Eclipse CDT understands the C++ code in a window by running it through an indexer. This indexer is nothing but an invocation of the GCC C++ compiler with certain compilation options. Sometimes, you might want to change the compiler options used by this indexer.
For example, I recently found that C++11 containers and classes (like
future) were not resolved by the indexer and were underlined with red squiggles. This is because the compiler options used by the indexer does not have
To change the compiler options of the indexer:
Open Preferences and go to C/C++ -> Build -> Settings.
Click the Discovery tab and choose CDT GCC Built-in Compiler Settings.
Modify the command string shown below it as you wish. For example, here I added
Eclipse CDT will automatically re-index your C++ files after this is saved. However, I found that this did not remove the unresolved items.
I manually re-indexed by right-clicking the project and choosing Index -> Rebuild. This worked!
Tried with: Eclipse 4.5 (Mars) and Ubuntu 14.04