如何在Haskell中与GNU黄金链接器而不是ld链接 [英] How to link with the GNU gold linker instead of ld in Haskell

问题描述

我的Haskell项目花费了大量时间在链接dist / build / myapp / myapp ... ，并且在执行 TemplateHaskell时加载共享库 code。

我怀疑这是因为 ld 很慢。

如何通过切换至黄金连结器来改善连结时间？

解决方案

使用 gold链接3倍速度

由于GHC 7.8 ，你可以告诉GHC和cabal（在运行时无需重新编译GHC）链接使用GNU gold。

您需要在 .cabal 文件中：

 库：
 ghc -options：-optl-fuse-ld = gold 
 ld-options：-fuse-ld = gold 
 
可执行文件myExecutable 
 ghc-options：-optl-fuse-ld = gold 
 ld-options：-fuse-ld = gold 
  

（请注意，您可能希望将这些标志传递给 stack / cabal / Setup.hs 而不是硬编码.cabal文件，以减少软件包的可移植性。）

对我来说，它是 3.5x 更快，将项目的总链接时间从150秒缩短到40秒。

---

更新： code> lld

请参阅 https://github.com/nh2/link-with-lld-example 查看完整示例;关键部分：

 图书馆
 ghc-options：-pgmP铿锵声-pgmc铿锵声-pgma铿锵声-pgml clang-optl-fuse-ld = lld
 ld-options：-fuse-ld = lld 
 
可执行文件myExecutable 
 ghc-options： - pgmP clang-pgmc clang-pgma clang-pgml clang
 ld-options：-fuse-ld = lld 
  

比较我的项目的最终可执行链接时间的链接时间：

  ld 124秒
金36秒
 lld 11秒
  

My Haskell project spends lots of time in Linking dist/build/myapp/myapp ... and also in loading shared libraries when executing TemplateHaskell code.

I suspect this is because ld is slow.

How can I improve link times by switching to the gold linker?

解决方案

Link 3x faster with gold

Since GHC 7.8, you can tell GHC and cabal (at run time without having to recompile GHC) to link with GNU gold.

You need in your .cabal file:

library:
  ghc-options: -optl-fuse-ld=gold
  ld-options:  -fuse-ld=gold

executable myExecutable
  ghc-options: -optl-fuse-ld=gold
  ld-options:  -fuse-ld=gold

(Note you might want to pass these flags to stack/cabal/Setup.hs on the command line instead of hardcoding them in the .cabal file in order to not reduce the portability of the package.)

For me it's 3.5x faster, bringing down the total link time of a project from 150 seconds to 40 seconds.

---

Update: Link 10x faster with lld

See https://github.com/nh2/link-with-lld-example for a full example; key parts:

library
  ghc-options: "-pgmP clang" "-pgmc clang" "-pgma clang" "-pgml clang" "-optl-fuse-ld=lld"
  ld-options:  -fuse-ld=lld

executable myExecutable
  ghc-options: "-pgmP clang" "-pgmc clang" "-pgma clang" "-pgml clang"
  ld-options:  -fuse-ld=lld

Comparison of link time for the final executable link times my project:

ld   124 seconds
gold  36 seconds
lld   11 seconds

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