g++ gprof global constructors keyed to static member

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I'm profiling a c++ app on linux compiled with g++.

In the gprof output I'm getting some nontrivial usage statistics for:

global constructors keyed to _ZN4CGps14ms_OutputNamesE

Where _ZN4CGps14ms_OutputNamesE is the mangled name of a static member of one of my classes. It's an array of std::strings:

static std::string ms_OutputNames[MAXOUTPUTS];

I'm a bit surprised that this isn't being constructed once at the beginning of the app. Is there some sort of guard variable or first usage check going on? How would I go about optimising this?

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