Meaty Skeleton: Difference between revisions
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== System Root == |
== System Root == |
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Normally when you compile programs for your local operating system, the compiler |
Normally when you compile programs for your local operating system, the compiler locates development files such as headers and libraries in system directories such as: |
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:<tt>/usr/include</tt> |
:<tt>/usr/include</tt> |
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:<tt>/usr/lib</tt> |
:<tt>/usr/lib</tt> |
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These files are of course not usable for your operating system. Instead you |
These files are of course not usable for your operating system. Instead you want to have your own version of these directories that contains files for your operating system: |
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:<tt>/home/bwayne/myos/sysroot/usr/include</tt> |
:<tt>/home/bwayne/myos/sysroot/usr/include</tt> |
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The special <tt>__is_myos_kernel</tt> macro lets the source code detect whether |
The special <tt>__is_myos_kernel</tt> macro lets the source code detect whether |
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it is |
it is part of the kernel. |
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The kernel is built with <tt>-fbuiltin</tt>, which promises that the C standard |
The kernel is built with <tt>-fbuiltin</tt>, which promises that the C standard |
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The special <tt>__is_myos_libc</tt> macro lets the source code detect whether |
The special <tt>__is_myos_libc</tt> macro lets the source code detect whether |
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it is |
it is part of the libc. |
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This example comes with a small number of standard functions that serve as |
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examples and serve to satisfy ABI requirements. Note that the <tt>printf</tt> |
examples and serve to satisfy ABI requirements. Note that the <tt>printf</tt> |
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function included is very minimal and doesn't handle |
function included is very minimal and doesn't handle most common features, this |
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is intentional. |
is intentional. |
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---> |
---> |
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You can easily download the source code using |
You can easily download the source code using [[git]] from the [https://gitorious.org/sortie/meaty-skeleton/ Meaty Skeleton git repository]. This is preferable to doing a manual error-prone copy, as you may make mistake or whitespace gets garbled due to bugs in our syntax highlighting. To clone the git repository, do: |
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<source lang="bash"> |
<source lang="bash"> |
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