cmake: find MySQL client lib

This change introduces a CMake-style FindMySQL.cmake properly looking for
libmysqlclient_r with mysql_config.  This also fixes linking on some
machines.

Change-Id: Ifdbfdc3c7440dead37a8b63aaa86732d636aa0e2

tools/import-trace/CMakeLists.txt

@@ -17,13 +17,14 @@ if (BUILD_LLVM_DISASSEMBLER)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LLVM_CXX_FLAGS} -fexceptions")
 endif(BUILD_LLVM_DISASSEMBLER)
 
-
+find_package(MySQL REQUIRED)
+include_directories(${MYSQL_INCLUDE_DIR})
 
 add_executable(import-trace main.cc ${SRCS})
 
 target_link_libraries(import-trace 
   ${PROTOBUF_LIBRARY} 
-  -lmysqlclient 
+  ${MYSQL_LIBRARIES}
   fail-util 
   fail-comm
   fail-sal)

tools/prune-trace/CMakeLists.txt

@@ -3,7 +3,10 @@ set(SRCS
   BasicPruner.cc
 )
 
+find_package(MySQL REQUIRED)
+include_directories(${MYSQL_INCLUDE_DIR})
+
 ## This is the example's campaign server distributing experiment parameters
 add_executable(prune-trace main.cc ${SRCS})
-target_link_libraries(prune-trace -lmysqlclient fail-util)
+target_link_libraries(prune-trace ${MYSQL_LIBRARIES} fail-util)
 install(TARGETS prune-trace RUNTIME DESTINATION bin)