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The workaround is obsolete, from Boost.Config it looks like it was used for very old EDG2.4, VC6, and other compilers in VC6 emulation mode.
I have checked MSVC 9.0, GCC 4.1.2, Clang 3.0.0, and ICC 13.0.1 - all of them do allow void return. https://godbolt.org/z/9zS4TS