[CMake] compilation order dependencies,

[Petr Kmoch]

Hi Lukasz.

I believe you could put `main.cpp` into an object library:

add_library(foo ${foosources})
add_library(bar ${barsources})
add_library...
...
...
add_library(main_sources OBJECT main.cpp)
add_executable(foo_exe $<TARGET_OBJECTS:main_sources>)
target_link_libraries(foo_exe foo bar ... ... ...)

This should make `main.cpp` compilable independently, as only the linking
of foo_exe will wait until the libraries (including the object one) are
finished.

Petr


On Wed, Aug 27, 2014 at 10:30 AM, Łukasz Tasz <lukasz at tasz.eu> wrote:

> Dear experts,
>
> I hit the wall again with order of compilation in generated Makefiles,
>
> Uscase:
>
> add_library(foo ${foosources})
> add_library(bar ${barsources})
> add_library...
> ...
> ...
> add_executable(foo_exe main.cpp)
> target_link_libraries(foo_exe foo bar ... ... ...)
>
> while libs objects will be compiled in parallel, man.cpp.o will be
> compiled after linking of all libs,
> If main.cpp is compiling long then this is overall additional waist of
> time which could be done much earlier.
>
> Do you have some ideas how this situation could be optimised?
>
> with best regards
> Łukasz Tasz
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