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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Building C/C++ projects</title>
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<link rel="stylesheet" type="text/css" href="../help.css">
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</head>
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<body>
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<h1>Building C/C++ projects</h1>
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<p>The CDT relies on an external make utility, such as GNU make, to
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build a project. The CDT can generate makefiles automatically when you
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create a Managed Make C project or a Managed Make C++ project. You have
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the option of creating a Standard Make C project or a Standard Make C++
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project and providing the makefile yourself.</p>
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<h2>Required utilities</h2>
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<p>You must install and configure the following utilities:
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</p>
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<ul>
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<li>Build (e.g. make).</li>
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<li>Compile (e.g. gcc).</li>
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<li>Debug (e.g. gdb).</li>
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</ul>
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<b>Note: </b> while make, gcc and gdb are the examples used in the
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documentation, virtually any similar set of tools or utilities could be
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used.
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<p></p>
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<p><b>Tip: </b>Cygwin contains these utilities (make, gcc and gdb) for
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a Windows environment. While running the cygwin installation,
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ensure <tt>gcc</tt> and <tt>make</tt> are selected since they are not
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installed by default. For more information, see <a
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href="http://www.cygwin.com">http://www.cygwin.com</a>. If you are a
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Red Hat user, all that you need to do to build your project is included
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in the Red Hat Linux installation.
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For other operating systems, please refer to your installation
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documentation.</p>
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<p></p>
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<h2>Build terminology</h2>
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<p>The CDT uses a number of terms to describe the scope of the build. </p>
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<h3>Build Project</h3>
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<p>This is an incremental build (make all, assuming all is defined in
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your makefile). Only the components affected by modified files in that
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particular project are built.</p>
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<h3>Rebuild Project</h3>
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<p>Builds every file in the project whether or not a file has been
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modified since the last build. A rebuild is a clean followed by a build.</p>
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<p>For more information on builds, see:</p>
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<ul>
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<li><b>Workbench User Guide > Concepts > Workbench > Builds</b></li>
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<li><b>Workbench User Guide > Tasks > Building resources</b></li>
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</ul>
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<p>Build-related information is displayed as follows:</p>
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<ul>
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<li>The Console view displays the output of the build tools.</li>
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<li>The Tasks view displays a list of compiler errors and warnings
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related to your projects.</li>
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<li>For Standard Make projects, the Makefile targets are displayed in
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the Make Targets view.</li>
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</ul>
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<p>For more information about the Tasks view, see <b>Workbench User
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Guide > Reference > User interface information > Views and
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editors > Tasks view</b>.</p>
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<h2>Getting a makefile</h2>
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<p>You can either create a C/C++ project for which you supply the <b>makefile</b>
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or create a C/C++ project for which the CDT generates makefiles
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automatically.</p>
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<p>To create a new project, from the menu bar choose <b>File > New
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> Project</b>. In the dialog that appears, expand the C/C++ group
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and choose e.g. C Project</p>
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<ul>
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<li>In the resulting wizard page, to create a project for which you supply the <b>makefile</b>,
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select <b>Makefile project</b> and choose one of the alternatives under that.
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An empty project, or a simple "Hello World" can be created.
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You edit and manage the makefile yourself.
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<p> </p>
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</li>
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<li>To create a project for which the CDT supplies a basic <b>makefile</b>,
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select another project type, e.g. <b>Executable</b> and choose one of the examples
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under that, or choose <b>Empty Project</b>.
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</li>
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</ul>
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<h2>Setting build preferences</h2>
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<p>You can set build preferences in Eclipse:</p>
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<dl>
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<dt>Build order</dt>
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<dd>If certain projects must be built before others, you can set the <i>build
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order</i>. If your project refers to another project, the CDT must
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build the other project first. To set the build order, from the menu
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bar select <b>Window > Preferences</b> and choose <b> General > Preferences > Build Order</b>.
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<p>When you set the build order, the CDT does not rebuild projects
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that depend on a project; you must rebuild all projects to ensure all
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changes are propagated.</p>
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</dd>
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<dt>Automatic save</dt>
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<dd>You can set the CDT to perform an <i>automatic save</i> of all
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modified resources when you perform a manual build. In the preferences dialog,
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select <b>General > Workspace</b> and check <b>Save automatically before build</b>.
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By default,
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this feature is <i>not</i> enabled.</dd>
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</dl>
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<h2>Controlling the building of your project</h2>
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<p>For a Makefile project, the C/C++ compiler that a project uses
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is controlled by the project's <b>Properties</b> setting.
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To view a project's properties, right-click on the project and select <b>Properties</b>.
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In the dialog that appears, the <b>C/C++ Build</b>
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page enables you to control a variety of settings, including:</p>
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<dl>
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<dt>Build Command</dt>
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<dd>On the <b>Builder Settings</b> tab, this controls which <code>make</code> is used. To change it, uncheck <b>Use
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default build command</b> and change it or add arguments to the make command.</dd>
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<dt>Build Setting</dt>
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<dd>On the <b>Behaviour</b> tab, this controls whether the compiler will <b>Stop on first build error</b> or not
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(keep going). Unchecking <b>Stop on first build error</b> will force the compiler to attempt to build all referenced
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projects even if the current project has errors.</dd>
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<dt>Workbench Build Behavior</dt>
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<dd>On the <b>Behaviour </b> tab, this controls which makefile target will be built depending on the scope of the
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build, e.g. <code>all</code> or <code>clean</code>.</dd>
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</dl>
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<p>For a standard (non-Makefile) project (often called "Managed Build" or "Managed Make" project from
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earlier CDT version), the project properties dialog enables
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you to manage the build configurations of your project. For additional
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information see:</p>
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<ul>
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<li><b>Reference > C/C++ Properties > C/C++ Project Properties > Managed Make
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Projects</b></li>
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<li><b>Reference > C/C++ Properties > C/C++ Project Properties > Managed Make File
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Properties</b></li>
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</ul>
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<h2>Viewing build information</h2>
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<p>Build-related information is displayed as follows: </p>
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<ul>
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<li>The <b>Console</b> view displays the output of the make utility.</li>
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<li>The <b>Tasks</b> view displays a list of compiler errors and
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warnings related to your projects. </li>
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<li>For a Standard Make project, build actions display in the <b>Make
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Targets</b> view.</li>
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</ul>
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<p><img border="0" src="../images/ngconcepts.gif" alt="Related concepts"
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width="143" height="21">
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<br>
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<a href="cdt_c_projects.htm">CDT Projects</a><br>
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<a href="cdt_c_proj_file_views.htm">Project file views</a></p>
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<p><img border="0" src="../images/ngtasks.gif" alt="Related tasks"
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width="143" height="21">
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<br>
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<a href="../tasks/cdt_o_build_task.htm">Building projects</a></p>
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<p><img border="0" src="../images/ngref.gif" alt="Related reference"
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width="143" height="21">
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<br>
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<a href="../reference/cdt_u_properties.htm">Project Properties</a></p>
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<p><img src="../images/rh03_04.gif" alt="Red Hat Copyright Statement"><br>
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<img src="../images/ng00_04a.gif" alt="IBM Copyright Statement">
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</p>
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</body>
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</html>
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