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<a name="1204921"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">12.3.1 Defining a macro on the command line</font>
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<a name="1204922"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The <font face="Verdana, Arial, Helvetica, sans-serif"><b>D</b></font> option enables a macro to be defined on the <strong>st20cc</strong> command line, which is passed through to the compiler:</font>
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<a name="1204923"> </a><font size=2 face=Courier><strong>-D <font size=2 face=Courier><strong><em>name</em></strong></font>[=<font size=2 face=Courier><strong><em>value</em></strong></font>]<br></strong></font>
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<a name="1204924"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If <font size=2 face=Courier><strong><em>value</em></strong></font> is specified then <font size=2 face=Courier><strong><em>name</em></strong></font> is defined and assigned that value.</font>
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<a name="1207102"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">When <font size=2 face=Courier><strong><em>value</em></strong></font> is a string, the host operating system removes quotes from the command line. In order for the string to be passed correctly through to the source code, quotation marks must be preceded by a backslash (<font size=2 face=Courier><strong>\</strong></font>) character. <font size=2 face=Courier><strong>"foo"</strong></font> would therefore be expressed as <font size=2 face=Courier><strong>\"foo\"</strong></font>.</font>
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<a name="1207104"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The<font size=2 face=Courier><strong> </strong></font><font face="Verdana, Arial, Helvetica, sans-serif"><b>U</b></font> option disables a name definition and the <font face="Verdana, Arial, Helvetica, sans-serif"><b>EDU</b></font> option forces processing of any <font face="Verdana, Arial, Helvetica, sans-serif"><b>D</b></font> defines prior to <font face="Verdana, Arial, Helvetica, sans-serif"><b>U</b></font> undefines. By default interpretation of the <font face="Verdana, Arial, Helvetica, sans-serif"><b>D</b></font> and <font face="Verdana, Arial, Helvetica, sans-serif"><b>U</b></font> options is performed in command line order.</font>
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<h5>
<a name="1204933"> </a><i><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Example</font></i>
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<a name="1204934"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">In order for <strong>st20cc</strong> to pass the string <font size=2 face=Courier><strong>"FRED BILL"</strong></font> to the source code <font size=2 face=Courier><strong>myprog.c</strong></font> then the <font face="Verdana, Arial, Helvetica, sans-serif"><b>D</b></font> option could be expressed as follows:</font>
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<a name="1204935"> </a><font size=2 face=Courier><strong>st20cc myprog.c -DSTRING="\"FRED BILL\"" -c1 -T myprog.cfg<br></strong></font>
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