Not able to create ALIAS target.

[ssdbest]

jsoncpp 1.8.4 creates target jsoncpp_lib_static where as 1.9.4 creates jsoncpp_static. We use 1.8.4 for some platforms and 1.9.4 for some. This makes us to use if else ladder in our scripts.
Instead we can create ALIAS using cmake add_library(jsoncpp_lib_static ALIAS jsoncpp_static)
this is failing because jsoncpp is not creating global target.
jsoncpp should import targets with global scope.
add_library(jsoncpp_static STATIC EXPORTED GLOBAL)

[cdunn2001]

Yes, a mistake was made when the target name switched.

At any rate, if you submit a PR for cmake, we'd use it. We try not to touch the cmakefiles ourselves because every change seems to make one user happy but break another.

(Btw, meson is simpler. We have practically no support burden with meson and endless troubles with cmake.)

[SpaceIm]

@ssdbest, maybe it could help in your CMakeLists:

find_package(jsoncpp REQUIRED CONFIG)
if(NOT TARGET jsoncpp_lib_static) # version >= 1.9.0
    add_library(jsoncpp_lib_static INTERFACE IMPORTED)
    if(TARGET jsoncpp_static) # version >= 1.9.4
        set_property(TARGET jsoncpp_lib_static PROPERTY INTERFACE_LINK_LIBRARIES jsoncpp_static)
    else() # 1.9.0 <= version < 1.9.4
        set_property(TARGET jsoncpp_lib_static PROPERTY INTERFACE_LINK_LIBRARIES jsoncpp_lib)
    endif()
endif()

[cdunn2001]

Please submit a PR. Or see if the recent merge (#1271) will help with this.