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<title>Building C/C++ projects</title>
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<h1>Building C/C++ projects</h1>
<p>The CDT relies on an external mae utility, such as GNU make, to build a project.
The CDT can generate makefiles automatically when you create a Managed Make C project or a Managed Make C++ project.
You have the option of creating a Standard Make C project or a Standard Make C++ project and providing the makefile.</p>
<h2>Required utilities</h2>
<p>You must install and configure the following utilities:</p>
<ul>
<li>Build (such as <tt>make</tt>).</li>
<li>Compile (such as gcc). For more information, see <a href="http://gcc.gnu.org">http://gcc.gnu.org</a>.</li>
<li>Debug (such as gdb). For more information, see <a href="http://sources.redhat.com/gdb/">http://sources.redhat.com/gdb/</a>.</li>
</ul>
<p><b>Tip: </b>Cygwin contains these utilities for a Windows environment, while running the cygwin installation ensure <tt>gcc</tt> and <tt>make</tt> are selected, they are not installed by default.
For more information, see <a href="http://www.cygwin.com">http://www.cygwin.com</a>. Red Hat users, all you need to build your project is included in the Red Hat Linux installation.
For other operating systems please refer to your installation documentation.</p>
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<h2>Build terminology</h2>
<p>The CDT uses a number of terms to describe the scope of the build. </p>
<h3>Build Project</h3>
<p>This is an incremental build (make all, assuming all is defined in your makefile). Only the components affected by modified files in that particular project are built.</p>
<h3>Rebuild Project</h3>
<p>Builds every file in the project whether or not a file has been modified since the last build. A rebuild is a clean followed by a build.</p>
<p>For more information on builds, see:</p>
<ul>
<li><b>Workbench User Guide &gt; Concepts &gt; Workbench &gt; Builds</b></li>
<li><b>Workbench User Guide &gt; Tasks &gt; Building resources</b></li>
</ul>
<p>Build-related information is displayed as follows:</p>
<ul>
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<li>The Console view displays the output of the make utility.</li>
<li>The Tasks view displays a list of compiler errors and warnings related to your projects.</li>
<li>Makefile targets are displayed in the Make Targets view.</li>
</ul>
<p>For more information about the Tasks view, see <b>Workbench User Guide &gt; Reference &gt; User interface information &gt; Views and editors &gt; Tasks view</b>.</p>
<h2>Getting a makefile</h2>
<p>You can either create a C project for which you supply the <b>makefile</b> or create a C project for which the CDT generates makefiles automatically.</p>
<p>To create a new project, from the menu bar choose <b>File > New > Project</b>. In the dialog that appears:</p>
<ul>
<li>To create a project for which you supply the <b>makefile</b>, select either <b>Standard Make C project</b> or <b>Standard Make C++ project</b>. </li>
<li>To create a project for which the CDT supplies a basic <b>makefile</b>, select either <b>Managed Make C project</b> or <b>Managed Make C++ project</b>. </li>
</ul>
<h2>Setting build preferences</h2>
<p>You can set build preferences in Eclipse:</p>
<dl>
<dt>Build order</dt>
<dd>If certain projects must be built before others, you can set the <i>build order</i>.
If your project refers to another project, the CDT must build the other project first.
To set the build order, from the menu bar select <b>Window &gt; Preferences &gt; Build Order</b>.
<p>When you set the build order, the CDT does not rebuild projects that depend on a project;
you must rebuild all projects to ensure all changes are propagated.</p></dd>
<dt>Automatic save</dt>
<dd>You can set the CDT to perform an <i>automatic save</i> of all modified resources when you perform a manual build;
from the menu bar, select <b>Windows &gt; Preferences &gt; Workbench</b>.By default, this feature is enabled.</dd>
</dl>
<h2>Controlling the building of your project</h2>
<p>The C/C++ compiler that a project uses is controlled by the project's <b>Properties</b> setting.
To view a project's properties, right-click on the project and select <b>Properties</b>.
In the dialog that appears, the <b>C/C++ Make Project</b> page enables you to control a variety of settings, including:</p>
<dl>
<dt>Build Setting</dt>
<dd>Controls whether the compiler will <b>Stop On Error</b>or <b>Keep Going On Error</b>.
Choosing <b>Keep Going On Error</b> will force the compiler to attempt to build all referenced projects even if the current project has errors.</dd>
<dt>Build Command</dt>
<dd>Controls which make is used.</dd>
<dt>Workbench Build Behavior</dt>
<dd>Controls which makefile target will be built depending on the scope of the build.</dd>
</dl>
<h2>Viewing build information</h2>
<p>Build-related information is displayed as follows: </p>
<ul>
<li>The <b>Console</b> view displays the output of the make utility.</li>
<li>The <b>Tasks</b> view displays a list of compiler errors and warnings related to your projects. </li>
<li>Build actions display in the <b>Make Targets</b> view.</li>
</ul>
<p><img border="0" src="../images/ngconcepts.gif" ALT="Related concepts" width="143" height="21">
<br>
<a href="cdt_c_projects.htm">CDT Projects</a><br>
<a href="cdt_c_proj_file_views.htm">Project file views</a></p>
<p><img border="0" src="../images/ngtasks.gif" ALT="Related tasks" width="143" height="21">
<br>
<a href="../tasks/cdt_o_proj_prop.htm">Defining project properties</a><br>
<a href="../tasks/cdt_o_build_task.htm">Building</a></p>
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