Russell: GCC and C vs C++ Speed, Measured

Rusty Russell ran an investigation to determine whether code compiled with the GCC C++ compiler is slower than code from the C compiler. "With this in mind, and Ian Taylor’s bold assertion that 'The C subset of C++ is as efficient as C', I wanted to test what had changed with some actual measurements. So I grabbed gcc 4.7.2 (the last release which could do this), and built it with C and C++ compilers." His conclusion is that the speed of the compiler is the same regardless of how it was built; using C++ does not slow things down.

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