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On Windows, we create multiple levels of wrappers for GHCi which ultimately
execute ghc --interactive. In order to handle console events properly, each of
these wrappers must call FreeConsole() in order to hand off event processing to
the child process. See #14150.
In addition to this, FreeConsole must only be called from interactive processes (#13411).
This commit makes two changes to fix this situation:
1. The hadrian wrappers generated using `hadrian/bindist/cwrappers/version-wrapper.c` call `FreeConsole`
if the CPP flag INTERACTIVE_PROCESS is set, which is set when we are generating a wrapper for GHCi.
2. The GHCi wrapper in `driver/ghci/` calls the `ghc-$VER.exe` executable which is not wrapped rather
than calling `ghc.exe` is is wrapped on windows (and usually non-interactive, so can't call `FreeConsole`:
Before:
ghci-$VER.exe calls ghci.exe which calls ghc.exe which calls ghc-$VER.exe
After:
ghci-$VER.exe calls ghci.exe which calls ghc-$VER.exe
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This patch allows ghc and its dependencies to be built using a normal
invocation of cabal-install. Each componenent which relied on generated
files or additional configuration now has a Setup.hs file.
There are also various fixes to the cabal files to satisfy
cabal-install.
There is a new hadrian command which will build a stage2 compiler and
then a stage3 compiler by using cabal.
```
./hadrian/build build-cabal
```
There is also a new CI job which tests running this command.
For the 9.4 release we will upload all the dependent executables to
hackage and then end users will be free to build GHC and GHC executables
via cabal.
There are still some unresolved questions about how to ensure soundness
when loading plugins into a reinstalled GHC (#20742) which will be
tighted up in due course.
Fixes #19896
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After commit 55ef3bdc28681a22ceccf207707c49229f9b7559, running `./configure`
now generates a `driver/ghci/ghci-wrapper.cabal` file from
`driver/ghci/ghci-wrapper.cabal.in`, which pollutes the `git` tree:
```
$ git status
On branch master
Your branch is up to date with 'origin/master'.
Untracked files:
(use "git add <file>..." to include in what will be committed)
driver/ghci/ghci-wrapper.cabal
nothing added to commit but untracked files present (use "git add" to track)
```
Since `driver/ghci/ghci-wrapper.cabal` is autogenerated, the sensible thing to
do is to add it to `.gitignore`. While I was in town, I also added the standard
`*.in` file disclaimer to `driver/ghci/ghci-wrapper.cabal.in`.
[ci skip]
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This wraps the existing GHCi wrapper script (driver/ghci/ghci.c) in a
cabal file and adds the package to Hadrian.
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