* detect redis library presence

CMakeLists.txt

@@ -10,6 +10,7 @@ option(WITH_CLIENT    "Simple client for configuring daemon" ON)
 option(WITH_CSOCKET   "Unix control socket support for daemon" ON)
 option(WITH_HARDENING "Enable hardening options" OFF)
 option(WITH_PCRE      "Build pcre-compatible filter" ON)
+option(WITH_REDIS     "Build redis backend" ON)
 
 if (NOT DEFINED CMAKE_INSTALL_PREFIX)
   set(CMAKE_INSTALL_PREFIX "/usr")

src/backends/CMakeLists.txt

@@ -4,10 +4,12 @@ set(BACKENDS "")
 add_library("f2b_backend_exec" MODULE "exec.c")
 list(APPEND BACKENDS "f2b_backend_exec")
 
-# TODO: check if library available
-add_library("f2b_backend_redis" MODULE "redis.c")
-target_link_libraries("f2b_backend_redis" "hiredis")
-list(APPEND BACKENDS "f2b_backend_redis")
+find_library(REDIS_FOUND "pcre")
+if (WITH_REDIS AND REDIS_FOUND)
+  add_library("f2b_backend_redis" MODULE "redis.c")
+  target_link_libraries("f2b_backend_redis" "hiredis")
+  list(APPEND BACKENDS "f2b_backend_redis")
+endif ()
 
 message(STATUS "- Backends : ${BACKENDS}")