cmake: Link against libjson-c

block uses libblob_msgjson which requires us to link against libjson-c.
Some external toolchains would be failing to find that library unless
specified explicitly.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9a5a583..7db28c0 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,12 +53,14 @@ ADD_EXECUTABLE(mount_root mount_root.c)
 TARGET_LINK_LIBRARIES(mount_root fstools)
 INSTALL(TARGETS mount_root RUNTIME DESTINATION sbin)
 
+find_library(json NAMES json-c json)
+
 ADD_EXECUTABLE(block block.c)
 IF(DEFINED CMAKE_UBIFS_EXTROOT)
        ADD_DEFINITIONS(-DUBIFS_EXTROOT)
-       TARGET_LINK_LIBRARIES(block blkid-tiny uci ubox blobmsg_json ubi-utils)
+       TARGET_LINK_LIBRARIES(block blkid-tiny uci ubox blobmsg_json ubi-utils ${json})
 ELSE(DEFINED CMAKE_UBIFS_EXTROOT)
-       TARGET_LINK_LIBRARIES(block blkid-tiny uci ubox blobmsg_json)
+       TARGET_LINK_LIBRARIES(block blkid-tiny uci ubox blobmsg_json ${json})
 ENDIF(DEFINED CMAKE_UBIFS_EXTROOT)
 INSTALL(TARGETS block RUNTIME DESTINATION sbin)