No small string optimization with gcc?

Question

Most std::string implementations (GCC included) use small string optimization. E.g. there\'s an answer discussing this.

Today, I decided to check at what po

Answer 1

One of your flags is:

--with-default-libstdcxx-abi=gcc4-compatible

and GCC4 does not support small string optimzation.

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GCC5 started supporting it. isocpp states:

A new implementation of std::string is enabled by default, using the small string optimization instead of copy-on-write reference counting.

which supports my claim.

Moreover, Exploring std::string mentions:

As we see, older libstdc++ implements copy-on-write, and so it makes sense for them to not utilize small objects optimization.

and then he changes context, when GCC5 comes in play.