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| <div class="section" id="imported-objects"> |
| <span id="prop_tgt:IMPORTED_OBJECTS"></span><h1>IMPORTED_OBJECTS<a class="headerlink" href="#imported-objects" title="Permalink to this headline">¶</a></h1> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.9.</span></p> |
| </div> |
| <p>A <a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">semicolon-separated list</span></a> of absolute paths |
| to the object files on disk for an <a class="reference internal" href="../manual/cmake-buildsystem.7.html#imported-targets"><span class="std std-ref">imported</span></a> |
| <a class="reference internal" href="../manual/cmake-buildsystem.7.html#object-libraries"><span class="std std-ref">object library</span></a>.</p> |
| <p>Ignored for non-imported targets.</p> |
| <p>Projects may skip <code class="docutils literal notranslate"><span class="pre">IMPORTED_OBJECTS</span></code> if the configuration-specific |
| property <span class="target" id="index-0-prop_tgt:IMPORTED_OBJECTS_<CONFIG>"></span><a class="reference internal" href="IMPORTED_OBJECTS_CONFIG.html#prop_tgt:IMPORTED_OBJECTS_<CONFIG>" title="IMPORTED_OBJECTS_<CONFIG>"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">IMPORTED_OBJECTS_<CONFIG></span></code></a> is set instead, except in |
| situations as noted in the section below.</p> |
| <div class="section" id="xcode-generator-considerations"> |
| <h2>Xcode Generator Considerations<a class="headerlink" href="#xcode-generator-considerations" title="Permalink to this headline">¶</a></h2> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.20.</span></p> |
| </div> |
| <p>For Apple platforms, a project may be built for more than one architecture. |
| This is controlled by the <span class="target" id="index-0-variable:CMAKE_OSX_ARCHITECTURES"></span><a class="reference internal" href="../variable/CMAKE_OSX_ARCHITECTURES.html#variable:CMAKE_OSX_ARCHITECTURES" title="CMAKE_OSX_ARCHITECTURES"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_OSX_ARCHITECTURES</span></code></a> variable. |
| For all but the <span class="target" id="index-0-generator:Xcode"></span><a class="reference internal" href="../generator/Xcode.html#generator:Xcode" title="Xcode"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Xcode</span></code></a> generator, CMake invokes compilers once |
| per source file and passes multiple <code class="docutils literal notranslate"><span class="pre">-arch</span></code> flags, leading to a single |
| object file which will be a universal binary. Such object files work well |
| when listed in the <code class="docutils literal notranslate"><span class="pre">IMPORTED_OBJECTS</span></code> of a separate CMake build, even for |
| the <span class="target" id="index-1-generator:Xcode"></span><a class="reference internal" href="../generator/Xcode.html#generator:Xcode" title="Xcode"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Xcode</span></code></a> generator. But producing such object files with the |
| <span class="target" id="index-2-generator:Xcode"></span><a class="reference internal" href="../generator/Xcode.html#generator:Xcode" title="Xcode"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Xcode</span></code></a> generator is more difficult, since it invokes the compiler |
| once per architecture for each source file. Unlike the other generators, |
| it does not generate universal object file binaries.</p> |
| <p>A further complication with the <span class="target" id="index-3-generator:Xcode"></span><a class="reference internal" href="../generator/Xcode.html#generator:Xcode" title="Xcode"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Xcode</span></code></a> generator is that when |
| targeting device platforms (iOS, tvOS or watchOS), the <span class="target" id="index-4-generator:Xcode"></span><a class="reference internal" href="../generator/Xcode.html#generator:Xcode" title="Xcode"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Xcode</span></code></a> |
| generator has the ability to use either the device or simulator SDK without |
| needing CMake to be re-run. The SDK can be selected at build time. |
| But since some architectures can be supported by both the device and the |
| simulator SDKs (e.g. <code class="docutils literal notranslate"><span class="pre">arm64</span></code> with Xcode 12 or later), not all combinations |
| can be represented in a single universal binary. The only solution in this |
| case is to have multiple object files.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">IMPORTED_OBJECTS</span></code> doesn't support generator expressions, so every file |
| it lists needs to be valid for every architecture and SDK. If incorporating |
