• olsner's avatar
    Implement function-sections for Haskell code, #8405 · 4a32bf92
    olsner authored
    This adds a flag -split-sections that does similar things to
    -split-objs, but using sections in single object files instead of
    relying on the Satanic Splitter and other abominations. This is very
    similar to the GCC flags -ffunction-sections and -fdata-sections.
    
    The --gc-sections linker flag, which allows unused sections to actually
    be removed, is added to all link commands (if the linker supports it) so
    that space savings from having base compiled with sections can be
    realized.
    
    Supported both in LLVM and the native code-gen, in theory for all
    architectures, but really tested on x86 only.
    
    In the GHC build, a new SplitSections variable enables -split-sections
    for relevant parts of the build.
    
    Test Plan: validate with both settings of SplitSections
    
    Reviewers: dterei, Phyx, austin, simonmar, thomie, bgamari
    
    Reviewed By: simonmar, thomie, bgamari
    
    Subscribers: hsyl20, erikd, kgardas, thomie
    
    Differential Revision: https://phabricator.haskell.org/D1242
    
    GHC Trac Issues: #8405
    4a32bf92
HscMain.hs 73 KB