envtarget.html

来自「tinyos中文手册,是根据tinyos系统自带手册翻译过来的,虽然质量不好,但」· HTML 代码 · 共 50 行

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<html><head><title>env target and nesc1</title></head><body>The <tt>env</tt> target allows the nesC compiler to be configured for a newplatform without requiring source code changes. It allows specification ofa target's data layout rules and the name of it's gcc compiler. It cannotbe passed directly to <tt>ncc</tt>.<blockquote>If <tt>env</tt> is specified as the target to <tt>nesc1</tt>, the compilation usesa machine specification described in the environment variable<tt>NESC_MACHINE</tt>, such as <blockquote><tt>exportNESC_MACHINE="long_double=8,4 gcc=some-other-gcc"</tt></blockquote> Aparticular order to the keynames in <tt>NESC_MACHINE</tt> is not necessary.The table below is a complete list of possible key names for<tt>NESC_MACHINE</tt>, a short description of their values, and theirdefault if unspecified: <blockquote><table border=1 cellpadding=2 cellspacing=0><tr><th>Keyname                   <th>Value      <th>Default<tr><td>pcc_bitfield_type_matters <td>bool       <td>false<tr><td>pointer                   <td>size,align <td>2,1<tr><td>float                     <td>size,align <td>4,1<tr><td>double                    <td>size,align <td>4,1<tr><td>long_double               <td>size,align <td>4,1<tr><td>short                     <td>size,align <td>2,1<tr><td>int                       <td>size,align <td>2,1<tr><td>long                      <td>size,align <td>4,1<tr><td>long_long                 <td>size,align <td>8,1<tr><td>int1248_align             <td>align,align,align,align <td>1,1,1,1<tr><td>wchar_size_size           <td>size,size  <td>2,2<tr><td>char_wchar_signed         <td>bool,bool  <td>true,true<tr><td>gcc                       <td>string (no spaces) <td>gcc</table></blockquote>For reference and easy cut+paste, here is the full default specification for<tt>NESC_MACHINE</tt>: <blockquote><tt>exportNESC_MACHINE="pcc_bitfield_type_matters=false pointer=2,1 float=4,1double=4,1 long_double=4,1 short=2,1 int=2,1 long=4,1 long_long=8,1int1248_align=1,1,1,1 wchar_size_size=2,2 char_wchar_signed=true,truegcc=gcc"</tt></blockquote></body></html>

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