| object files that are not universal binaries, the path and/or file name of |
| each object file has to somehow encapsulate the different architectures and |
| SDKs. With the <span class="target" id="index-5-generator:Xcode"></span><a class="reference internal" href="../generator/Xcode.html#generator:Xcode" title="Xcode"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Xcode</span></code></a> generator, Xcode variables of the form |
| <code class="docutils literal notranslate"><span class="pre">$(...)</span></code> can be used to represent these aspects and Xcode will substitute |
| the appropriate values at build time. CMake doesn't interpret these |
| variables and embeds them unchanged in the Xcode project file. |
| <code class="docutils literal notranslate"><span class="pre">$(CURRENT_ARCH)</span></code> can be used to represent the architecture, while |
| <code class="docutils literal notranslate"><span class="pre">$(EFFECTIVE_PLATFORM_NAME)</span></code> can be used to differentiate between SDKs.</p> |
| <p>The following shows one example of how these two variables can be used to |
| refer to an object file whose location depends on both the SDK and the |
| architecture:</p> |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">add_library(</span><span class="nb">someObjs</span><span class="w"> </span><span class="no">OBJECT</span><span class="w"> </span><span class="no">IMPORTED</span><span class="nf">)</span><span class="w"></span> |
| |
| <span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">someObjs</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="no">IMPORTED_OBJECTS</span><span class="w"></span> |
| <span class="w"> </span><span class="c"># Quotes are required because of the ()</span> |
| <span class="w"> </span><span class="s">"/path/to/somewhere/objects$(EFFECTIVE_PLATFORM_NAME)/$(CURRENT_ARCH)/func.o"</span><span class="w"></span> |
| <span class="nf">)</span><span class="w"></span> |
| |
| <span class="c"># Example paths:</span> |
| <span class="c"># /path/to/somewhere/objects-iphoneos/arm64/func.o</span> |
| <span class="c"># /path/to/somewhere/objects-iphonesimulator/x86_64/func.o</span> |
| </pre></div> |
| </div> |
| <p>In some cases, you may want to have configuration-specific object files |
| as well. The <code class="docutils literal notranslate"><span class="pre">$(CONFIGURATION)</span></code> Xcode variable is often used for this and |
| can be used in conjunction with the others mentioned above:</p> |
| <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">add_library(</span><span class="nb">someObjs</span><span class="w"> </span><span class="no">OBJECT</span><span class="w"> </span><span class="no">IMPORTED</span><span class="nf">)</span><span class="w"></span> |
| <span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">someObjs</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="no">IMPORTED_OBJECTS</span><span class="w"></span> |
| <span class="w"> </span><span class="s">"/path/to/somewhere/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)/$(CURRENT_ARCH)/func.o"</span><span class="w"></span> |
| <span class="nf">)</span><span class="w"></span> |
| |
| <span class="c"># Example paths:</span> |
| <span class="c"># /path/to/somewhere/Release-iphoneos/arm64/func.o</span> |
| <span class="c"># /path/to/somewhere/Debug-iphonesimulator/x86_64/func.o</span> |
| </pre></div> |
| </div> |
| <p>When any Xcode variable is used, CMake is not able to fully evaluate the |
| path(s) at configure time. One consequence of this is that the |
| configuration-specific <span class="target" id="index-1-prop_tgt:IMPORTED_OBJECTS_<CONFIG>"></span><a class="reference internal" href="IMPORTED_OBJECTS_CONFIG.html#prop_tgt:IMPORTED_OBJECTS_<CONFIG>" title="IMPORTED_OBJECTS_<CONFIG>"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">IMPORTED_OBJECTS_<CONFIG></span></code></a> properties cannot |
| be used, since CMake cannot determine whether an object file exists at a |
| particular <code class="docutils literal notranslate"><span class="pre"><CONFIG></span></code> location. The <code class="docutils literal notranslate"><span class="pre">IMPORTED_OBJECTS</span></code> property must be |
| used for these situations and the configuration-specific aspects of the path |
| should be handled by the <code class="docutils literal notranslate"><span class="pre">$(CONFIGURATION)</span></code> Xcode variable.</p> |
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| <li><a class="reference internal" href="#">IMPORTED_OBJECTS</a><ul> |
| <li><a class="reference internal" href="#xcode-generator-considerations">Xcode Generator Considerations</a></li> |
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