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GHC 8.0.2: use -split-sections

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-split-sections replaced -split-objs with following upsides:

1) -split-objs adds considerable overhead to compile time

2) combined with stripping, it causes issues when cross-compiling

For upstream see https://ghc.haskell.org/trac/ghc/ticket/8405

This is supported only for Linux/Windows using ld linker.

GHC master also turns on -split-sections by default.

Example using stack:

Without splitting

  $ du /nix/store/5paayhibayr73zqfaj458g4k4mv108jn-stack-1.3.2
  4       /nix/store/5paayhibayr73zqfaj458g4k4mv108jn-stack-1.3.2/share/bash-completion/completions
  4       /nix/store/5paayhibayr73zqfaj458g4k4mv108jn-stack-1.3.2/share/bash-completion
  4       /nix/store/5paayhibayr73zqfaj458g4k4mv108jn-stack-1.3.2/share
  23416   /nix/store/5paayhibayr73zqfaj458g4k4mv108jn-stack-1.3.2/bin
  23420   /nix/store/5paayhibayr73zqfaj458g4k4mv108jn-stack-1.3.2

With -split-objs

  $ du /nix/store/fypymm529adpx71gdzm0851xz42wdbz0-stack-1.3.2
  20632   /nix/store/fypymm529adpx71gdzm0851xz42wdbz0-stack-1.3.2/bin
  4 /nix/store/fypymm529adpx71gdzm0851xz42wdbz0-stack-1.3.2/share/bash-completion/completions
  4 /nix/store/fypymm529adpx71gdzm0851xz42wdbz0-stack-1.3.2/share/bash-completion
  4       /nix/store/fypymm529adpx71gdzm0851xz42wdbz0-stack-1.3.2/share
  20636   /nix/store/fypymm529adpx71gdzm0851xz42wdbz0-stack-1.3.2

With -split-sections

  $ du /nix/store/40l6krinx1zx41lr87c4m12hxj4ldf3x-stack-1.3.2
  4       /nix/store/40l6krinx1zx41lr87c4m12hxj4ldf3x-stack-1.3.2/share/bash-completion/completions
  4       /nix/store/40l6krinx1zx41lr87c4m12hxj4ldf3x-stack-1.3.2/share/bash-completion
  4       /nix/store/40l6krinx1zx41lr87c4m12hxj4ldf3x-stack-1.3.2/share
  20672   /nix/store/40l6krinx1zx41lr87c4m12hxj4ldf3x-stack-1.3.2/bin
  20676   /nix/store/40l6krinx1zx41lr87c4m12hxj4ldf3x-stack-1.3.2

Note: you currently need following overrides to build stack on 802:

   vector-algorithms = dontCheck super.vector-algorithms;
   path-io = doJailbreak super.path-io;
   stack = doJailbreak super.stack;

Note: Should also work on GHC 8.0.1, but I'm being careful here.
      We could backport later on.
This commit is contained in:
Domen Kožar
2017-02-07 14:21:54 +01:00
parent 83865b2c6c
commit f031f3105a
2 changed files with 9 additions and 4 deletions
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pkgs/development/haskell-modules/lib.nix
+2 -2
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@@ -50,8 +50,8 @@ rec {
enableSharedLibraries = drv: overrideCabal drv (drv: { enableSharedLibraries = true; });
disableSharedLibraries = drv: overrideCabal drv (drv: { enableSharedLibraries = false; });
enableSplitObjs = drv: overrideCabal drv (drv: { enableSplitObjs = true; });
disableSplitObjs = drv: overrideCabal drv (drv: { enableSplitObjs = false; });
enableDeadCodeElimination = drv: overrideCabal drv (drv: { enableDeadCodeElimination = true; });
disableDeadCodeElimination = drv: overrideCabal drv (drv: { enableDeadCodeElimination = false; });
enableStaticLibraries = drv: overrideCabal drv (drv: { enableStaticLibraries = true; });
disableStaticLibraries = drv: overrideCabal drv (drv: { enableStaticLibraries = false; });