cmake/modules/PkgConfigEx.cmake

   1 # PkgConfigEx.cmake
   2 #
   3 # Extends CMake's PkgConfig module with commands:
   4 #
   5 # pkg_check_modules_for_option(_option_name _option_description _prefix _module0)
   6 #
   7 #    which calls `pkg_check_modules(_prefix _module0)` and if <_prefix>_FOUND is False,
   8 #    then prints an error with a hint to disaable the _option_name if needed.
   9 #
  10 # pkg_check_exists(_output_name _pkg)
  11 #
  12 #    calls pkg-config --exists for _pkg and stores the result to _output_name.
  13 #
  14 # pkg_check_at_least_version(_output_name _pkg _version)
  15 #
  16 #    calls pkg-config --at-least-version=_version for _pkg and stores the result to _output_name.
  17 #
  18 # pkg_check_exact_version(_output_name _pkg _version)
  19 #
  20 #    calls pkg-config --exact-version=_version for _pkg and stores the result to _output_name.
  21 #
  22 # pkg_check_variable(_output_name _pkg _name)
  23 #
  24 #    gets a variable named _name from package _pkg and stores the result into _output_name
  25
  26 find_package(PkgConfig REQUIRED)
  27
  28 macro(pkg_check_modules_for_option _option_name _option_description _prefix _module0)
  29         pkg_check_modules(${_prefix} ${_module0} ${ARGN})
  30
  31         if(NOT ${_prefix}_FOUND)
  32                 message(FATAL_ERROR "Necessary libraries not found or not enough version. If you want to disable ${_option_description}, please use -D${_option_name}=OFF argument to cmake command.")
  33         endif(NOT ${_prefix}_FOUND)
  34 endmacro()
  35
  36 macro(pkg_check_exists _output_name _pkg)
  37         execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --exists ${_pkg}
  38                         RESULT_VARIABLE ${_output_name})
  39
  40         # Negate the result, because 0 means 'found'
  41         if(${_output_name})
  42                 set(${_output_name} OFF)
  43         else(${_output_name})
  44                 set(${_output_name} ON)
  45         endif(${_output_name})
  46 endmacro()
  47
  48 macro(pkg_check_at_least_version _output_name _pkg _version)
  49         execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --atleast-version=${_version} ${_pkg}
  50                         RESULT_VARIABLE ${_output_name})
  51
  52         # Negate the result, because 0 means 'found'
  53         if(${_output_name})
  54                 set(${_output_name} OFF)
  55         else(${_output_name})
  56                 set(${_output_name} ON)
  57         endif(${_output_name})
  58 endmacro()
  59
  60 macro(pkg_check_exact_version _output_name _pkg _version)
  61         execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --exact-version=${_version} ${_pkg}
  62                         RESULT_VARIABLE ${_output_name})
  63
  64         # Negate the result, because 0 means 'found'
  65         if(${_output_name})
  66                 set(${_output_name} OFF)
  67         else(${_output_name})
  68                 set(${_output_name} ON)
  69         endif(${_output_name})
  70 endmacro()
  71
  72 function(pkg_check_variable _output_name _pkg _name)
  73     execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --variable=${_name} ${_pkg}
  74                     OUTPUT_VARIABLE _pkg_result
  75                     OUTPUT_STRIP_TRAILING_WHITESPACE)
  76
  77     set("${_output_name}" "${_pkg_result}" CACHE STRING "pkg-config variable ${_name} of ${_pkg}")
  78 endfunction()
  79
  80 macro(add_pkgconfig_file _input _output)
  81         configure_file(
  82                 ${CMAKE_CURRENT_SOURCE_DIR}/${_input}
  83                 ${CMAKE_CURRENT_BINARY_DIR}/${_output}
  84                 @ONLY
  85         )
  86
  87         install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${_output}
  88                 DESTINATION ${LIB_INSTALL_DIR}/pkgconfig
  89         )
  90 endmacro()