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<a name="1147848"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.2 st20cc</font>
</h2><hr>
<h3>
<a name="1147327"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.2.1 Changes from R1.9 to R2.0</font>
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<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1147334"> </a>C++ changes, see <a href="changes4.htm#1143240"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Section燘.3</i></font></a>,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1148338"> </a>Template placement is now possible using regular expressions.</font></p>
</ul>
<h3>
<a name="1142955"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.2.2 Changes from R1.8.1 to R1.9</font>
</h3>
<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142957"> </a>Linux hosts are supported.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142958"> </a>Time-logging is supported, with the option <font size=2 face=Courier><strong>-debug-runtime</strong></font>.</font></p>
</ul>
<h3>
<a name="1142959"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.2.3 Changes from R1.8 to R1.8.1</font>
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<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142961"> </a>By default, <strong>st20cc</strong> now passes command line options to sub-tools (for example, the compiler and the linker) in the order that they appear on the <strong>st20cc</strong> command line. For backwards compatibility, the new <strong>st20cc</strong> option <font size=2 face=Courier><strong>-V18-cmdline-order</strong></font> applies options in the order they would have been applied in earlier toolsets.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142962"> </a>Three other new options are provided as follows:</font></p>
<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142963"> </a><font size=2 face=Courier><strong>-funroll-loops=</strong></font><font face="Verdana, Arial, Helvetica, sans-serif"><i>n</i></font> to turn on loop unrolling;</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142964"> </a><font size=2 face=Courier><strong>-place-exact</strong></font> to force the linker to place sections in the order in which they appear in the configuration (<font size=2 face=Courier><strong>.cfg</strong></font>) file;</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142965"> </a><font size=2 face=Courier><strong>-warn-unused</strong></font> to warn of unused variables and functions.</font></p>
</ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142966"> </a><font size=2 face=Courier><strong>ST_device</strong></font> may now apply to either a pointer or an object, which can be a <font size=2 face=Courier><strong>struct</strong></font>. </font></p>
</ul>
<h3>
<a name="1142967"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">B.2.4 Changes from R1.7 to R1.8</font>
</h3>
<ul>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142969"> </a>New and modified command line options for C++ supersede those provided for earlier releases.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142975"> </a>Tentative variables have been implemented. These are essentially "common" variables shared between files. This does not create a back compatibility problem, but should be noted carefully as file scope variables not marked static will be potential candidates for "common".</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142977"> </a><font size=2 face=Courier><strong>-wc</strong></font> command line option suppresses warnings about nested comments.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142978"> </a><strong>st20cc</strong> can now be configured by the end user to allow additional flags to be passed between the driver and the separate tools driven by <strong>st20cc</strong>. This is done using the <font size=2 face=Courier><strong>st20cc.cfg</strong></font> configuration file. The new <strong>st20cc</strong> command line supports an option, as described in the <em>ST20 Embedded Toolset User Manual</em>, chapter <em>st20cc compile/link tool</em>.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142982"> </a>The file extensions associated with each tool may also be set in the <font size=2 face=Courier><strong>st20cc.cfg</strong></font> configuration file. See the <em>ST20 Embedded Toolset User Manual</em>, chapter <em>st20cc compile/link tool</em>.</font></p>
</ul>
<p>
<a name="1142988"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Other new command line options are listed in <a href="changes3.htm#1143026"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Table⌨️ 快捷键说明
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