# - pkg-config module for CMake
#
# Defines the following macros:
#
# PKGCONFIG(package includedir libdir linkflags cflags)
#
# Calling PKGCONFIG will fill the desired information into the 4 given arguments,
# e.g. PKGCONFIG(libart-2.0 LIBART_INCLUDE_DIR LIBART_LINK_DIR LIBART_LINK_FLAGS LIBART_CFLAGS)
# if pkg-config was NOT found or the specified software package doesn't exist, the
# variable will be empty when the function returns, otherwise they will contain the respective information
#



FIND_PROGRAM(PKGCONFIG_EXECUTABLE NAMES pkg-config PATHS /usr/local/bin )

MACRO(PKGCONFIG _package _include_DIR _link_DIR _link_FLAGS _cflags)
# reset the variables at the beginning
  SET(${_include_DIR})
  SET(${_link_DIR})
  SET(${_link_FLAGS})
  SET(${_cflags})
  IF(MSVC)
    SET(_msvc_mode --msvc-syntax)
  ELSE(MSVC)
    SET(_msvc_mode)
  ENDIF(MSVC)
  # if pkg-config has been found
  IF(PKGCONFIG_EXECUTABLE)

    EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --exists RETURN_VALUE _return_VALUE OUTPUT_VARIABLE _pkgconfigDevNull )

    # and if the package of interest also exists for pkg-config, then get the information
    IF(NOT _return_VALUE)

      EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --variable=includedir OUTPUT_VARIABLE __include_DIR)
      STRING(REPLACE "\n" "" ${_include_DIR} ${__include_DIR})

      EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --variable=libdir OUTPUT_VARIABLE __link_DIR)
      STRING(REPLACE "\n" "" ${_link_DIR} ${__link_DIR})

      EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --libs OUTPUT_VARIABLE __link_FLAGS)
      STRING(REPLACE "\n" "" ${_link_FLAGS} ${__link_FLAGS})

      EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --cflags OUTPUT_VARIABLE __cflags)
      STRING(REPLACE "\n" "" ${_cflags} ${__cflags})

    ENDIF(NOT _return_VALUE)

  ENDIF(PKGCONFIG_EXECUTABLE)

ENDMACRO(PKGCONFIG _include_DIR _link_DIR _link_FLAGS _cflags)

MARK_AS_ADVANCED(PKGCONFIG_EXECUTABLE)
