[CMake] OBJECT library and $<TARGET_OBJECTS:...>

[Tom Kacvinsky]

Snippet:

add_libary(foo OBJECT a.c b.c)

add_custom_command(
  OUTPUT exports.def
  COMMAND lib /out:static.lib $<TARGET_OBJECTS:foo>
  COMMAND python export.py" static.lib exports.def
  DEPENDS export.py"
)

Results in:

CMake Error at CMakeLists.txt:289 (add_custom_command):
  Error evaluating generator expression:

    $<TARGET_OBJECTS:foo>

  Expression did not evaluate to a known generator expression

What am I doing wrong?  I am using cmake 2.8.11.2 on windows and my
understanding is that the TARGET_OBJECTS generator expression was
introduced in 2.8.8

Thanks,

Tom
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