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 #include <iostream> and #include <vector>, 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.
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:
/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
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?
*Other SO questions with similar issues I have consulted but did not solve my problem:
- Eclipse 3.7.0 Indigo with CDT shows many false compilation errors: 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.
- "Unresolved inclusion" error with Eclipse CDT for C standard library headers: Told me how to add the include paths manually, but not how to have the built-in ones added by default
- error , Symbol 'vector' could not be resolved: Cleaning
~/.eclipse/and rebuilding index didn't help. - Eclipse CDT Builtin Include Directories: Discovery Options are set the same as my projects that do work properly.
- eclipse CDT 8.01 - default paths (libstdc,libstdc++) totally disappeared in 'includes' directory
- Eclipse CDT indexer lost after system update: Doesn't solve the problem for all new projects.
