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# Use FetchContent to obtain bson and mongoc.
include(FetchContent)
function(fetch_mongoc)
message(STATUS "Downloading and configuring MongoDB C Driver ${MONGOC_DOWNLOAD_VERSION}...")
set(fetch_args "")
if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.25.0")
list(APPEND fetch_args "SYSTEM")
endif()
# Declare mongo-c-driver as a dependency
FetchContent_Declare(
mongo-c-driver
GIT_REPOSITORY https://github.com/mongodb/mongo-c-driver.git
GIT_TAG ${MONGOC_DOWNLOAD_VERSION}
${fetch_args}
)
FetchContent_GetProperties(mongo-c-driver)
if(NOT mongo-c-driver_POPULATED)
# Must ensure BUILD_VERSION is not inherited either as a normal variable or as a cache variable.
unset(BUILD_VERSION)
unset(OLD_CACHE_BUILD_VERSION)
if(DEFINED CACHE{BUILD_VERSION})
set(OLD_CACHE_BUILD_VERSION $CACHE{BUILD_VERSION})
unset(BUILD_VERSION CACHE)
endif()
# Disable unnecessary targets and potential conflicts with C++ Driver options.
set(ENABLE_TESTS OFF)
set(BUILD_TESTING OFF)
string(REPLACE " -Werror" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REPLACE " -Werror" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
FetchContent_MakeAvailable(mongo-c-driver)
# Restore prior value of BUILD_VERSION cache variable only if was previously set.
if(DEFINED OLD_CACHE_BUILD_VERSION)
set(BUILD_VERSION ${OLD_CACHE_BUILD_VERSION} CACHE STRING "Library version (for both bsoncxx and mongocxx)")
endif()
endif()
message(STATUS "Downloading and configuring MongoDB C Driver ${MONGOC_DOWNLOAD_VERSION}... done.")
endfunction()
set(NEED_DOWNLOAD_C_DRIVER false CACHE INTERNAL "")
# Only search for packages if targets are not already imported via add_subdirectory().
if(NOT ((TARGET bson_shared OR TARGET bson_static) AND (TARGET mongoc_shared OR TARGET mongoc_static)))
# Both libraries are required.
find_package(bson ${BSON_REQUIRED_VERSION} QUIET)
if(NOT bson_FOUND)
message(STATUS "find_package(bson ${BSON_REQUIRED_VERSION}) did not succeed")
endif()
find_package(mongoc ${MONGOC_REQUIRED_VERSION} QUIET)
if(NOT mongoc_FOUND)
message(STATUS "find_package(mongoc ${MONGOC_REQUIRED_VERSION}) did not succeed")
endif()
if(NOT bson_FOUND OR NOT mongoc_FOUND)
set_property(CACHE NEED_DOWNLOAD_C_DRIVER PROPERTY VALUE true)
message(STATUS "Required MongoDB C Driver libraries not found via find_package()")
endif()
endif()
if($CACHE{NEED_DOWNLOAD_C_DRIVER})
message(STATUS "MongoDB C Driver library sources will be downloaded from GitHub")
fetch_mongoc()
endif()
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