CMake has the macros CHECK_C_COMPILER_FLAG and CHECK_CXX_COMPILER_FLAG, which
allow checking for whether a given C or C++ compiler flag is supported by the
compiler being used.
However, there's no CHECK_LINKER_FLAG macro, so that you can check whether a
given *linker* flag is supported by the linker being used, so there doesn't
seem to be a good way to use a flag, such as the --as-needed flag, if it's not
*required*, but is "nice to have", but isn't available on all platforms.
So what's the best way to do such a check?
(I'm assuming here that, for all generators on UN*X platforms, linking is done
by using the compiler driver, so that you don't have to worry about, for
example, using -Wl,{linker flag} with some generators and just {linker flag}
with other generators.)
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