cmake/modules/FindCARES.cmake

   1 #
   2 # - Find cares
   3 # Find the native CARES includes and library
   4 #
   5 #  CARES_INCLUDE_DIRS - where to find cares.h, etc.
   6 #  CARES_LIBRARIES    - List of libraries when using cares.
   7 #  CARES_FOUND        - True if cares found.
   8 #  CARES_DLL_DIR      - (Windows) Path to the c-ares DLL.
   9 #  CARES_DLL          - (Windows) Name of the c-ares DLL.
  10
  11
  12 IF (CARES_INCLUDE_DIRS)
  13   # Already in cache, be silent
  14   SET(CARES_FIND_QUIETLY TRUE)
  15 ENDIF (CARES_INCLUDE_DIRS)
  16
  17 INCLUDE(FindWSWinLibs)
  18 FindWSWinLibs("c-ares-.*" "CARES_HINTS")
  19
  20 find_path( CARES_INCLUDE_DIR
  21   NAMES ares.h
  22   PATH_SUFFIXES
  23         include
  24   HINTS
  25     "${CARES_INCLUDEDIR}"
  26     "${CARES_HINTS}"
  27 )
  28
  29 find_library( CARES_LIBRARY
  30   NAMES cares libcares-2
  31   PATH_SUFFIXES
  32         lib64 lib
  33   HINTS
  34     "${CARES_LIBDIR}"
  35     "${CARES_HINTS}"
  36 )
  37
  38 # Try to retrieve version from header if found
  39 # Adapted from https://stackoverflow.com/a/47084079/82195
  40 if(CARES_INCLUDE_DIR)
  41   file(READ "${CARES_INCLUDE_DIR}/ares_version.h" _ares_version_h)
  42
  43   string(REGEX MATCH "#[\t ]*define[ \t]+ARES_VERSION_MAJOR[ \t]+([0-9]+)" _ ${_ares_version_h})
  44   set(_ares_version_major ${CMAKE_MATCH_1})
  45   string(REGEX MATCH "#[\t ]*define[ \t]+ARES_VERSION_MINOR[ \t]+([0-9]+)" _ ${_ares_version_h})
  46   set(_ares_version_minor ${CMAKE_MATCH_1})
  47   string(REGEX MATCH "#[\t ]*define[ \t]+ARES_VERSION_PATCH[ \t]+([0-9]+)" _ ${_ares_version_h})
  48   set(_ares_version_patch ${CMAKE_MATCH_1})
  49   set(CARES_VERSION ${_ares_version_major}.${_ares_version_minor}.${_ares_version_patch})
  50
  51   unset(_ares_version_h)
  52   unset(_ares_version_major)
  53   unset(_ares_version_minor)
  54   unset(_ares_version_patch)
  55 endif()
  56
  57 # handle the QUIETLY and REQUIRED arguments and set CARES_FOUND to TRUE if
  58 # all listed variables are TRUE
  59 INCLUDE(FindPackageHandleStandardArgs)
  60 FIND_PACKAGE_HANDLE_STANDARD_ARGS(CARES
  61     REQUIRED_VARS   CARES_LIBRARY CARES_INCLUDE_DIR
  62     VERSION_VAR     CARES_VERSION)
  63
  64 IF(CARES_FOUND)
  65   SET( CARES_LIBRARIES ${CARES_LIBRARY} )
  66   SET( CARES_INCLUDE_DIRS ${CARES_INCLUDE_DIR} )
  67   if (WIN32)
  68     set ( CARES_DLL_DIR "${CARES_HINTS}/bin"
  69       CACHE PATH "Path to C-Ares DLL"
  70     )
  71     file( GLOB _cares_dll RELATIVE "${CARES_DLL_DIR}"
  72       "${CARES_DLL_DIR}/cares.dll"
  73     )
  74     set ( CARES_DLL ${_cares_dll}
  75       CACHE FILEPATH "C-Ares DLL file name"
  76     )
  77     file( GLOB _cares_pdb RELATIVE "${CARES_DLL_DIR}"
  78       "${CARES_DLL_DIR}/cares.pdb"
  79     )
  80     set ( CARES_PDB ${_cares_pdb}
  81       CACHE FILEPATH "C-Ares PDB file name"
  82     )
  83     mark_as_advanced( CARES_DLL_DIR CARES_DLL CARES_PDB )
  84   endif()
  85 ELSE(CARES_FOUND)
  86   SET( CARES_LIBRARIES )
  87   SET( CARES_INCLUDE_DIRS )
  88   SET( CARES_DLL_DIR )
  89   SET( CARES_DLL )
  90 ENDIF(CARES_FOUND)
  91
  92 MARK_AS_ADVANCED( CARES_LIBRARIES CARES_INCLUDE_DIRS )