• Tamar Christina's avatar
    Add gen-dll as replacement for dll-split · 5f6a8204
    Tamar Christina authored
    Summary:
    This tool can be used to generate dll's for any list of object files
    given to it. It will then repartition them automatically to fit within
    a dll and generates as many dll's as needed to do this. Cyclic dependencies
    between these generated dlls are handle automatically so there is no need
    to tell it how to partition.
    
    It is also a lot more general than `dll-split` as it is able to split any
    package not just `libGHC`. It also uses a trick using GNU style import libraries
    to hide the splitting from the rest of the pipeline. Which means come linking time
    you don't need to know which dll contains what symbol or how many split dlls were
    created.
    
    The import libraries are by default created with libtool. However since libtool is BFD
    based it is very slow. So if present and detected by configure the `genlib` tool
    from the msys2 project is used. This makes a difference of about ~45 minutes when compiling.
    
    To install `genlib` run `pacman -Sy mingw-w64-$(uname -m)-tools-git`.
    
    More detailed explaination of the process can be found here
    https://ghc.haskell.org/trac/ghc/wiki/WindowsDynamicLinking
    
    Test Plan: ./validate
    
    Reviewers: austin, hvr, bgamari, erikd, simonmar
    
    Reviewed By: bgamari
    
    Subscribers: snowleopard, rwbarton, thomie, erikd, #ghc_windows_task_force
    
    GHC Trac Issues: #5987
    
    Differential Revision: https://phabricator.haskell.org/D3883
    5f6a8204
ghc.mk 57.9 KB