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<P>我们输出如下的环境变量方便我们编译。</P><BR><B><BR><PRE><CODE class=section>
<FONT face="Lucida Console">$export PRJROOT=/home/liang/embedded
$export TARGET=arm-linux
$export PREFIX=$PRJROOT/tools
$export TARGET_PREFIX=$PREFIX/$TARGET
$export PATH=$PREFIX/bin:$PATH
</FONT></CODE></PRE><BR>
<P>如果你不惯用环境变量的，你可以直接用绝对或相对路径。我如果不用环境变量，一般都用绝对路径，相对路径有时会失败。环境变量也可以定义在.bashrc文件中，这样当你logout或换了控制台时，就不用老是export这些变量了。</P>
<P>体系结构和你的TAEGET变量的对应如下表</P><BR><B><BR><IMG height=332 alt=""
src="嵌入式开发建立交叉编译环境[转]4.files/20051111215618998.gif" width=580
border=0><BR>
<P>你可以在通过glibc下的config.sub脚本来知道，你的TARGET变量是否被支持，例如：</P><BR><B><BR><PRE><CODE class=section>
<FONT face="Lucida Console">$./config.sub arm-linux
arm-unknown-linux-gnu
</FONT></CODE></PRE><BR>
<P>在我的环境中，config.sub 在 glibc-2.2.3/scripts 目录下。</P>
<P>网上还有一些 HOWTO 可以参考，ARM 体系结构的《The GNU Toolchain for ARM Target
HOWTO》，PowerPC 体系结构的《Linux for PowerPC Embedded Systems
HOWTO》等。对TARGET的选取可能有帮助。</P>
<P>4. 建立编译目录</P< p>
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