| 1 | The Simplified MakeMaker class hierarchy
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| 2 | ****************************************
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| 3 |
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| 4 | What most people need to know.
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| 5 |
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| 6 | (Subclasses on top.)
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| 7 |
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| 8 | MY
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| 9 | |
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| 10 | ExtUtils::MakeMaker
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| 11 | |
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| 12 | ExtUtils::MM_{Current OS}
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| 13 | |
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| 14 | ExtUtils::MM_Unix
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| 15 | |
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| 16 | ExtUtils::MM_Any
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| 17 |
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| 18 | The object actually used is of the class MY which allows you to
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| 19 | override bits of MakeMaker inside your Makefile.PL by declaring
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| 20 | MY::foo() methods.
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| 21 |
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| 22 |
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| 23 | The Real MakeMaker class hierarchy
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| 24 | **********************************
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| 25 |
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| 26 | You wish it was that simple.
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| 27 |
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| 28 | Here's how it really works.
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| 29 |
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| 30 | PACK### (created each call to ExtUtils::MakeMaker->new)
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| 31 | . |
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| 32 | (mixin) |
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| 33 | . |
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| 34 | MY (created by ExtUtils::MY) |
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| 35 | | |
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| 36 | ExtUtils::MY MM (created by ExtUtils::MM)
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| 37 | | |
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| 38 | ExtUtils::MM
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| 39 | | | |-----------------------
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| 40 | | | |
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| 41 | ExtUtils::Liblist ExtUtils::MakeMaker |
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| 42 | | |
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| 43 | ExtUtils::Liblist::Kid |
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| 44 | |
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| 45 | |
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| 46 | |
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| 47 | ExtUtils::MM_{Current OS} (if necessary)
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| 48 | |
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| 49 | ExtUtils::MM_Unix
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| 50 | |
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| 51 | ExtUtils::MM_Any
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| 52 |
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| 53 |
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| 54 | NOTE: Yes, this is a mess. See
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| 55 | http://archive.develooper.com/[email protected]/msg00134.html
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| 56 | for some history.
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| 57 |
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| 58 | NOTE: When ExtUtils::MM is loaded it chooses a superclass for MM from
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| 59 | amongst the ExtUtils::MM_* modules based on the current operating
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| 60 | system.
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| 61 |
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| 62 | NOTE: ExtUtils::MM_{Current OS} represents one of the ExtUtils::MM_*
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| 63 | modules except ExtUtils::MM_Any chosen based on your operating system.
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| 64 |
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| 65 | NOTE: The main object used by MakeMaker is a PACK### object, *not*
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| 66 | ExtUtils::MakeMaker. It is, effectively, a subclass of MY,
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| 67 | ExtUtils::Makemaker, ExtUtils::Liblist and ExtUtils::MM_{Current OS}
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| 68 |
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| 69 | NOTE: The methods in MY are simply copied into PACK### rather than
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| 70 | MY being a superclass of PACK###. I don't remember the rationale.
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| 71 |
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| 72 | NOTE: ExtUtils::Liblist should be removed from the inheritence hiearchy
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| 73 | and simply be called as functions.
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| 74 |
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| 75 | NOTE: Modules like File::Spec and Exporter have been omitted for clarity.
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| 76 |
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| 77 |
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| 78 | The MM_* hierarchy
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| 79 | ******************
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| 80 |
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| 81 | MM_Win95 MM_NW5
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| 82 | \ /
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| 83 | MM_BeOS MM_Cygwin MM_OS2 MM_VMS MM_Win32 MM_DOS MM_UWIN
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| 84 | \ | | | / / /
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| 85 | ------------------------------------------------
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| 86 | | |
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| 87 | MM_Unix |
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| 88 | | |
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| 89 | MM_Any
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| 90 |
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| 91 | NOTE: Each direct MM_Unix subclass is also an MM_Any subclass. This
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| 92 | is a temporary hack because MM_Unix overrides some MM_Any methods with
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| 93 | Unix specific code. It allows the non-Unix modules to see the
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| 94 | original MM_Any implementations.
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| 95 |
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| 96 | NOTE: Modules like File::Spec and Exporter have been omitted for clarity.
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