[cmake-developers] Bug: CMakePackageConfigHelpers can't cope with empty install prefix

[rleigh at codelibre.net]

I often configure projects with an empty install prefix and install with
DESTDIR set.  This works for most projects and they are relocatable. 
However, the configure_package_config_file function breaks if this is
done:

CMake Error at cmake/CMakePackageConfigHelpers.cmake:254 (file):
  file RELATIVE_PATH must be passed a full path to the file:
Call Stack (most recent call first):
  CMakeLists.txt:157 (configure_package_config_file)

It can't cope with this case.  It would be nice if it was able to cope
with this situation since the work it's doing is intended to make the
configuration relocatable.


Regards,
Roger Leigh