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include(CheckSymbolExists)
include(CMakePushCheckState)
cmake_push_check_state()
# The name of the library that performs name resolution, suitable for giving to the "-l" link flag
set(RESOLVE_LIB_NAME)
# If TRUE, then the C runtime provides the name resolution that we need
set(resolve_is_libc FALSE)
if(WIN32)
set(RESOLVE_LIB_NAME Dnsapi)
set(_MONGOC_HAVE_DNSAPI 1)
else()
# Try to find the search functions for various configurations.
# Headers required by minimum on the strictest system: (Tested on FreeBSD 13)
set(resolve_headers netinet/in.h sys/types.h arpa/nameser.h resolv.h)
set(CMAKE_REQUIRED_LIBRARIES resolv)
check_symbol_exists(res_nsearch "${resolve_headers}" _MONGOC_HAVE_RES_NSEARCH_RESOLV)
check_symbol_exists(res_search "${resolve_headers}" _MONGOC_HAVE_RES_SEARCH_RESOLV)
check_symbol_exists(res_ndestroy "${resolve_headers}" _MONGOC_HAVE_RES_NDESTROY_RESOLV)
check_symbol_exists(res_nclose "${resolve_headers}" _MONGOC_HAVE_RES_NCLOSE_RESOLV)
if(
(_MONGOC_HAVE_RES_NSEARCH_RESOLV
AND (_MONGOC_HAVE_RES_NDESTROY_RESOLV OR _MONGOC_HAVE_RES_NCLOSE_RESOLV))
OR _MONGOC_HAVE_RES_SEARCH_RESOLV
)
set(RESOLVE_LIB_NAME resolv)
else()
# Can we use name resolution with just libc?
unset(CMAKE_REQUIRED_LIBRARIES)
check_symbol_exists(res_nsearch "${resolve_headers}" _MONGOC_HAVE_RES_NSEARCH_NOLINK)
check_symbol_exists(res_search "${resolve_headers}" _MONGOC_HAVE_RES_SEARCH_NOLINK)
check_symbol_exists(res_ndestroy "${resolve_headers}" _MONGOC_HAVE_RES_NDESTROY_NOLINK)
check_symbol_exists(res_nclose "${resolve_headers}" _MONGOC_HAVE_RES_NCLOSE_NOLINK)
if(
(_MONGOC_HAVE_RES_NSEARCH_NOLINK
AND (_MONGOC_HAVE_RES_NDESTROY_NOLINK OR _MONGOC_HAVE_RES_NCLOSE_NOLINK))
OR _MONGOC_HAVE_RES_SEARCH_NOLINK
)
set(resolve_is_libc TRUE)
message(VERBOSE "Name resolution is provided by the C runtime")
endif()
endif()
endif()
mongo_pick(MONGOC_HAVE_DNSAPI 1 0 _MONGOC_HAVE_DNSAPI)
mongo_pick(MONGOC_HAVE_RES_NSEARCH 1 0 [[_MONGOC_HAVE_RES_NSEARCH_NOLINK OR _MONGOC_HAVE_RES_NSEARCH_RESOLV]])
mongo_pick(MONGOC_HAVE_RES_SEARCH 1 0 [[_MONGOC_HAVE_RES_SEARCH_NOLINK OR _MONGOC_HAVE_RES_SEARCH_RESOLV]])
mongo_pick(MONGOC_HAVE_RES_NDESTROY 1 0 [[_MONGOC_HAVE_RES_NDESTROY_NOLINK OR _MONGOC_HAVE_RES_NDESTROY_RESOLV]])
mongo_pick(MONGOC_HAVE_RES_NCLOSE 1 0 [[_MONGOC_HAVE_RES_NCLOSE_NOLINK OR _MONGOC_HAVE_RES_NCLOSE_RESOLV]])
if(RESOLVE_LIB_NAME OR resolve_is_libc)
# Define the resolver interface:
add_library(_mongoc-resolve INTERFACE)
add_library(mongo::detail::c_resolve ALIAS _mongoc-resolve)
set_target_properties(_mongoc-resolve PROPERTIES
INTERFACE_LINK_LIBRARIES "${RESOLVE_LIB_NAME}"
EXPORT_NAME detail::c_resolve)
install(TARGETS _mongoc-resolve EXPORT mongoc-targets)
endif()
cmake_pop_check_state()
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