[CMake] integrating cmake projects and those built with legacy build systems

[Bill O'Hara]

As I ponder moving our entire hairy system to cmake, I'm stuck with several
sub-projects where I will not want to replace the existing build system. In
particular we use internal builds of several FSF tools and when necessary to
build one as part of building a cmake'd project we'll just want to delegate
that work to the existing autotools setup to get things built and then
continue in cmake.

I'm assuming this has been hit before by people. Are there any useful
semi-standard modules for handling delegating to autotools build for some
projects, passing in various options and rebuilding as required if something
changes? (Eg. if something changes in a cmake'd project that requires
rebuilding our tweaked gnu tool that depends on our change in some way). Any
advice from those that have gone down this path before?

thanks
b.
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