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88f4f090a8
If another sublibrary also imports jsoncpp, `FindJsonCpp.cmake` fails with error message `add_library cannot create imported target Jsoncpp_lib because another target with the same name already exists.`. Adding the `if (NOT TARGET Jsoncpp_lib)`-guard fixes this. It might be useful to check if there's a similar problem with other sublibraries included by Drogon.
71 lines
2.6 KiB
CMake
Executable File
71 lines
2.6 KiB
CMake
Executable File
# Find jsoncpp
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#
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# Find the jsoncpp includes and library
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#
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# if you nee to add a custom library search path, do it via via
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# CMAKE_PREFIX_PATH
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#
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# This module defines JSONCPP_INCLUDE_DIRS, where to find header, etc.
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# JSONCPP_LIBRARIES, the libraries needed to use jsoncpp. JSONCPP_FOUND, If
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# false, do not try to use jsoncpp.
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# Jsoncpp_lib - The imported target library.
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# only look in default directories
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find_path(JSONCPP_INCLUDE_DIRS
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NAMES json/json.h
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DOC "jsoncpp include dir"
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PATH_SUFFIXES jsoncpp)
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find_library(JSONCPP_LIBRARIES NAMES jsoncpp DOC "jsoncpp library")
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# debug library on windows same naming convention as in qt (appending debug
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# library with d) boost is using the same "hack" as us with "optimized" and
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# "debug" if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
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# find_library(JSONCPP_LIBRARIES_DEBUG NAMES jsoncppd DOC "jsoncpp debug
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# library") if("${JSONCPP_LIBRARIES_DEBUG}" STREQUAL "JSONCPP_LIBRARIES_DEBUG-
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# NOTFOUND") set(JSONCPP_LIBRARIES_DEBUG ${JSONCPP_LIBRARIES}) endif()
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# set(JSONCPP_LIBRARIES optimized ${JSONCPP_LIBRARIES} debug
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# ${JSONCPP_LIBRARIES_DEBUG})
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# endif()
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# handle the QUIETLY and REQUIRED arguments and set JSONCPP_FOUND to TRUE if all
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# listed variables are TRUE, hide their existence from configuration view
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(Jsoncpp
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DEFAULT_MSG
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JSONCPP_INCLUDE_DIRS
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JSONCPP_LIBRARIES)
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mark_as_advanced(JSONCPP_INCLUDE_DIRS JSONCPP_LIBRARIES)
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if(Jsoncpp_FOUND)
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if(NOT EXISTS ${JSONCPP_INCLUDE_DIRS}/json/version.h)
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message(FATAL_ERROR "Error: jsoncpp lib is too old.....stop")
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endif()
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if(NOT WIN32)
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exec_program(
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cat
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ARGS
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"${JSONCPP_INCLUDE_DIRS}/json/version.h |grep JSONCPP_VERSION_STRING|sed s'/.*define/define/'|awk '{printf $3}'|sed s'/\"//g'"
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OUTPUT_VARIABLE
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jsoncpp_ver)
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message(STATUS "jsoncpp verson:" ${jsoncpp_ver})
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if(jsoncpp_ver LESS 1.7)
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message(
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FATAL_ERROR
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"jsoncpp lib is too old, please get new version from https://github.com/open-source-parsers/jsoncpp"
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)
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endif(jsoncpp_ver LESS 1.7)
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endif()
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if (NOT TARGET Jsoncpp_lib)
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add_library(Jsoncpp_lib INTERFACE IMPORTED)
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endif()
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set_target_properties(Jsoncpp_lib
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PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
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"${JSONCPP_INCLUDE_DIRS}"
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INTERFACE_LINK_LIBRARIES
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"${JSONCPP_LIBRARIES}")
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endif(Jsoncpp_FOUND)
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