build: add liblmdb to the cmake autodetection system

update for rebase (warptangent 2015-01-04)
  src/cryptonote_core/CMakeLists.txt (edit)
  - replace LMDB_LIBRARIES with LMDB_LIBRARY set from autodetection

CMakeLists.txt

@@ -138,8 +138,8 @@ link_directories(${UNBOUND_LIBRARY_DIRS})
 # Final setup for rapidjson
 include_directories(external/rapidjson)
 
-# TODO: make this find lmdb similarly to how unbound and boost are handled
+find_package(LMDB REQUIRED)
-set(LMDB_LIBRARIES "-llmdb")
+include_directories(${LMDB_INCLUDE})
 
 if(MSVC)
   add_definitions("/bigobj /MP /W3 /GS- /D_CRT_SECURE_NO_WARNINGS /wd4996 /wd4345 /D_WIN32_WINNT=0x0600 /DWIN32_LEAN_AND_MEAN /DGTEST_HAS_TR1_TUPLE=0 /FIinline_c.h /D__SSE4_1__")

cmake/FindLMDB.cmake

@@ -0,0 +1,61 @@
+# Copyright (c) 2014, The Monero Project
+# All rights reserved.
+# 
+# Redistribution and use in source and binary forms, with or without modification, are
+# permitted provided that the following conditions are met:
+# 
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+# 
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list
+#    of conditions and the following disclaimer in the documentation and/or other
+#    materials provided with the distribution.
+# 
+# 3. Neither the name of the copyright holder nor the names of its contributors may be
+#    used to endorse or promote products derived from this software without specific
+#    prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+MESSAGE(STATUS "Looking for liblmdb")
+
+FIND_PATH(LMDB_INCLUDE_DIR
+  NAMES lmdb.h
+  PATH_SUFFIXES include/ include/lmdb/
+  PATHS "${PROJECT_SOURCE_DIR}"
+  ${LMDB_ROOT}
+  $ENV{LMDB_ROOT}
+  /usr/local/
+  /usr/
+)
+
+if(STATIC)
+  if(MINGW)
+    find_library(LMDB_LIBRARIES liblmdb.dll.a)
+  else()
+    find_library(LMDB_LIBRARIES liblmdb.a)
+  endif()
+else()
+  find_library(LMDB_LIBRARIES lmdb)
+endif()
+
+IF(LMDB_INCLUDE_DIR)
+  MESSAGE(STATUS "Found liblmdb include (lmdb.h) in ${LMDB_INCLUDE_DIR}")
+  IF(LMDB_LIBRARIES)
+    MESSAGE(STATUS "Found liblmdb library")
+    set(LMDB_INCLUDE ${LMDB_INCLUDE_DIR})
+    set(LMDB_LIBRARY ${LMDB_LIBRARIES})
+  ELSE()
+    MESSAGE(FATAL_ERROR "${BoldRed}Could not find liblmdb library, please make sure you have installed liblmdb or liblmdb-dev or the equivalent${ColourReset}")
+  ENDIF()
+ELSE()
+  MESSAGE(FATAL_ERROR "${BoldRed}Could not find liblmdb library, please make sure you have installed liblmdb or liblmdb-dev or the equivalent${ColourReset}")
+ENDIF()

src/cryptonote_core/CMakeLists.txt

@@ -83,5 +83,5 @@ target_link_libraries(cryptonote_core
     ${Boost_FILESYSTEM_LIBRARY}
     ${Boost_SYSTEM_LIBRARY}
     ${Boost_THREAD_LIBRARY}
-    ${LMDB_LIBRARIES}
+    ${LMDB_LIBRARY}
     ${EXTRA_LIBRARIES})