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| <div class="section" id="function"> |
| <span id="command:function"></span><h1>function<a class="headerlink" href="#function" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Start recording a function for later invocation as a command:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">function</span><span class="p">(</span><span class="o"><</span><span class="n">name</span><span class="o">></span> <span class="p">[</span><span class="n">arg1</span> <span class="p">[</span><span class="n">arg2</span> <span class="p">[</span><span class="n">arg3</span> <span class="o">...</span><span class="p">]]])</span> |
| <span class="n">COMMAND1</span><span class="p">(</span><span class="n">ARGS</span> <span class="o">...</span><span class="p">)</span> |
| <span class="n">COMMAND2</span><span class="p">(</span><span class="n">ARGS</span> <span class="o">...</span><span class="p">)</span> |
| <span class="o">...</span> |
| <span class="n">endfunction</span><span class="p">(</span><span class="o"><</span><span class="n">name</span><span class="o">></span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Define a function named <code class="docutils literal"><span class="pre"><name></span></code> that takes arguments named <code class="docutils literal"><span class="pre">arg1</span></code>, |
| <code class="docutils literal"><span class="pre">arg2</span></code>, <code class="docutils literal"><span class="pre">arg3</span></code>, (...). |
| Commands listed after function, but before the matching |
| <span class="target" id="index-0-command:endfunction"></span><a class="reference internal" href="endfunction.html#command:endfunction" title="endfunction"><code class="xref cmake cmake-command docutils literal"><span class="pre">endfunction()</span></code></a>, are not invoked until the function is invoked. |
| When it is invoked, the commands recorded in the function are first |
| modified by replacing formal parameters (<code class="docutils literal"><span class="pre">${arg1}</span></code>) with the arguments |
| passed, and then invoked as normal commands. |
| In addition to referencing the formal parameters you can reference the |
| <code class="docutils literal"><span class="pre">ARGC</span></code> variable which will be set to the number of arguments passed |
| into the function as well as <code class="docutils literal"><span class="pre">ARGV0</span></code>, <code class="docutils literal"><span class="pre">ARGV1</span></code>, <code class="docutils literal"><span class="pre">ARGV2</span></code>, ... which |
| will have the actual values of the arguments passed in. |
| This facilitates creating functions with optional arguments. |
| Additionally <code class="docutils literal"><span class="pre">ARGV</span></code> holds the list of all arguments given to the |
| function and <code class="docutils literal"><span class="pre">ARGN</span></code> holds the list of arguments past the last expected |
| argument. |
| Referencing to <code class="docutils literal"><span class="pre">ARGV#</span></code> arguments beyond <code class="docutils literal"><span class="pre">ARGC</span></code> have undefined |
| behavior. Checking that <code class="docutils literal"><span class="pre">ARGC</span></code> is greater than <code class="docutils literal"><span class="pre">#</span></code> is the only way |
| to ensure that <code class="docutils literal"><span class="pre">ARGV#</span></code> was passed to the function as an extra |
| argument.</p> |
| <p>A function opens a new scope: see <span class="target" id="index-0-command:set"></span><a class="reference internal" href="set.html#command:set" title="set"><code class="xref cmake cmake-command docutils literal"><span class="pre">set(var</span> <span class="pre">PARENT_SCOPE)</span></code></a> for |
| details.</p> |
| <p>See the <span class="target" id="index-0-command:cmake_policy"></span><a class="reference internal" href="cmake_policy.html#command:cmake_policy" title="cmake_policy"><code class="xref cmake cmake-command docutils literal"><span class="pre">cmake_policy()</span></code></a> command documentation for the behavior |
| of policies inside functions.</p> |
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