Hi,

I am getting a race condition when I do a parallel build.

Having an OBJECT library in one directory:
ADD_LIBRARY(symdiff_objects OBJECT ${CXX_SRCS} ${MC_SRCS})
set_property(TARGET symdiff_objects PROPERTY POSITION_INDEPENDENT_CODE ON)

And then having that object library being used in another directory:
TARGET_LINK_LIBRARIES (symdiff_tcl $<TARGET_OBJECTS:symdiff_objects> ${TCL_ARCHIVE})

Results in this error with a parallel build:
15%] Building CXX object src/engine/CMakeFiles/symdiff_static.dir/EquationObject.o make[2]: *** No rule to make target `src/engine/CMakeFiles/symdiff_objects.dir/EquationObject.o', needed by `src/tclcomp/libsymdifftcl.dylib'. Stop.
make[2]: *** Waiting for unfinished jobs....

Serial builds work fine. How do I tell cmake to wait? This is cmake 3.9.0-rc4 running on os x with the makefile generator.

Regards,

Juan
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