[CMake] Passing generator expressions in variables

[Auer, Jens]

Hi,

I am trying to dynamically assemble a list of generator expressions and use them in add_executable. The background is that I have some macros to add targets, e.g.
add_my_library(TARGET liba SOURCES ...) # this class add_library(liba OBJECT ...) internally
add_my_executable(TARGET a DEPENDS liba libb SOURCES ...)

In add_my_executable, I create a list of $<TARGET_OBEJCTS:${d}> strings for all d {liba, libb}. However, cmake complains that it cannot find the source file $<TARGET_OBJECTS:liba>.

A simplified example of what I want to do is this:
add_library(A OBJECT a.cpp)
set(alib $<TARGET_OBJECTS:A)
add_executable(a.exe ${alib})
add_executable(b.exe $<TARGET_OBJECTS:A> )

With cmake 3.2.2, the first add_executable fails, the second one works. Is there another way to do this?

Best wishes,
  Jens

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