为了尝试编译FreePascal，我搜了官方文档，并给几位作者都发了邮件询问，目前结果如下：
http://wiki.lazarus.freepascal.org/Getting_Lazarus#Compiling_and_installing_FPC
http://wiki.maemo.org/Compile_FreePascal_on_device
http://www.michellcomputing.co.uk/blog/2014/05/freepascal-2-7-1-on-raspberry-pi/
http://lazarus.developpez.com/cours/installation/svn-ubuntu-debian/
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Go to
1) www.freepascal.org
2) click "documentation"
3) click "more inforamtion"
4) click "building faq"
Marco van de Voort
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The programmers' guide contains a chapter on how to compile the sources.
You can find it online in:
http://www.freepascal.org/docs-html/prog/progap6.html#x326-341000F
There is also the buildfaq which treats the same subject. You can find the latter on:
http://www.stack.nl/~marcov/buildfaq.pdf
I hope this helps you.
Michael Van Canneyt
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仔细观察后发现fpc其实只是一个中间工具用来运行对应平台的编译器的
在fpcsrc中的compiler中有几个 .lpi的lazarus工程，有对应cpu的工程文件，编译出来的就是fpc的编译器