[CMake] ExternalProject_Add: directing cmake to a different <path-to-source>

[Miklos Espak]

Specify a patch command that creates a toplevel cmake list with one
'add_subdirectory(A)'  line.

On Sun, 8 Feb 2015 4:14 am Neil Carlson <neil.n.carlson at gmail.com> wrote:

> I'm trying to get ExternalProject_Add to build a TPL that doesn't have a
> CMakeLists.txt file in the top-level directory.  The TPL untars as
> foo/{A,B} where A and B each contain a CMakeLists.txt file and are
> independent of each other.  I only want to build "A" and would like to have
> cmake run with "foo/A" as the <path-to-source>.  Unfortunately I can't seem
> to manage it. The tar file is unpacked with ${SOURCE_DIR} as its root, and
> that same directory is used as the <path-to-source> for the cmake command
> -- I want ${SOURCE_DIR}/A.  Any suggestions on how to make ExternalProject
> do what I want?  Clearly I can just repackage the tar file, but I'd rather
> use the pristine tar file if I can.
>
> Thanks
> --
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