minimal-examples/dbus-client/minimal-dbus-client/CMakeLists.txt

   1 cmake_minimum_required(VERSION 2.8)
   2 include(CheckCSourceCompiles)
   3 include(CheckLibraryExists)
   4
   5 set(SAMP lws-minimal-dbus-client)
   6 set(SRCS minimal-dbus-client.c)
   7
   8 if (NOT LWS_WITH_MINIMAL_EXAMPLES)
   9         CHECK_LIBRARY_EXISTS(dbus-1 dbus_connection_set_watch_functions "" LWS_HAVE_LIBDBUS)
  10         if (NOT LWS_HAVE_LIBDBUS)
  11                 message(FATAL_ERROR "Install dbus-devel, or libdbus-1-dev etc")
  12         endif()
  13
  14         if (NOT LWS_DBUS_LIB)
  15                 set(LWS_DBUS_LIB "dbus-1")
  16         endif()
  17
  18         if (NOT LWS_DBUS_INCLUDE1)
  19                 # look in fedora and debian / ubuntu place
  20                 if (EXISTS "/usr/include/dbus-1.0")
  21                         set(LWS_DBUS_INCLUDE1 "/usr/include/dbus-1.0")
  22                 else()
  23                         message(FATAL_ERROR "Set LWS_DBUS_INCLUDE1 to /usr/include/dbus-1.0 or wherever the main dbus includes are")
  24                 endif()
  25         endif()
  26
  27         if (NOT LWS_DBUS_INCLUDE2)
  28                 # look in fedora... debian / ubuntu has the ARCH in the path...
  29                 if (EXISTS "/usr/lib64/dbus-1.0/include")
  30                         set(LWS_DBUS_INCLUDE2 "/usr/lib64/dbus-1.0/include")
  31                 else()
  32                         message(FATAL_ERROR "Set LWS_DBUS_INCLUDE2 to /usr/lib/ARCH-linux-gnu/dbus-1.0/include or wherever dbus-arch-deps.h is on your system")
  33                 endif()
  34         endif()
  35
  36         set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES};${LWS_DBUS_INCLUDE1};${LWS_DBUS_INCLUDE2})
  37
  38         if (NOT LWS_DBUS_INCLUDE1 OR NOT LWS_DBUS_INCLUDE2)
  39                 message(FATAL_ERROR "To build with libdbus, LWS_DBUS_INCLUDE1/2 must be given. See lib/roles/dbus/README.md")
  40         endif()
  41
  42 endif()
  43
  44 # If we are being built as part of lws, confirm current build config supports
  45 # reqconfig, else skip building ourselves.
  46 #
  47 # If we are being built externally, confirm installed lws was configured to
  48 # support reqconfig, else error out with a helpful message about the problem.
  49 #
  50 MACRO(require_lws_config reqconfig _val result)
  51
  52         if (DEFINED ${reqconfig})
  53         if (${reqconfig})
  54                 set (rq 1)
  55         else()
  56                 set (rq 0)
  57         endif()
  58         else()
  59                 set(rq 0)
  60         endif()
  61
  62         if (${_val} EQUAL ${rq})
  63                 set(SAME 1)
  64         else()
  65                 set(SAME 0)
  66         endif()
  67
  68         if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME})
  69                 if (${_val})
  70                         message("${SAMP}: skipping as lws being built without ${reqconfig}")
  71                 else()
  72                         message("${SAMP}: skipping as lws built with ${reqconfig}")
  73                 endif()
  74                 set(${result} 0)
  75         else()
  76                 if (LWS_WITH_MINIMAL_EXAMPLES)
  77                         set(MET ${SAME})
  78                 else()
  79                         CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig})
  80                         if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig})
  81                                 set(HAS_${reqconfig} 0)
  82                         else()
  83                                 set(HAS_${reqconfig} 1)
  84                         endif()
  85                         if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val}))
  86                                 set(MET 1)
  87                         else()
  88                                 set(MET 0)
  89                         endif()
  90                 endif()
  91                 if (NOT MET)
  92                         if (${_val})
  93                                 message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}")
  94                         else()
  95                                 message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project")
  96                         endif()
  97                 endif()
  98
  99         endif()
 100 ENDMACRO()
 101
 102
 103 set(requirements 1)
 104 require_lws_config(LWS_ROLE_DBUS 1 requirements)
 105 require_lws_config(LWS_WITHOUT_CLIENT 0 requirements)
 106
 107 if (requirements)
 108         add_executable(${SAMP} ${SRCS})
 109
 110         include_directories("${LWS_DBUS_INCLUDE1}")
 111         include_directories("${LWS_DBUS_INCLUDE2}")
 112         list(APPEND LIB_LIST dbus-1)
 113
 114         if (websockets_shared)
 115                 target_link_libraries(${SAMP} websockets_shared)
 116                 add_dependencies(${SAMP} websockets_shared ${LWS_DBUS_LIB})
 117         else()
 118                 target_link_libraries(${SAMP} websockets ${LWS_DBUS_LIB})
 119         endif()
 120 endif()