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POUpper level seeing a lower level option
 

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    <p>I have a lower level project that builds several libraries. The upper level takes the libs and links them into many executables. The lower level has this option:</p> <pre><code>option(TOOLA_SUPPORT "Ena/Disable toolA support" OFF) </code></pre> <p>I'd like to get the upper level build to see the <code>TOOLA_SUPPORT</code> flag from the lower level build. As it is now, there are 2 <code>TOOLA_SUPPORT</code> flags. One at the lower, the other at the upper level builds. This is a hassle as they both need to be in the same state for a successful build.</p> <p>I'm not sure how to get one CMakeLists.txt file to inherit a flag from another (cache). (Only want this one flag, not the whole lower CMakeLists.txt/cache settings.) What commands might help, or where to look for info? </p> <p><strong>Edit_1</strong>:<br> <code>dirUpper/src/CMakeLists.txt</code> (Does NOT contain dirLower) I'd like this cmakelists to "inherit" the cache var TOOLA_SUPPORT from <strong>dirLower</strong>/src/CMakeLists.txt</p> <pre><code>option(TOOLA_SUPPORT "" OFF) add_subdirectory(${dirLower}/src ${dirLower}/lib EXCLUDE_FROM_ALL) if(TOOLA_SUPPORT) link_directories(blah bla bla) else() link_directories(blah bla) endif() </code></pre> <p><code>dirLower/src/CMakeLists.txt</code> (Is not part of the dirUpper tree) I'd like to pass TOOLA_SUPPORT from this cmakelists, to <strong>dirUpper</strong>/src/cmakelists.txt </p> <pre><code>IF(NOT (${COMPILER_FLAGS} MATCHES "-Wall")) #this only applies to dirLower MESSAGE(FATAL_ERROR "compiler flag not properly set") #will crash the dirUpper 'config' ENDIF() OPTION(TOOLA_SUPPORT "" OFF) IF(TOOLA_SUPPORT) INCLUDE_DIRECTORIES(some/dir/include) SET(TOOLA_SUPPORT ON CACHE "" FORCE PARENT_SCOPE) ELSE() MESSAGE("TOOLA is not supported") SET(TOOLA_SUPPORT OFF CACHE "" FORCE PARENT_SCOPE) ENDIF() </code></pre> <p>When I run the dirLower file, I get a cmake warning telling me there is no parent for it. (Not part of the dirUpper tree)<br> When I run the dirUpper file, I get a fatal error due to the COMPILER_FLAG test in the dirLower file. When I bypass this issue, Im not seeing the TOOLA_SUPPORT setting being inherited from the dirLower.</p>
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