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| <div class="section" id="compile-definitions"> |
| <span id="prop_dir:COMPILE_DEFINITIONS"></span><h1>COMPILE_DEFINITIONS<a class="headerlink" href="#compile-definitions" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Preprocessor definitions for compiling a directory’s sources.</p> |
| <p>This property specifies the list of options given so far to the |
| <span class="target" id="index-0-command:add_definitions"></span><a class="reference internal" href="../command/add_definitions.html#command:add_definitions" title="add_definitions"><code class="xref cmake cmake-command docutils literal"><span class="pre">add_definitions()</span></code></a> command.</p> |
| <p>The <code class="docutils literal"><span class="pre">COMPILE_DEFINITIONS</span></code> property may be set to a semicolon-separated |
| list of preprocessor definitions using the syntax <code class="docutils literal"><span class="pre">VAR</span></code> or <code class="docutils literal"><span class="pre">VAR=value</span></code>. |
| Function-style definitions are not supported. CMake will |
| automatically escape the value correctly for the native build system |
| (note that CMake language syntax may require escapes to specify some |
| values).</p> |
| <p>This property will be initialized in each directory by its value in the |
| directory’s parent.</p> |
| <p>CMake will automatically drop some definitions that are not supported |
| by the native build tool.</p> |
| <p>Disclaimer: Most native build tools have poor support for escaping |
| certain values. CMake has work-arounds for many cases but some values |
| may just not be possible to pass correctly. If a value does not seem |
| to be escaped correctly, do not attempt to work-around the problem by |
| adding escape sequences to the value. Your work-around may break in a |
| future version of CMake that has improved escape support. Instead |
| consider defining the macro in a (configured) header file. Then |
| report the limitation. Known limitations include:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># - broken almost everywhere</span> |
| <span class="p">;</span> <span class="o">-</span> <span class="n">broken</span> <span class="ow">in</span> <span class="n">VS</span> <span class="n">IDE</span> <span class="mf">7.0</span> <span class="ow">and</span> <span class="n">Borland</span> <span class="n">Makefiles</span> |
| <span class="p">,</span> <span class="o">-</span> <span class="n">broken</span> <span class="ow">in</span> <span class="n">VS</span> <span class="n">IDE</span> |
| <span class="o">%</span> <span class="o">-</span> <span class="n">broken</span> <span class="ow">in</span> <span class="n">some</span> <span class="n">cases</span> <span class="ow">in</span> <span class="n">NMake</span> |
| <span class="o">&</span> <span class="o">|</span> <span class="o">-</span> <span class="n">broken</span> <span class="ow">in</span> <span class="n">some</span> <span class="n">cases</span> <span class="n">on</span> <span class="n">MinGW</span> |
| <span class="o">^</span> <span class="o"><</span> <span class="o">></span> \<span class="s2">" - broken in most Make tools on Windows</span> |
| </pre></div> |
| </div> |
| <p>CMake does not reject these values outright because they do work in |
| some cases. Use with caution.</p> |
| <p>Contents of <code class="docutils literal"><span class="pre">COMPILE_DEFINITIONS</span></code> may use “generator expressions” with |
| the syntax <code class="docutils literal"><span class="pre">$<...></span></code>. See the <span class="target" id="index-0-manual:cmake-generator-expressions(7)"></span><a class="reference internal" href="../manual/cmake-generator-expressions.7.html#manual:cmake-generator-expressions(7)" title="cmake-generator-expressions(7)"><code class="xref cmake cmake-manual docutils literal"><span class="pre">cmake-generator-expressions(7)</span></code></a> |
| manual for available expressions. See the <span class="target" id="index-0-manual:cmake-buildsystem(7)"></span><a class="reference internal" href="../manual/cmake-buildsystem.7.html#manual:cmake-buildsystem(7)" title="cmake-buildsystem(7)"><code class="xref cmake cmake-manual docutils literal"><span class="pre">cmake-buildsystem(7)</span></code></a> |
| manual for more on defining buildsystem properties.</p> |
| <p>The corresponding <span class="target" id="index-0-prop_dir:COMPILE_DEFINITIONS_<CONFIG>"></span><a class="reference internal" href="COMPILE_DEFINITIONS_CONFIG.html#prop_dir:COMPILE_DEFINITIONS_<CONFIG>" title="COMPILE_DEFINITIONS_<CONFIG>"><code class="xref cmake cmake-prop_dir docutils literal"><span class="pre">COMPILE_DEFINITIONS_<CONFIG></span></code></a> property may |
| be set to specify per-configuration definitions. Generator expressions |
| should be preferred instead of setting the alternative property.</p> |
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