I have a question about the expected behavior of Find scripts when a found
library or program has transitive linking dependencies on other shared
libraries that are not available on the system library path, but visible to
Find scripts because of the CMake search paths. I'm using GCC 4.2 on
Linux-i686 and Linux-x86_64, not sure which other systems have similar linking
behavior.
For example, if I call FIND_PACKAGE ("DevIL"), it will pick up my custom IL,
ILU, and ILUT libraries, but when my software tries to link against it, GCC
bombs out because it can't find IL link dependencies such as lcms or mng that
are not installed on my system but are provided by my project, and it will use
the system libpng / libz rather than my custom ones (not really a problem, but
not expected either.) Looking at FindDevIL.cmake, it does not attempt to
search for these dependencies. On the other hand, if I call FIND_PACKAGE
("PNG") it will correctly pick up my custom libz as a dependency and include it
in PNG_LIBRARIES.
Which of these two behaviors should be the "expected" one? I'm in the process
of writing a fair number of Find scripts so I want to do it the "right" way
(and be able to build my project of course.)
Incidentally, I'm writing Find scripts for the following libraries: CppUnit,
LCMS, OGDI (an optional GDAL dependency with support for oddball military
formats), ACE, TAO, MNG, PROJ4, Presagis OpenFlight, and a FindUUID script
which attempts to determine the "native" support for UUID manipulation (e.g.
Rpcrt4.lib on Windows, e2fslibs libuuid on Linux) and reports which style of
UUIDs it found as well as necessary link and include options. I would be happy
to submit any of them if there's interest, but they're only really tested for
my particular project on Linux and Windows.
Thanks,
Gregory Peele, Jr.
Applied Research Associates, Inc.
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