#
#getopt()
#
#Part of libc on Linux, but implemented here on WIN32.
#The following implements getopt() in a WIN32 static library.
#Use as follows:
#
#include<getopt.h> (as usual)
#
#In the cmake script:
#
#find_package (getopt CONFIG)
#if (TARGET getopt)
#target_link_libraries (xxx getopt)
#endif
#

if (WIN32)
ExternalProject_Add (
  getopt
  PREFIX ${CMAKE_INSTALL_PREFIX}
  URL https://github.com/alex85k/wingetopt/archive/v0.95.zip
  URL_MD5 ed2009498f0902c146e814b2eb91479c
  PATCH_COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/patch .  
  CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
)
else ()
#getopt() is available on any *NIX operating system by default.
#Implement a dummy getopt external project so that the OSD getopt module is
#valid on *NIX, too. The effect of using it is different, though.
#No getopt library will be available, instead it is in the standard library.
ExternalProject_Add (
  getopt
  PREFIX ${CMAKE_INSTALL_PREFIX}
  BUILD_IN_SOURCE 1
  DOWNLOAD_COMMAND ""
  UPDATE_COMMAND ""
  CONFIGURE_COMMAND ""
  BUILD_COMMAND ""
  INSTALL_COMMAND ""
)
endif (WIN32)