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  <a name="1142971"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">C.1 	 Object file compatibility</font>
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  <a name="1142972"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Object files (that is, <font size=2 face=Courier><strong>.tco</strong></font> files and library files) have been generally backward compatible since version R1.5.1, and R1.5 if the object file does not explicitly place data in sections, with the exceptions described in the remainder of this chapter. Linked <font size=2 face=Courier><strong>.lku</strong></font> files are not compatible, so any programs booted from the host using <strong>st20run</strong> will need to be linked again.</font>
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  <a name="1142973"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">In this context, backward compatibility means that:</font>
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<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142974"> </a><font size=2 face=Courier><strong>.tco</strong></font> and library files can be safely linked without needing a new compilation. </font></p>
<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142975"> </a>Object files and libraries generated with old versions of the toolset can be linked by newer ones, and files generated by the newer toolset can be linked by older toolsets. </font></p>
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