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Did you click on the small black triangle next to C/C++ General? If you clicked on just C/C++ General it should just say "Enable Project Specific Settings" which is not the option you want.
On Eclipse Luna, which is what I'm using, under C/C++ General it says: >Code analysis, Documentation, File Types, Formatter, Indexer, Language Mapping, Preprocessor Include Paths and Profiling Catagories.
If any of those are missing, you might want to consider using a more recent version of eclipse.
If adding CDT GCC Built-in Compiler Settings [ Shared ] doesn't fix your problem, make sure to check Project -> Properties -> C/C++ Include Paths and Symbols, and see if /usr/include/c++/4.x and /usr/include/c++/4.x/backward are in there. 4.x for me was 4.8. Check yours by using your file manager and going to /usr/include.
Remember to go to Project ->C/C++ Index after finishing.
It should be fixed by then, assuming you installed eclipse and ran it from terminal with bash -i -c "eclipse
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