cmake/modules/FindOCaml.cmake

   1 # CMake find_package() module for the OCaml language.
   2 # Assumes ocamlfind will be used for compilation.
   3 # http://ocaml.org/
   4 #
   5 # Example usage:
   6 #
   7 # find_package(OCaml)
   8 #
   9 # If successful, the following variables will be defined:
  10 # OCAMLFIND
  11 # OCAML_VERSION
  12 # OCAML_STDLIB_PATH
  13 # HAVE_OCAMLOPT
  14 #
  15 # Also provides find_ocamlfind_package() macro.
  16 #
  17 # Example usage:
  18 #
  19 # find_ocamlfind_package(ctypes)
  20 #
  21 # In any case, the following variables are defined:
  22 #
  23 # HAVE_OCAML_${pkg}
  24 #
  25 # If successful, the following variables will be defined:
  26 #
  27 # OCAML_${pkg}_VERSION
  28
  29 include( FindPackageHandleStandardArgs )
  30
  31 find_program(OCAMLFIND
  32              NAMES ocamlfind)
  33
  34 if( OCAMLFIND )
  35   execute_process(
  36     COMMAND ${OCAMLFIND} ocamlc -version
  37     OUTPUT_VARIABLE OCAML_VERSION
  38     OUTPUT_STRIP_TRAILING_WHITESPACE)
  39
  40   execute_process(
  41     COMMAND ${OCAMLFIND} ocamlc -where
  42     OUTPUT_VARIABLE OCAML_STDLIB_PATH
  43     OUTPUT_STRIP_TRAILING_WHITESPACE)
  44
  45   execute_process(
  46     COMMAND ${OCAMLFIND} ocamlc -version
  47     OUTPUT_QUIET
  48     RESULT_VARIABLE find_ocaml_result)
  49   if( find_ocaml_result EQUAL 0 )
  50     set(HAVE_OCAMLOPT TRUE)
  51   else()
  52     set(HAVE_OCAMLOPT FALSE)
  53   endif()
  54 endif()
  55
  56 find_package_handle_standard_args( OCaml DEFAULT_MSG
  57   OCAMLFIND
  58   OCAML_VERSION
  59   OCAML_STDLIB_PATH)
  60
  61 mark_as_advanced(
  62   OCAMLFIND)
  63
  64 function(find_ocamlfind_package pkg)
  65   CMAKE_PARSE_ARGUMENTS(ARG "OPTIONAL" "VERSION" "" ${ARGN})
  66
  67   execute_process(
  68     COMMAND "${OCAMLFIND}" "query" "${pkg}" "-format" "%v"
  69     RESULT_VARIABLE result
  70     OUTPUT_VARIABLE version
  71     ERROR_VARIABLE error
  72     OUTPUT_STRIP_TRAILING_WHITESPACE
  73     ERROR_STRIP_TRAILING_WHITESPACE)
  74
  75   if( NOT result EQUAL 0 AND NOT ARG_OPTIONAL )
  76     message(FATAL_ERROR ${error})
  77   endif()
  78
  79   if( result EQUAL 0 )
  80     set(found TRUE)
  81   else()
  82     set(found FALSE)
  83   endif()
  84
  85   if( found AND ARG_VERSION )
  86     if( version VERSION_LESS ARG_VERSION AND ARG_OPTIONAL )
  87       # If it's optional and the constraint is not satisfied, pretend
  88       # it wasn't found.
  89       set(found FALSE)
  90     elseif( version VERSION_LESS ARG_VERSION )
  91       message(FATAL_ERROR
  92               "ocamlfind package ${pkg} should have version ${ARG_VERSION} or newer")
  93     endif()
  94   endif()
  95
  96   string(TOUPPER ${pkg} pkg)
  97
  98   set(HAVE_OCAML_${pkg} ${found}
  99       PARENT_SCOPE)
 100
 101   set(OCAML_${pkg}_VERSION ${version}
 102       PARENT_SCOPE)
 103 endfunction()