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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_compile_definitions"></span><a class="reference internal" href="../command/add_compile_definitions.html#command:add_compile_definitions" title="add_compile_definitions"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_compile_definitions()</span></code></a> (or <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 notranslate"><span class="pre">add_definitions()</span></code></a>) command.</p> | |
| <p>The <code class="docutils literal notranslate"><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 notranslate"><span class="pre">VAR</span></code> or <code class="docutils literal notranslate"><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-none notranslate"><div class="highlight"><pre><span></span># - broken almost everywhere | |
| ; - broken in VS IDE 7.0 and Borland Makefiles | |
| , - broken in VS IDE | |
| % - broken in some cases in NMake | |
| & | - broken in some cases on MinGW | |
| ^ < > \" - broken in most Make tools on Windows | |
| </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 notranslate"><span class="pre">COMPILE_DEFINITIONS</span></code> may use "generator expressions" with | |
| the syntax <code class="docutils literal notranslate"><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 notranslate"><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 notranslate"><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 notranslate"><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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