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

[Tom Kacvinsky]

On Fri, Sep 18, 2015 at 3:08 PM, Tom Kacvinsky <tom.kacvinsky at vectorcast.com
> wrote:

> 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
>
>
I figured it out.  That generator expression is only valid inside an
add_library or add_executable target.
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