> I was under the impression that C++ optimizations were expensive (say, under -O3 or -Os), so I wish that the same test were run under -O3 or -Os (comparing both the speed of compilation AND the optimizations)
What optimizations are available to the C subset of C++ that are not also available to C? The only thing I can think of offhand which would make compilation of C-with-C++ slower is the difference in symbol naming.
From what I understand of GCC, once the compilation has progressed to the optimization stage the code has already been converted to an intermediate language so the source frontend (gcc or g++) should not necessarily make available extra optimization passes. Again, this is speaking strictly of the subset of C which is common to both C and C++.
