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doc: DEVFAQ: building with ghc-debug support

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Simon Michael 2024-05-01 13:47:02 -10:00
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@ -51,3 +51,22 @@ It will install executables to `~/.cabal/bin`:
```cli
$ cabal install all:exes
```
### How do I build/run hledger with ghc-debug support ?
```cli
$ stack build --flag hledger:ghcdebug --flag hledger-ui:ghcdebug --flag hledger-web:ghcdebug
```
You can check it in the --version output, which should mention "ghc-debug":
```
$ stack exec -- hledger --version
```
With such a build, you can enable the ghc-debug listener by running hledger with a negative --debug level. Eg:
```cli
$ hledger ... --debug=-1 # run normally, while also listening for ghc-debug commands
$ hledger ... --debug=-2 # pause for ghc-debug commands at program start
$ hledger ... --debug=-3 # pause for ghc-debug commands at program end
```
Then you can pause/resume hledger's execution and inspect memory and profile information
with the interactive `ghc-debug-brick` client,
or extract specific information with a custom ghc-debug script.