[CMake] static libraries and symbol resolution

[Steven Wilson]

I have a group of static archive libraries (.a libs) on Linux and because of
the way the linker does symbol resolution I need to use the
-Wl,--start-group and -Wl,--end-group linker options to group these
libraries.   These linker options tell the linker to continue searching the
libraries for symbols until all symbol resolution is accomplished.   On the
command line these options need to appear like the following(or some
equivalent variant thereof): -Wl,--start-group libA.a libB.a libC.a ...
-Wl,--end-group.   I can put something together with CMake that can
construct a custom command line to do this kind of thing, but I wanted to
check and see if someone knew a good way to make this happen with CMake
before I started.

Thanks,

Steve
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