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As described in [`hadrian/doc/user-settings.md`](https://gitlab.haskell.org/ghc/ghc/blob/master/hadrian/doc/user-settings.md) the configuration of the build can be modified via `_build/hadrian.settings`. Here are a few useful snippets to accomplish common tasks:
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### Enabling DWARF debug symbols
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Most of these are now available as **flavour transformers** but still listed here as examples.
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### Enabling DWARF debug symbols (`+debug_info`)
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```
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stage1.*.ghc.hs.opts += -g3
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stage1.rts.ghc.c.opts += -optc-ggdb
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```
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### Building a ticky-enabled stage2 compiler
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### Building a ticky-enabled stage2 compiler (`+ticky_ghc)`
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Here we also dump STG syntax since this is necessary to interpret the profile:
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```
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stage1.ghc-bin.ghc.link.opts += -ticky
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```
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### Building an eventlog-enabled stage2 compiler
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```
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stage1.ghc-bin.ghc.link.opts += -eventlog
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```
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## Shell aliases
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Typing `hadrian/build -j8` is a pain to remember and to write, even when you can scroll your command history. Therefore I found it useful to define a bunch of shell aliases. Here's an excerpt from my home-manager config:
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