chore: do not hardcode the library version in cpp/CMakeLists.txt

Author: johnbartholomew

core/CMakeLists.txt

@@ -34,6 +34,8 @@ add_library(libjsonnet SHARED ${LIBJSONNET_HEADERS} ${LIBJSONNET_SOURCE})
 add_dependencies(libjsonnet md5 stdlib)
 target_link_libraries(libjsonnet md5 nlohmann_json::nlohmann_json ryml)
 
+# Version extraction logic duplicated in ../cpp/CMakeLists.txt
+# TODO: Put this logic somewhere else.
 file(STRINGS ${CMAKE_CURRENT_SOURCE_DIR}/../include/libjsonnet.h JSONNET_VERSION_DEF
      REGEX "[#]define[ \t]+LIB_JSONNET_VERSION[ \t]+")
 string(REGEX REPLACE ".*\"v([^\"]+)\".*" "\\1" JSONNET_VERSION ${JSONNET_VERSION_DEF})

cpp/CMakeLists.txt

@@ -12,10 +12,17 @@ add_library(libjsonnet++ SHARED ${LIBJSONNETPP_HEADERS} ${LIBJSONNETPP_SOURCE})
 add_dependencies(libjsonnet++ jsonnet)
 target_link_libraries(libjsonnet++ libjsonnet)
 
+# Version extraction logic duplicated from ../core/CMakeLists.txt
+# TODO: Put this logic somewhere else.
+file(STRINGS ${CMAKE_CURRENT_SOURCE_DIR}/../include/libjsonnet.h JSONNET_VERSION_DEF
+     REGEX "[#]define[ \t]+LIB_JSONNET_VERSION[ \t]+")
+string(REGEX REPLACE ".*\"v([^\"]+)\".*" "\\1" JSONNET_VERSION ${JSONNET_VERSION_DEF})
+message("Extracted Jsonnet version: " ${JSONNET_VERSION})
+
 # CMake prepends CMAKE_SHARED_LIBRARY_PREFIX to shared libraries, so without
 # this step the output would be |liblibjsonnet|.
 set_target_properties(libjsonnet++ PROPERTIES OUTPUT_NAME jsonnet++
-	VERSION     "0.21.0"
+	VERSION     "${JSONNET_VERSION}"
 	SOVERSION   "0"
 	PUBLIC_HEADER "${LIB_HEADER}")
 install(TARGETS libjsonnet++