Hello,
sorry for flooding with e-mails today, it all kinda piled up. This one is about
imported target location for frameworks on OSX (and thus also iOS). I saw the
bugreport here https://cmake.org/Bug/view.php?id=14105 and that it was closed
as "no change needed". The suggested solution was that the Find module needs to
practically work around this with a code similar to the following (for example
finding the SDL2 framework installed through Homebrew on OSX):
find_library(SDL2_LIBRARY SDL2)
if(APPLE AND ${SDL2_LIBRARY} MATCHES "\\.framework$")
set_property(TARGET SDL2::SDL2 PROPERTY IMPORTED_LOCATION
${SDL2_LIBRARY}/SDL2)
else()
set_property(TARGET SDL2::SDL2 PROPERTY IMPORTED_LOCATION
${SDL2_LIBRARY})
endif()
It's ugly to do and I have to do it for all my custom modules that were
switched to imported targets, but seeing that even the builtin `FindQt4.cmake`
is doing the same, I thought that there is no way to use the nice old "just
works" behavior that worked before imported targets.
However, this requires that there actually *is* a file at
`name.framework/name`, which is not always the case. One of those cases is the
`OpenGLES` framework on iOS and for it I *have* to use the `-framework
OpenGLES` way to make it work. In that case the workaround is like this:
find_library(OpenGLES3 OpenGLES) # other platform-specific names omitted
if(APPLE AND ${OPENGLES3_LIBRARY} MATCHES "\\.framework$")
add_library(OpenGLES3::OpenGLES3 INTERFACE IMPORTED)
set_property(TARGET OpenGLES3::OpenGLES3 APPEND PROPERTY
INTERFACE_LINK_LIBRARIES ${OPENGLES3_LIBRARY})
else()
add_library(OpenGLES3::OpenGLES3 UNKNOWN IMPORTED)
set_property(TARGET OpenGLES3::OpenGLES3 PROPERTY IMPORTED_LOCATION
${OPENGLES3_LIBRARY})
endif()
You see that I actually have to completely sidestep the imported target
functionality. Only this way the ${OPENGLES3_LIBRARY} location (which in this
case is
`/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/OpenGLES.framework`)
gets properly replaced with `-framework OpenGLES` on linker command line and
everything works as it should.
My question is: why CMake does not keep the old behavior also for imported
targets? Is there any way to make it "just work" like it was with the old
variable-based approach for finding libraries? I.e. not requiring the users to
do elaborate platform-specific branching and introspection of each framework?
Thanks for your input.
mosra
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