如何在 cabal-dev 安装中启用分析？

Question

我正在尝试分析一个具有一些依赖项的程序 Windingnumber。根据 Aleksander Dmitrov 在Profile Haskell without installing installing profiling libraries for all dependencies 中的回答，我正在使用 cabal-dev 来（尝试）构建所有启用了分析的依赖项。我试过了

• cabal-dev install --config=./cabal-dev.config，其中 cabal-dev.config 是

  library-profiling: True
  executable-profiling: True
  package-db: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/packages-7.6.1.conf
  local-repo: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/packages
  user-install: False
  remote-repo: hackage.haskell.org:http://hackage.haskell.org/packages/archive
  remote-repo-cache: /home/christopher/.cabal/packages
  optimization: True
  build-summary: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/logs/build.log
  remote-build-reporting: anonymous
  optimization: True
  
  install-dirs user
    prefix: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/
  install-dirs global
  

• cabal-dev install --cabal-install-arg='--enable-library-profiling' --cabal-install-arg='--enable-executable-profiling'

（当然，要从原始环境开始，在两者之间加上rm -rf cabal-dev。）在每种情况下，我都得到：

arch% cabal-dev/bin/windingnumber +RTS -p
cabal-dev/bin/windingnumber +RTS -p
windingnumber: the flag -p requires the program to be built with -prof
windingnumber: 
windingnumber: Usage: <prog> <args> [+RTS <rtsopts> | -RTS <args>] ... --RTS <args>
<snip>

---即未启用分析。如何启用它？

ETA 解决方案： 将-prof 添加到项目的 .cabal 文件中的 ghc-options 中。显然在 cabal-dev 配置中设置 `executable-profiling: True" 并没有这样做。感谢 Daniel Fischer。

Answer 1

看起来cabal-dev 每次运行都会重写./cabal-dev/cabal.config。但是，您可以编辑 ~/.cabal/share/cabal-dev-$VERSION/admin/cabal-config.in 来设置默认值：

$  vim ~/.cabal/share/cabal-dev-0.9.1/admin/cabal-config.in
# Set executable-profiling and library-profiling to True
$ cabal unpack ghc-core
$ cd ghc-core-0.5.6
$ cabal-dev install --dependencies-only
$ cabal-dev configure -p
$ cabal-dev build
$ ./dist/build/ghc-core/ghc-core +RTS -p
# much success

如果您不想为使用cabal-dev 管理的所有项目启用分析，请使用--extra-config-file 选项（--config 只是设置自动生成的配置文件的位置）：

$ cat cabal-dev.config 
executable-profiling: True
library-profiling: True
$ cabal-dev --extra-config-file='./cabal-dev.config' install
$ ./cabal-dev/bin/ghc-core +RTS -p
# success

不建议使用 .cabal 文件中的 ghc-options 字段来启用分析 - 您不希望从 Hackage 安装您的软件包的每个人都使用分析进行构建。使用 cabal-dev configure -p --ghc-options="-fprof-auto" 仅对当前构建启用分析。