Eclipse Mars: Symbol 'unique_ptr' could not be resolved

Question

Using Eclipse Mars, I am getting the Symbol 'unique_ptr' could not be resolved error. I tried adding -std=c++11 to CDT GCC Built-in Compiler Settings, but this didn't help. The error goes away when I reopen Eclipse, but if I make a modification to the code, the error comes back.

One simple code sample:

std::unique_ptr<String> p1;

Answer 1

1. In Eclipse Mars open Window > Preferences > C/C++ > Build > Settings > Discovery > CDT GCC Build-in Compiler Settings
2. Append -std=c++11 to the Command to get compiler specs
3. Press OK
4. Rebuild the index: Project > C/C++ Index > Rebuild