Optimise away path copy. #384

Job	Run time
linux (g++-9, Debug)	5m 18s
linux (g++-9, Release)	4m 45s
linux (g++-10, Debug)	4m 23s
linux (g++-10, Release)	5m 8s
linux (g++-11, Debug)	8m 2s
linux-old (clang++-7, Debug)	6m 30s
linux (g++-11, Release)	7m 29s
linux-old (clang++-7, Release)	5m 23s
linux (g++-12, Debug)	7m 8s
linux-old (clang++-8, Debug)	4m 45s
linux (g++-12, Release)	8m 45s
linux-old (clang++-8, Release)	8m 24s
linux (clang++-12, Debug)	6s
linux (clang++-12, Release)	5s
linux-old (clang++-9, Debug)	3m 48s
linux (clang++-13, Debug)	4m 3s
linux-old (clang++-9, Release)	5m 37s
linux (clang++-13, Release)	6m 53s
linux-old (clang++-10, Debug)	4m 53s
linux (clang++-14, Debug)	4m 49s
linux-old (clang++-10, Release)	5m 54s
linux (clang++-14, Release)	10m 30s
linux-old (clang++-11, Debug)	5m 25s
linux-old (clang++-11, Release)	8m 14s
linux-clang-extra (-fno-rtti, Debug)	4m 51s
linux-clang-extra (-fno-rtti, Release)	5m 44s
linux-gcc-extra (-fno-rtti, Debug)	6m 24s
linux-clang-extra (-fno-exceptions, Debug)	9s
linux-gcc-extra (-fno-rtti, Release)	5m 2s
linux-clang-extra (-fno-exceptions, Release)	5s
linux-gcc-extra (-fno-exceptions, Debug)	8s
linux-gcc-extra (-fno-exceptions, Release)	5s
linux-clang-extra (-fms-extensions, Debug)	4m 1s
linux-clang-extra (-fms-extensions, Release)	8m 11s
	2h 50m 57s

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