Fix cmake export to allow cross-compilation with sysroot

[aurelien-enchanted-tools]

• v1.7.15 and following

Hello,

Please fix the following:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7aecd98..4a42d92 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -146,21 +146,21 @@ endif()
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/library_config/libcjson.pc.in"
     "${CMAKE_CURRENT_BINARY_DIR}/libcjson.pc" @ONLY)

-install(FILES cJSON.h DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}/cjson")
-install (FILES "${CMAKE_CURRENT_BINARY_DIR}/libcjson.pc" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/pkgconfig")
+install(FILES cJSON.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/cjson")
+install (FILES "${CMAKE_CURRENT_BINARY_DIR}/libcjson.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
 install(TARGETS "${CJSON_LIB}"
     EXPORT "${CJSON_LIB}"
-    ARCHIVE DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}"
-    LIBRARY DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}"
-    RUNTIME DESTINATION "${CMAKE_INSTALL_FULL_BINDIR}"
-    INCLUDES DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+    INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
 )
 if (BUILD_SHARED_AND_STATIC_LIBS)
-    install(TARGETS "${CJSON_LIB}-static" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}")
+    install(TARGETS "${CJSON_LIB}-static" DESTINATION "${CMAKE_INSTALL_LIBDIR}")
 endif()
 if(ENABLE_TARGET_EXPORT)
     # export library information for CMake projects
-    install(EXPORT "${CJSON_LIB}" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/cmake/cJSON")
+    install(EXPORT "${CJSON_LIB}" DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/cJSON")
 endif()

 set_target_properties("${CJSON_LIB}"
@@ -193,19 +193,19 @@ if(ENABLE_CJSON_UTILS)

     install(TARGETS "${CJSON_UTILS_LIB}"
         EXPORT "${CJSON_UTILS_LIB}"
-        ARCHIVE DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}"
-        LIBRARY DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}"
-        RUNTIME DESTINATION "${CMAKE_INSTALL_FULL_BINDIR}"
-        INCLUDES DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+        INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
     )
     if (BUILD_SHARED_AND_STATIC_LIBS)
-        install(TARGETS "${CJSON_UTILS_LIB}-static" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}")
+        install(TARGETS "${CJSON_UTILS_LIB}-static" DESTINATION "${CMAKE_INSTALL_LIBDIR}")
     endif()
-    install(FILES cJSON_Utils.h DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}/cjson")
-    install (FILES "${CMAKE_CURRENT_BINARY_DIR}/libcjson_utils.pc" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/pkgconfig")
+    install(FILES cJSON_Utils.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/cjson")
+    install (FILES "${CMAKE_CURRENT_BINARY_DIR}/libcjson_utils.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
     if(ENABLE_TARGET_EXPORT)
       # export library information for CMake projects
-      install(EXPORT "${CJSON_UTILS_LIB}" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/cmake/cJSON")
+      install(EXPORT "${CJSON_UTILS_LIB}" DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/cJSON")
     endif()

     set_target_properties("${CJSON_UTILS_LIB}"
@@ -226,7 +226,7 @@ if(ENABLE_TARGET_EXPORT)
     # Install package config files
     install(FILES ${PROJECT_BINARY_DIR}/cJSONConfig.cmake
         ${PROJECT_BINARY_DIR}/cJSONConfigVersion.cmake
-        DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/cmake/cJSON")
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/cJSON")
 endif()

 option(ENABLE_CJSON_TEST "Enable building cJSON test" ON)
diff --git a/library_config/cJSONConfig.cmake.in b/library_config/cJSONConfig.cmake.in
index 909f7a9..206566b 100644
--- a/library_config/cJSONConfig.cmake.in
+++ b/library_config/cJSONConfig.cmake.in
@@ -2,8 +2,8 @@
 set(CJSON_UTILS_FOUND @ENABLE_CJSON_UTILS@)

 # The include directories used by cJSON
-set(CJSON_INCLUDE_DIRS "@CMAKE_INSTALL_FULL_INCLUDEDIR@")
-set(CJSON_INCLUDE_DIR "@CMAKE_INSTALL_FULL_INCLUDEDIR@")
+set(CJSON_INCLUDE_DIRS "@CMAKE_INSTALL_INCLUDEDIR@")
+set(CJSON_INCLUDE_DIR "@CMAKE_INSTALL_INCLUDEDIR@")

 get_filename_component(_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)

[albert2004]

I vote for this change. With current state, CMake paths to library are hardcoded and makes it impossible to use in SDKs (for example Yocto build). This is also directly related to pull request: https://github.com/DaveGamble/cJSON/pull/812