CMake packaging doesn't support example usage

[HunterZ]

The project readme says to use #include <ixwebsocket/xyz.h> but the CMake install logic uses .../include/ixwebsocket in the exported target properties:

IXWebSocket/CMakeLists.txt

Line 275 in c5a02f1

$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/ixwebsocket>

This means that unless you get the parent include directory via some other means, the #include directive breaks, which is exactly what just happened to me when I tried to reuse some of my ixwebsocket-dependent code in another CMake project.

Note that ixwebsocket's pkgconfig setup exports the parent include directory, so fixing this would bring those into alignment:

IXWebSocket/ixwebsocket.pc.in

Line 4 in c5a02f1

includedir=${prefix}/include

[bsergean]

Do you have any clue on how to fix that, without breaking vcpkg and all ?

[HunterZ]

Well my point is that vcpkg is already broken...It seems the answer is to change:
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/ixwebsocket>
...to:
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
...which would align it with both the pkgconfig setup and other vcpkg packages' CMake configs.