requiring the entire dynamic library. Another option is <br>

 to hand-strip the dynamic library to a bare minimum. <br>

The are some modifications required to official glibc-2.1.x releases to make <br>

 them work in the embedded PowerPC environment, such as cache line size mods <br>

. See: http://lists.linuxppc.org/listarcs/linuxppc-embedded/199909/msg00000. <br>

html <br>

After applying these mods, glibc-2.1.x can be configured for cross-compiling <br>

 with: <br>

    #!/bin/sh <br>

    export PATH=/path/to/local/i686-pc-linux-gnu/bin:$PATH <br>

    export CFLAGS="-msoft-float -O2 -DNDEBUG=1" <br>



    export CC=powerpc-linux-gcc <br>

    export AR=powerpc-linux-ar <br>

    export RANLIB=powerpc-linux-ranlib <br>

    configure --host=powerpc-linux --prefix=/path/to/local/powerpc-linux \ <br>

    --with-headers=/path/to/linux-2.2.13/include --enable-add-ons=linuxthrea <br>

ds \ <br>

    --with-gnu-as --with-gnu-ld --disable-sanity-checks --without-fp <br>

There is a magic script named mklibs.sh which removes unused functions from <br>

the shared C library in the Debian Boot Floppies package, at: ftp://ftp.us.d <br>

ebian.org/debian/dists/potato/main/source/admin/boot-floppies_2.2.16.tar.gz <br>

12.2 sglibc <br>

http://sourceforge.net/projects/sglibc and http://external-lists.varesearch. <br>

com/lists/listinfo/sglibc <br>

This is an attempt to produce a small glibc-compatible C runtime library sub <br>

set suitable for embedded systems. <br>

To cut down some of the bloat in glibc, apply the patches at: http://externa <br>

l-lists.varesearch.com/archives/sglibc/1999-September/000007.html ftp://ftp. <br>

valinux.com/pub/support/hjl/glibc/glibc-old_version.tar.gz <br>

12.3 uClibc <br>

http://opensource.lineo.com/cgi-bin/cvsweb/uClibc/ <br>

uC-Libc is a C library for embedded systems developed originally for uClinux <br>

, and now being ported to other architectures including PowerPC. It has a di <br>



fferent set of design goals from GNU libc, but for many embedded systems it <br>

is a sensible choice. <br>

12.4 dietlibc <br>

http://www.fefe.de/dietlibc/ <br>

This project aims to make it easy to create small statically linked programs <br>

 under Linux. <br>

12.5 newlib <br>

http://sources.redhat.com/newlib/ <br>

Newlib is a free C library intended for use on embedded systems, with less r <br>

estrictive licensing than the GPL. However, it currently lacks the libgloss <br>

layer necessary to use it as the C library under Linux. <br>

12.6 libc5 <br>

Older Linux libc's are often quite small, but generally not supported by any <br>

one now. <br>

---------------------------------------------------------------------------- <br>

---- <br>

Next Previous Contents <br>

  <br>

-- <br>

  <br>

※ 来源:·BBS 水木清华站 smth.org·[FROM: 166.111.161.8] <br>

</small><hr>
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