add basic cmake support

cmake/Modules/FindLibtorrentRasterbar.cmake

@@ -0,0 +1,93 @@
+# - Try to find libtorrent-rasterbar
+#
+# If not using pkg-config, you can pre-set LibtorrentRasterbar_CUSTOM_DEFINITIONS
+# for definitions unrelated to Boost's separate compilation (which are already
+# decided by the LibtorrentRasterbar_USE_STATIC_LIBS variable).
+#
+# Once done this will define
+#  LibtorrentRasterbar_FOUND - System has libtorrent-rasterbar
+#  LibtorrentRasterbar_INCLUDE_DIRS - The libtorrent-rasterbar include directories
+#  LibtorrentRasterbar_LIBRARIES - The libraries needed to use libtorrent-rasterbar
+#  LibtorrentRasterbar_DEFINITIONS - Compiler switches required for using libtorrent-rasterbar
+#  LibtorrentRasterbar_OPENSSL_ENABLED - libtorrent-rasterbar uses and links against OpenSSL
+
+find_package(Threads REQUIRED)
+find_package(PkgConfig QUIET)
+
+if(PKG_CONFIG_FOUND)
+    pkg_check_modules(PC_LIBTORRENT_RASTERBAR QUIET libtorrent-rasterbar)
+endif()
+
+if(LibtorrentRasterbar_USE_STATIC_LIBS)
+    set(LibtorrentRasterbar_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
+    set(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_STATIC_LIBRARY_SUFFIX})
+endif()
+
+if(PC_LIBTORRENT_RASTERBAR_FOUND)
+    set(LibtorrentRasterbar_DEFINITIONS ${PC_LIBTORRENT_RASTERBAR_CFLAGS})
+else()
+    if(LibtorrentRasterbar_CUSTOM_DEFINITIONS)
+        set(LibtorrentRasterbar_DEFINITIONS ${LibtorrentRasterbar_CUSTOM_DEFINITIONS})
+    else()
+        # Without pkg-config, we can't possibly figure out the correct build flags.
+        # libtorrent is very picky about those. Let's take a set of defaults and
+        # hope that they apply. If not, you the user are on your own.
+        set(LibtorrentRasterbar_DEFINITIONS
+            -DTORRENT_USE_OPENSSL
+            -DTORRENT_DISABLE_GEO_IP
+            -DBOOST_ASIO_ENABLE_CANCELIO
+            -DUNICODE -D_UNICODE -D_FILE_OFFSET_BITS=64)
+    endif()
+
+    if(NOT LibtorrentRasterbar_USE_STATIC_LIBS)
+        list(APPEND LibtorrentRasterbar_DEFINITIONS
+            -DTORRENT_LINKING_SHARED
+            -DBOOST_SYSTEM_DYN_LINK -DBOOST_CHRONO_DYN_LINK)
+    endif()
+endif()
+
+message(STATUS "libtorrent definitions: ${LibtorrentRasterbar_DEFINITIONS}")
+
+find_path(LibtorrentRasterbar_INCLUDE_DIR libtorrent
+          HINTS ${PC_LIBTORRENT_RASTERBAR_INCLUDEDIR} ${PC_LIBTORRENT_RASTERBAR_INCLUDE_DIRS}
+          PATH_SUFFIXES libtorrent-rasterbar)
+
+find_library(LibtorrentRasterbar_LIBRARY NAMES torrent-rasterbar libtorrent
+             HINTS ${PC_LIBTORRENT_RASTERBAR_LIBDIR} ${PC_LIBTORRENT_RASTERBAR_LIBRARY_DIRS})
+
+if(LibtorrentRasterbar_USE_STATIC_LIBS)
+    set(CMAKE_FIND_LIBRARY_SUFFIXES ${LibtorrentRasterbar_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES})
+endif()
+
+set(LibtorrentRasterbar_LIBRARIES ${LibtorrentRasterbar_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
+set(LibtorrentRasterbar_INCLUDE_DIRS ${LibtorrentRasterbar_INCLUDE_DIR})
+
+if(NOT Boost_SYSTEM_FOUND OR NOT Boost_CHRONO_FOUND OR NOT Boost_RANDOM_FOUND)
+    find_package(Boost REQUIRED COMPONENTS date_time system chrono random thread)
+    set(LibtorrentRasterbar_LIBRARIES
+        ${LibtorrentRasterbar_LIBRARIES} ${Boost_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+    set(LibtorrentRasterbar_INCLUDE_DIRS
+        ${LibtorrentRasterbar_INCLUDE_DIRS} ${Boost_INCLUDE_DIRS})
+endif()
+
+list(FIND LibtorrentRasterbar_DEFINITIONS -DTORRENT_USE_OPENSSL LibtorrentRasterbar_ENCRYPTION_INDEX)
+if(LibtorrentRasterbar_ENCRYPTION_INDEX GREATER -1)
+    find_package(OpenSSL REQUIRED)
+    set(LibtorrentRasterbar_LIBRARIES ${LibtorrentRasterbar_LIBRARIES} ${OPENSSL_LIBRARIES})
+    set(LibtorrentRasterbar_INCLUDE_DIRS ${LibtorrentRasterbar_INCLUDE_DIRS} ${OPENSSL_INCLUDE_DIRS})
+    set(LibtorrentRasterbar_OPENSSL_ENABLED ON)
+endif()
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set LibtorrentRasterbar_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args(LibtorrentRasterbar DEFAULT_MSG
+                                  LibtorrentRasterbar_LIBRARY
+                                  LibtorrentRasterbar_INCLUDE_DIR
+                                  Boost_SYSTEM_FOUND
+                                  Boost_CHRONO_FOUND
+                                  Boost_RANDOM_FOUND)
+
+mark_as_advanced(LibtorrentRasterbar_INCLUDE_DIR LibtorrentRasterbar_LIBRARY
+    LibtorrentRasterbar_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES
+    LibtorrentRasterbar_ENCRYPTION_INDEX)