COMP: Fix standalone build updating JsonCpp integration

For sake of consistency with how Slicer integrates JsonCpp, we ignore
the "jsoncppConfig.cmake" file provided by jsoncpp CMake project and
instead set JsonCpp_INCLUDE_DIR and JsonCpp_LIBRARY expected by the
"FindJsonCpp" CMake module.

To streamline distribution of the standalone Autoscoper executable, update
JsonCpp project to statically build the JsonCpp library.

CMake/FindJsonCpp.cmake

@@ -0,0 +1,40 @@
+# Find the JsonCpp include files and library.
+#
+# JsonCpp is a C++ library that can read/write JSON (JavaScript Object Notation)
+# documents. See http://jsoncpp.sourceforge.net/ for more details.
+#
+# This module defines:
+# JsonCpp_INCLUDE_DIRS - where to find json/json.h
+# JsonCpp_LIBRARIES - the libraries to link against to use JsonCpp
+# JsonCpp_FOUND - if false the library was not found.
+
+find_path(JsonCpp_INCLUDE_DIR "json/json.h"
+  PATH_SUFFIXES "jsoncpp"
+  DOC "Specify the JsonCpp include directory here")
+
+find_library(JsonCpp_LIBRARY
+  NAMES jsoncpp
+  PATHS
+  DOC "Specify the JsonCpp library here")
+set(JsonCpp_INCLUDE_DIRS ${JsonCpp_INCLUDE_DIR})
+set(JsonCpp_LIBRARIES "${JsonCpp_LIBRARY}")
+
+set(_JsonCpp_version_args)
+if (EXISTS "${JsonCpp_INCLUDE_DIR}/json/version.h")
+  file(STRINGS "${JsonCpp_INCLUDE_DIR}/json/version.h" _JsonCpp_version_contents REGEX "JSONCPP_VERSION_[A-Z]+")
+  foreach (_JsonCpp_version_part MAJOR MINOR PATCH)
+    string(REGEX REPLACE ".*# *define +JSONCPP_VERSION_${_JsonCpp_version_part} +([0-9]+).*"
+      "\\1" JsonCpp_VERSION_${_JsonCpp_version_part} "${_JsonCpp_version_contents}")
+  endforeach ()
+
+  set(JsonCpp_VERSION_STRING "${JsonCpp_VERSION_MAJOR}.${JsonCpp_VERSION_MINOR}.${JsonCpp_VERSION_PATCH}")
+
+  set(_JsonCpp_version_args VERSION_VAR JsonCpp_VERSION_STRING)
+endif ()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(JsonCpp
+  REQUIRED_VARS JsonCpp_LIBRARIES JsonCpp_INCLUDE_DIRS
+  ${_JsonCpp_version_args})
+
+mark_as_advanced(JsonCpp_INCLUDE_DIR JsonCpp_LIBRARY)

Superbuild/External_JsonCpp.cmake

@@ -47,8 +47,8 @@ if((NOT DEFINED JsonCpp_INCLUDE_DIR
       -DJSONCPP_WITH_WARNING_AS_ERROR:BOOL=OFF
       -DJSONCPP_WITH_PKGCONFIG_SUPPORT:BOOL=OFF
       -DJSONCPP_WITH_CMAKE_PACKAGE:BOOL=ON
-      -DBUILD_SHARED_LIBS:BOOL=ON
-      -DBUILD_STATIC_LIBS:BOOL=OFF
+      -DBUILD_SHARED_LIBS:BOOL=OFF
+      -DBUILD_STATIC_LIBS:BOOL=ON
       # Install directories
       -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
       -DCMAKE_INSTALL_BINDIR:STRING=${Autoscoper_BIN_DIR}
@@ -57,10 +57,19 @@ if((NOT DEFINED JsonCpp_INCLUDE_DIR
     DEPENDS
       ${${proj}_DEPENDENCIES}
     )
-  set(JSONCPP_DIR ${EP_INSTALL_DIR})
-  set(JSONCPP_SOURCE_DIR ${EP_SOURCE_DIR})
-  set(JSONCPP_INCLUDE_DIR ${JSONCPP_DIR}/include)
-  set(JSONCPP_LIBRARY ${JSONCPP_DIR}/lib/${CMAKE_SHARED_LIBRARY_PREFIX}jsoncpp${CMAKE_SHARED_LIBRARY_SUFFIX})
-
-  mark_as_superbuild(JSONCPP_DIR JSONCPP_SOURCE_DIR JSONCPP_INCLUDE_DIR JSONCPP_LIBRARY)
+  set(${proj}_INCLUDE_DIR ${EP_INSTALL_DIR}/include)
+  set(${proj}_LIBRARY ${EP_INSTALL_DIR}/${Autoscoper_LIB_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}jsoncpp${CMAKE_STATIC_LIBRARY_SUFFIX})
+else()
+  ExternalProject_Add_Empty(${proj} DEPENDS ${${proj}_DEPENDENCIES})
 endif()
+
+# For sake of consistency with how Slicer integrates JsonCpp, we ignore the "jsoncppConfig.cmake" file provided by jsoncpp and
+# instead set JsonCpp_INCLUDE_DIR and JsonCpp_LIBRARY expected by the "FindJsonCpp" CMake module.
+mark_as_superbuild(
+  VARS
+    ${proj}_INCLUDE_DIR:PATH
+    ${proj}_LIBRARY:FILEPATH
+)
+
+ExternalProject_Message(${proj} "${proj}_INCLUDE_DIR:${${proj}_INCLUDE_DIR}")
+ExternalProject_Message(${proj} "${proj}_LIBRARY:${${proj}_LIBRARY}")

libautoscoper/CMakeLists.txt

@@ -106,7 +106,8 @@ target_link_libraries(libautoscoper PUBLIC TIFF::TIFF)
 target_compile_definitions(libautoscoper PUBLIC -DUSE_LIBTIFF)
 
 find_package(JsonCpp REQUIRED)
-target_link_libraries(libautoscoper PUBLIC JsonCpp::JsonCpp)
+target_link_libraries(libautoscoper PRIVATE ${JsonCpp_LIBRARY})
+target_include_directories(libautoscoper PRIVATE ${JsonCpp_INCLUDE_DIR})
 
 target_include_directories(libautoscoper PUBLIC
   ${CMAKE_CURRENT_BINARY_DIR}