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POEclipse Juno with CDT Doesn't Add Built-in Include Directories
 

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    <p>Since I upgraded from Eclipse Indigo to Juno (on Ubuntu 12.04), I've been having the problem where it shows "unresolved inclusion" errors for standard libraries (e.g. next to <code>#include &lt;iostream&gt;</code> and <code>#include &lt;vector&gt;</code>, etc.), although the program builds and runs fine (using g++). This only occurs in new projects created with Juno, not old ones from Indigo in my workspace.</p> <p>Thanks to several other SO questions (see below*), I was able to trace the source of the problem to the absence of the "built-in values" in a project's Properties > C/C++ General > Paths and Symbols > Includes tab: </p> <pre><code>/usr/include/c++/4.6 /usr/include/c++/4.6/x86_64-linux-gnu /usr/include/c++/4.6/backward /usr/lib/gcc/x86_64-linux-gnu/4.6/include /usr/lib/gcc/x86_64-linux-gnu/4.6/include-fixed /usr/include/x86_64-linux-gnu /usr/include </code></pre> <p>are present when the "Show built-in values" checkbox is ticked in my old Indigo projects that didn't have this problem, but are absent in my new projects created with Juno. Sure enough, if I add these seven directories manually to the Includes tab in a project's settings, the problem disappears. But I don't want to have to do this manually for every new project I create. Is there a reason this is no longer the default in Juno, and is there a way to restore it? </p> <p>*Other SO questions with similar issues I have consulted but did not solve my problem:</p> <ul> <li><a href="https://stackoverflow.com/questions/7962655/eclipse-3-7-0-indigo-with-cdt-shows-many-false-compilation-errors">Eclipse 3.7.0 Indigo with CDT shows many false compilation errors</a>: I thought Erzsébet Geréb's answer would be my solution -- in Juno, if I create a new C++ project with "Project type" as one of the categories under "GNU Autotools" instead of "Executable," the built-in directories are there. (In Indigo, there's no GNU Autotools category. If I created it in Indigo as an empty or Hello World project under "Executable," those directories are there, but they're not if I do it that way in Juno -- I have to pick an option under "GNU Autotools.") But then, with a "GNU Autotools" project, when I go to the project's Properties > C/C++ Build > Settings, the "Tool Settings" tab is no longer present and I am unable to add include paths for the GCC C++ Compiler and libraries for the GCC C++ Linker, which I need to do because many of my C++ projects use OpenCV libraries. </li> <li><a href="https://stackoverflow.com/questions/9337757/unresolved-inclusion-stdio-h">&quot;Unresolved inclusion&quot; error with Eclipse CDT for C standard library headers</a>: Told me how to add the include paths manually, but not how to have the built-in ones added by default</li> <li><a href="https://stackoverflow.com/questions/6980186/error-symbol-vector-could-not-be-resolved">error , Symbol &#39;vector&#39; could not be resolved</a>: Cleaning <code>~/.eclipse/</code> and rebuilding index didn't help.</li> <li><a href="https://stackoverflow.com/questions/9864003/eclipse-cdt-builtin-include-directories">Eclipse CDT Builtin Include Directories</a>: Discovery Options are set the same as my projects that do work properly.</li> <li><a href="https://stackoverflow.com/questions/8291993/eclipse-cdt-8-01-default-paths-libstdc-libstdc-totally-disappeared-in-inc">eclipse CDT 8.01 - default paths (libstdc,libstdc++) totally disappeared in &#39;includes&#39; directory</a></li> <li><a href="https://stackoverflow.com/questions/8144751/eclipse-cdt-indexer-lost-after-system-update">Eclipse CDT indexer lost after system update</a>: Doesn't solve the problem for all new projects.</li> </ul>
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    1. COThis kind of problem happens also with other Eclipse versions, e.g. Kepler, and like you suggest, not just when upgrading the version but in various other scenarios.
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    2. COSuggest you accept @languitar's answer, it works for me...
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