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copied!<pre><code>Can anyone explain me why I can not use variables in Script file? </code></pre> <p><code>install(SCRIPT ...)</code> command works like <a href="http://www.cmake.org/cmake/help/v2.8.12/cmake.html#opt%3a-Pfile">cmake -P</a>. So there is no variables forwarded from parent script to child (until you explicitly define one):</p> <pre><code>> cat run.cmake if(A) message("A: ${A}") else() message("A is empty") endif() > cmake -P run.cmake A is empty > cmake -DA=15 -P run.cmake A: 15 </code></pre> <p>Using <code>CMakeLists.txt</code>:</p> <pre><code>> cat CMakeLists.txt cmake_minimum_required(VERSION 2.8) set(A 43) execute_process(COMMAND ${CMAKE_COMMAND} -P run.cmake) > cmake -H. -B_builds A is empty </code></pre> <p>Forward to child process:</p> <pre><code>> cat CMakeLists.txt cmake_minimum_required(VERSION 2.8) set(A 43) execute_process(COMMAND ${CMAKE_COMMAND} -DA=${A} -P run.cmake) > cmake -H. -B_builds A: 43 </code></pre> <h3>Solution #1 (forwarding)</h3> <p>Using <code>install(CODE ...)</code> command you can define variable for <code>run.cmake</code> script:</p> <pre><code>> cat CMakeLists.txt install( CODE "execute_process( COMMAND ${CMAKE_COMMAND} -DA=${A} -P ${CMAKE_CURRENT_LIST_DIR}/run.cmake )" ) > cmake -H. -B_builds -DA=554 > cmake --build _builds --target install Install the project... -- Install configuration: "" A: 554 </code></pre> <h3>Solution #2 (configuring)</h3> <p>You can configure install script using <a href="http://www.cmake.org/cmake/help/v2.8.12/cmake.html#command%3aconfigure_file">configure_file</a> command:</p> <pre><code>> cat run.cmake.in set(A @A@) if(A) message("A: ${A}") else() message("A is empty") endif() > cat CMakeLists.txt set(custom_script ${PROJECT_BINARY_DIR}/custom_install_scripts/run.cmake) configure_file(run.cmake.in ${custom_script} @ONLY) install(SCRIPT ${custom_script}) > cmake -H. -B_builds -DA=42 > cmake --build _builds --target install Install the project... -- Install configuration: "" A: 42 </code></pre>

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