[CMake] Question about transitive deps and static libs.

[Eric Noulard]

I have a question concerning the transitive linking of dependence and
static libs.

I'm working a on prokect where some shared lib are linked to static lib (do
not ask me why).
So I do:

set(CMAKE_POSITION_INDEPENDENT_CODE True)

then I have a bunch of libraries (either static or shared) which depends on
each other.
I use PRIVATE and PUBLIC specification with target_link_librairies.

Now I expected that the transitive link properties would be fullfilled
simply i.e. that
when some target LIB1 is PRIVATEly link against say pthread. Then if a
another
lib LIB2 is linked against LIB1 then then "pthread" wouldn't be dragged
into the link
interface of LIB2.

It seems that this is not as simple as I thought and as soon as LIB1 is
static
then LIB2 gets the dependency (be it PRIVATE or PUBLIC)...

Find attached a small example.

Is this a bug, a feature or something I didn't catch?


-- 
Eric
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