won't generate *.dylib on macOS with Xcode

[dingzeyuli]

I tried to compile nanogui library on my mac. I use cmake to generate an Xcode project. The libglfw_objects and nanogui-obj can be generated. But the final nanogui does not show up.

After some digging, I think this might be the reason.

Some native build systems may not like targets that have only object files, so consider adding at least one real source file to any target that references $<TARGET_OBJECTS:objlib>.

Sources: [1] [2]

My workaround is to add a blank.c file in the nanogui src and modify the CMakeLists.txt:

add_library(nanogui
${NANOGUI_LIBRARY_TYPE}
blank.c
$<TARGET_OBJECTS:nanogui-obj>
$<TARGET_OBJECTS:glfw_objects>
)

The blank.c file is empty, just there to activate the Xcode building system. With this modification, nanogui now compiles with Xcode.

[svenevs]

Thanks for the detailed report @dingzeyuli, is this the same as #220? That one kind of disappeared into the fold, but I believe it achieves the same fix.

[dingzeyuli]

Yeah, thanks @svenevs. That pull request has not yet been accepted. So the current nanogui code still fails with Xcode+cmake. That one seems to pass the integration test. Is there any plan to accept it? Thank you.

[wjakob]

That PR failed the CI tests, so I never seriously looked at it. I'll write some comments on #220.

[liminchen]

Hi Liding, Is the problem you encountered the one below?
I tried your fix but it still doesn't work...

[svenevs]

Fixed in #304.