#
#Perl script interpreter
#

if (WIN32)

#Perl is not expected to be present on WIN32.
#Build from sources and install where find_package(perl) will find it.
#We take care to use a Perl release that will build with as many versions of
#Visual Studio as possible.

#Ancient Visual Studio which will be used to build Perl by default
set (PERL_CCTYPE MSVC60)
#If the Visual Studio detected by CMake is more recent, use it
#Visual Studio 2003
if (MSVC_VERSION EQUAL 1310)
  set (PERL_CCTYPE MSVC70FREE)
  message (STATUS "Building Perl with Visual Studio 2003")
endif (MSVC_VERSION EQUAL 1310)
#Visual Studio 2005
if (MSVC_VERSION EQUAL 1400)
  set (PERL_CCTYPE MSVC80FREE)
  message (STATUS "Building Perl with Visual Studio 2005")
endif (MSVC_VERSION EQUAL 1400)
#Visual Studio 2008
if (MSVC_VERSION EQUAL 1500)
  set (PERL_CCTYPE MSVC90FREE)
  message (STATUS "Building Perl with Visual Studio 2008")
endif (MSVC_VERSION EQUAL 1500)
#Visual Studio 2010
if (MSVC_VERSION EQUAL 1600)
  set (PERL_CCTYPE MSVC100FREE)
  message (STATUS "Building Perl with Visual Studio 2010")
endif (MSVC_VERSION EQUAL 1600)
#Visual Studio 2012
if (MSVC_VERSION EQUAL 1700)
  set (PERL_CCTYPE MSVC110FREE)
  message (STATUS "Building Perl with Visual Studio 2012")
endif (MSVC_VERSION EQUAL 1700)
#Visual Studio 2013
if (MSVC_VERSION EQUAL 1800)
  set (PERL_CCTYPE MSVC120FREE)
  message (STATUS "Building Perl with Visual Studio 2013")
endif (MSVC_VERSION EQUAL 1800)
#Visual Studio 2015
if (MSVC_VERSION EQUAL 1900)
  set (PERL_CCTYPE MSVC140FREE)
  message (STATUS "Building Perl with Visual Studio 2015")
endif (MSVC_VERSION EQUAL 1900)

ExternalProject_Add (
  perl
  PREFIX ${CMAKE_INSTALL_PREFIX}
  BUILD_IN_SOURCE 1
  URL https://github.com/Perl/perl5/archive/v5.25.10.zip
  DOWNLOAD_NAME perl-5.25.10.zip
  URL_MD5 f4ed14617211db52cfcdacd978001d78
  CONFIGURE_COMMAND ""
  BUILD_COMMAND ${CMAKE_COMMAND} -E chdir win32 nmake INST_TOP=$<SHELL_PATH:<INSTALL_DIR>> CCTYPE=${PERL_CCTYPE} install
  INSTALL_COMMAND ""
)
endif (WIN32)

if (UNIX)
#Rely on manual installation via the package manager
#You can then invoke perl as /usr/bin/perl
#sudo apt-get install perl
ExternalProject_Add (
  perl
  PREFIX ${CMAKE_INSTALL_PREFIX}
  BUILD_IN_SOURCE 1
  DOWNLOAD_COMMAND ""
  UPDATE_COMMAND ""
  CONFIGURE_COMMAND ""
  BUILD_COMMAND /usr/bin/perl --version
  INSTALL_COMMAND ""
)
endif (UNIX)