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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="bbv2.vs_v1"></a>Differences to Boost.Build V1</h2></div></div></div> |
| <div class="toc"><dl> |
| <dt><span class="section"><a href="vs_v1.html#bbv2.overview.differences_to_v1.configuration">Configuration</a></span></dt> |
| <dt><span class="section"><a href="vs_v1.html#bbv2.overview.differences_to_v1.jamfiles">Writing Jamfiles</a></span></dt> |
| <dt><span class="section"><a href="vs_v1.html#bbv2.overview.differences_to_v1.build_process">Build process</a></span></dt> |
| </dl></div> |
| <p>While Boost.Build V2 is based on the same ideas as Boost.Build V1, |
| some of the syntax was changed, and some new important features were |
| added. This chapter describes most of the changes.</p> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="bbv2.overview.differences_to_v1.configuration"></a>Configuration</h3></div></div></div> |
| <p>In V1, toolsets were configured by environment variables. If you |
| wanted to use two versions of the same toolset, you had to create a new |
| toolset module that would set the variables and then invoke the base |
| toolset. In V2, toolsets are configured by the |
| <code class="computeroutput">using</code>, and you can easily configure several |
| versions of a toolset. See <a class="xref" href="overview.html#bbv2.overview.configuration" title="Configuration">the section called “Configuration”</a> for details. |
| </p> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="bbv2.overview.differences_to_v1.jamfiles"></a>Writing Jamfiles</h3></div></div></div> |
| <p>Probably one of the most important differences in V2 Jamfiles is |
| the use of project requirements. In V1, if several targets had the same |
| requirements (for example, a common <code class="computeroutput">#include</code> path), it was necessary to |
| manually write the requirements or use a helper rule or template target. In V2, the |
| common properties can be specified with the <code class="computeroutput">requirements</code> project |
| attribute, as documented in <a class="xref" href="overview.html#bbv2.overview.projects" title="Projects">the section called “Projects”</a>. |
| </p> |
| <p><a class="link" href="tutorial.html#bbv2.tutorial.libs" title="Dependent Targets">Usage requirements</a> |
| also help to simplify Jamfiles. |
| |
| If a library requires |
| all clients to use specific <code class="computeroutput">#include</code> paths or macros when compiling |
| code that depends on the library, that information can be cleanly |
| represented.</p> |
| <p>The difference between <code class="computeroutput">lib</code> and <code class="computeroutput">dll</code> targets in V1 is completely |
| eliminated in V2. There's only one library target type, <code class="computeroutput">lib</code>, which can create |
| either static or shared libraries depending on the value of the |
| <a class="link" href="reference.html#bbv2.overview.builtins.features.link"><code class="varname"><link></code> |
| feature</a>. If your target should be only built in one way, you |
| can add <code class="computeroutput"><link>shared</code> or <code class="computeroutput"><link>static</code> to its requirements. |
| </p> |
| <p>The syntax for referring to other targets was changed a bit. While |
| in V1 one would use: |
| </p> |
| <pre class="programlisting"> |
| exe a : a.cpp <lib>../foo/bar ; |
| </pre> |
| <p> |
| the V2 syntax is: |
| </p> |
| <pre class="programlisting"> |
| exe a : a.cpp ../foo//bar ; |
| </pre> |
| <p> |
| Note that you don't need to specify the type of other target, but the |
| last element should be separated from the others by a double slash to indicate that |
| you're referring to target <code class="filename">bar</code> in project <code class="filename">../foo</code>, and not to |
| project <code class="filename">../foo/bar</code>. |
| </p> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="bbv2.overview.differences_to_v1.build_process"></a>Build process</h3></div></div></div> |
| <p>The command line syntax in V2 is completely different. For example |
| </p> |
| <pre class="programlisting"> |
| bjam -sTOOLS=msvc -sBUILD=release some_target |
| </pre> |
| <p> |
| now becomes: |
| </p> |
| <pre class="programlisting"> |
| bjam toolset=msvc variant=release some_target |
| </pre> |
| <p> |
| or, using implicit features, just: |
| </p> |
| <pre class="programlisting"> |
| bjam msvc release some_target |
| </pre> |
| <p> |
| See <a class="link" href="overview.html#bbv2.overview.invocation" title="Invocation">the reference</a> for a |
| complete description of the syntax. |
| </p> |
| </div> |
| </div> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2006-2009 Vladimir Prus<p>Distributed under the Boost Software License, Version 1.0. |
| (See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at |
| <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
| </p> |
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