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Check for functions we use when looking for system libutp (#4072) 

Since libutp provides no version information, and one readily noticeable
change between the old and the new API is the change in public function
names, check to see if the functions we use are available. Old version
won't have them, and so any old system libutp will be discarded in AUTO
mode and result in an error in ON mode for USE_SYSTEM_UTP option.
This commit is contained in:
Mike Gelfand 2022-11-02 12:03:57 +01:00 committed by GitHub
parent 2ca095d4a8
commit 49a3813a23
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1 changed files with 48 additions and 0 deletions
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48
cmake/FindUTP.cmake
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@ -15,6 +15,54 @@ endif()
find_path(UTP_INCLUDE_DIR NAMES libutp/utp.h HINTS ${_UTP_INCLUDEDIR})
find_library(UTP_LIBRARY NAMES utp HINTS ${_UTP_LIBDIR})
if(UTP_INCLUDE_DIR AND UTP_LIBRARY)
include(CheckSymbolExists)
set(_UTP_FUNCS
utp_check_timeouts
utp_close
utp_connect
utp_context_get_userdata
utp_context_set_option
utp_context_set_userdata
utp_create_socket
utp_destroy
utp_getpeername
utp_get_userdata
utp_init
utp_issue_deferred_acks
utp_process_udp
utp_read_drained
utp_set_callback
utp_set_userdata
utp_write
utp_writev
)
set(_UTP_OLD_CMAKE_REQUIRED_INCLUDES "${CMAKE_REQUIRED_INCLUDES}")
set(_UTP_OLD_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
set(_UTP_OLD_CMAKE_REQUIRED_QUIET "${CMAKE_REQUIRED_QUIET}")
set(CMAKE_REQUIRED_INCLUDES "${UTP_INCLUDE_DIR}")
set(CMAKE_REQUIRED_LIBRARIES "${UTP_LIBRARY}")
set(CMAKE_REQUIRED_QUIET ON)
foreach(_UTP_FUNC IN LISTS _UTP_FUNCS)
string(MAKE_C_IDENTIFIER "HAVE_${_UTP_FUNC}" _UTP_FUNC_VAR)
string(TOUPPER "${_UTP_FUNC_VAR}" _UTP_FUNC_VAR)
check_symbol_exists(${_UTP_FUNC} libutp/utp.h ${_UTP_FUNC_VAR})
if(NOT ${_UTP_FUNC_VAR})
unset(UTP_INCLUDE_DIR CACHE)
unset(UTP_LIBRARY CACHE)
break()
endif()
endforeach()
set(CMAKE_REQUIRED_INCLUDES "${_UTP_OLD_CMAKE_REQUIRED_INCLUDES}")
set(CMAKE_REQUIRED_LIBRARIES "${_UTP_OLD_CMAKE_REQUIRED_LIBRARIES}")
set(CMAKE_REQUIRED_QUIET "${_UTP_OLD_CMAKE_REQUIRED_QUIET}")
endif()
set(UTP_INCLUDE_DIRS ${UTP_INCLUDE_DIR})
set(UTP_LIBRARIES ${UTP_LIBRARY})