Sudden exit in GHCi for FFI code - works when run as executable
Summary
I am integrating a C++ library into a project for musical live coding - so GHCi is always used.
My integration works when the project is run as an executable via cabal v2-run
but not when run via cabal v2-repl
.
GHCi exists with exit code 541541187 which corresponds to 0x20474343, which seems to be a fairly common, but unspecific, error code.
Steps to reproduce
The code to reproduce exists here: https://github.com/Zalastax/Tidal/tree/tidal-link/tidal-link ( https://github.com/Zalastax/Tidal/commit/1e5bc9f121abfd2d3c47cb778778b9f7b1dbda9a ). Check out the linked commit, run git submodule update --init --recursive
. Go to the tidal-link
directory. Run cabal v2-run
and observe that it cleanly exits after pressing enter 6 times (there are a few getLine
).
$ cabal v2-run
Up to date
"hello"
"Created link"
"gotline"
"Link enabled"
"gotline"
"Created sessionState"
"gotline"
"Now: 690261494419"
"gotline"
"gotline"
"beat: 20.418723"
"gotline"
"Now': 690266558073"
"beat': 27.845418"
Follow up by running cabal v2-repl
, call hello
(which is IO ()
), press enter twice, notice that it crashes.
$ cabal v2-repl
Resolving dependencies...
Build profile: -w ghc-9.2.1 -O1
In order, the following will be built (use -v for more details):
- tidal-link-0.0.1 (lib) (configuration changed)
Configuring library for tidal-link-0.0.1..
Preprocessing library for tidal-link-0.0.1..
GHCi, version 9.2.1: https://www.haskell.org/ghc/ :? for help
[1 of 1] Compiling Sound.Tidal.Link ( C:\\Users\ekrapie\programming\Tidal\dist-newstyle\build\x86_64-windows\ghc-9.2.1\tidal-link-0.0.1\build\Sound\Tidal\Link.hs, interpreted )
Ok, one module loaded.
ghci> hello
"hello"
"Created link"
"gotline"
"Now: 692484810696"
"gotline"
"Link enabled"
cabal.exe: repl failed for tidal-link-0.0.1. The build process terminated with
exit code 541541187
If I instead build a .dll and make my FFI calls towards that .dll, the code does not crash in GHCi. See follow-up commit https://github.com/Zalastax/Tidal/commit/6d3c67124d9f0ac1e183288ceaa954d9b0bc6df6.
Expected behavior
I expect that the program should work both when run as executable and in GHCi.
Environment
- GHC version used:
GHC 9.0.1
or
GHC 9.2.1
Optional:
- Operating System: Windows 10
- System Architecture: X64