Allow to use the third party of the os

cmake options:
 -DUSE_SYSTEM_CLI11 for CLI11 lib
 -DUSE_SYSTEM_FMT for the fmt lib
 -DUSE_SYSTEM_XXHASH for the xxHash lib

CMakeLists.txt

@@ -1,6 +1,6 @@
 #   BAREOS® - Backup Archiving REcovery Open Sourced
 #
-#   Copyright (C) 2019-2022 Bareos GmbH & Co. KG
+#   Copyright (C) 2019-2023 Bareos GmbH & Co. KG
 #
 #   This program is Free Software; you can redistribute it and/or
 #   modify it under the terms of version three of the GNU Affero General Public
@@ -53,6 +53,9 @@ include(CTest)
 option(BUILD_UNIVERSAL_CLIENT
        "Override build-options to produce a limited, but universal client" OFF
 )
+option(USE_SYSTEM_CLI11 "Use the CLI11 lib of the operating system" OFF)
+option(USE_SYSTEM_FMT "Use the fmt lib of the operating system" OFF)
+option(USE_SYSTEM_XXHASH "Use the xxHash lib of the operating system" OFF)
 if(BUILD_UNIVERSAL_CLIENT)
   if(CMAKE_VERSION VERSION_LESS 3.18.0)
     message(

core/cmake/BareosFindAllLibraries.cmake

@@ -187,4 +187,18 @@ if(ENABLE_JANSSON)
   find_package(Jansson)
 endif()
 
+if(USE_SYSTEM_CLI11)
+  find_package(CLI11 "2.2.0" CONFIG REQUIRED)
+  message(STATUS "Using system CLI11 ${CLI11_VERSION}")
+endif()
+if(USE_SYSTEM_FMT)
+  find_package(fmt "6.2.1" CONFIG REQUIRED)
+  message(STATUS "Using system fmt ${fmt_VERSION}")
+endif()
+if(USE_SYSTEM_XXHASH)
+  find_package(PkgConfig REQUIRED)
+  pkg_search_module(XXHASH REQUIRED IMPORTED_TARGET xxhash>=0.8.1)
+  message(STATUS "Using system xxHash ${XXHASH_VERSION}")
+endif()
+
 include(thread)

core/src/lib/CMakeLists.txt

@@ -152,11 +152,21 @@ target_compile_definitions(
           -DBAREOS_YEAR="${BAREOS_YEAR}"
 )
 
-target_link_libraries(
-  bareos
-  PRIVATE bareosfastlz ${OPENSSL_LIBRARIES} Threads::Threads ${ZLIB_LIBRARIES}
-          ${LZO2_LIBRARIES} ${CAM_LIBRARIES} CLI11::CLI11 xxHash::xxhash
-)
+if(NOT USE_SYSTEM_XXHASH)
+  target_link_libraries(
+    bareos
+    PRIVATE bareosfastlz ${OPENSSL_LIBRARIES} Threads::Threads
+            ${ZLIB_LIBRARIES} ${LZO2_LIBRARIES} ${CAM_LIBRARIES} CLI11::CLI11
+            xxHash::xxhash
+  )
+else()
+  target_link_libraries(
+    bareos
+    PRIVATE bareosfastlz ${OPENSSL_LIBRARIES} Threads::Threads
+            ${ZLIB_LIBRARIES} ${LZO2_LIBRARIES} ${CAM_LIBRARIES} CLI11::CLI11
+            ${XXHASH_LIBRARIES}
+  )
+endif()
 
 if(CMAKE_CXX_FLAGS MATCHES "-fsanitize=address"
    AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU"

third-party/CMakeLists.txt

@@ -19,6 +19,12 @@
 
 message("Entering ${CMAKE_CURRENT_SOURCE_DIR}")
 
-add_subdirectory(CLI11 EXCLUDE_FROM_ALL)
-add_subdirectory(fmt EXCLUDE_FROM_ALL)
-include(./xxHash.cmake)
+if(NOT USE_SYSTEM_CLI11)
+  add_subdirectory(CLI11 EXCLUDE_FROM_ALL)
+endif()
+if(NOT USE_SYSTEM_FMT)
+  add_subdirectory(fmt EXCLUDE_FROM_ALL)
+endif()
+if(NOT USE_SYSTEM_XXHASH)
+  include(./xxHash.cmake)
+endif()