On 05-May-15 20:01, Stephen Kelly wrote:
CHEVRIER, Marc wrote:
Hi,
Currently it is not possible to create an alias target for an imported
target (I.e. add_library with ALIAS keyword). But I don’t understand what
is the technical constraint or semantic reason behind this limitation. If
anybody can explain this limitation, it will be nice.
It was designed with as many restrictions as I could think of (everything
which was not part of the need to add it at all):
http://www.cmake.org/gitweb?p=cmake.git;a=commitdiff;h=370bf554
The restrictions are there because they are easy to lift later when a need
arises without breaking user code. It also means that design considerations
which were not known or understood two years ago can be considered in
designing new interfaces.
Do you have a need for ALIAS IMPORTED libraries? Can you describe it?
Thanks,
Steve.
It may be helpful in situations when you build package with examples. In
case when you want examples to work both as a part of a project
(add_subdirectory) or stand-alone (find_package).
For instance:
if(TARGET bar)
# bar and boo targets in the same project
add_library(Foo::bar ALIAS bar)
else()
# boo installed first, bar build as a stand-alone project
find_package(Foo CONFIG REQUIRED) # target Foo::bar
endif()
target_link_libraries(boo Foo::bar)
If ALIAS will be allowed for imported targets we can write:
if(NOT TARGET bar)
find_package(Foo CONFIG REQUIRED)
add_libarary(bar ALIAS Foo::bar)
endif()
target_link_libraries(boo bar)
We are not saving any space here and it's not critical feature, but this
symmetry looks reasonable.
Ruslo
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