Difference between 'libicuio' and 'icuio' in the 'extra-libraries' field

I'm on Windows and I've recently updated my msys packages. One of them was libicu which I updated from version 58 to version 61. This caused one of my projects to stop building.

I've managed to reproduce the problem by just cloning the text-icu package and trying to open the repl in it. This is the error I get:

GHCi, version 8.2.2: http://www.haskell.org/ghc/  :? for help
ghc.EXE:  | C:\Users\darwi\Projects\text-icu\.stack-work\dist\5c8418a7\build\cbits\text_icu.o: unknown symbol `ucnv_getMaxCharSize_61'
linking extra libraries/objects failed

A similar error used to happen with icu 58, but I've "fixed" it (see this pull request https://github.com/bos/text-icu/pull/36). This time, however, adding icuio to extra-libraries doesn't cut it. But adding libicuio does the trick!

I'm opening a ticket here because I assume both of those should behave the same.

It's worth noting that if this is a bug, it's not just a GHCi issue. My other project that depends on text-icu just doesn't build (the same error happens during compilation).

Unfortunately I can't test on 8.4 right now.

Trac metadata

Trac field	Value
Version	8.2.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed milestone to %8.6.1

changed weight to 5

added GHCi Tbug Trac import labels

Would you be using Windows 10?

Indeed.

closed

This is a duplicate of #14456 (closed), you're hitting an issue where Microsoft has started shipping icuuc in Windows. GHCi is picking up this version but the version doesn't seem usable due to different symbol names.

It's been fixed in 8.4. using lib is explicitly forcing it to pick the import library, libicuio.dll.a which directs it to the right dll.

Under normal circumstances, those (libicuio vs icuio) two are *roughly* equivalent. There are some diffences but it should all work out to the same if you have your environment correct.

I'm closing it as a duplicate. I'm not sure the release manager would agree that this should be backported into the up and coming ghc 8.4.3 bug-fix release for ubuntu.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedDuplicate
Related	- → #14456 (closed)

Well, I'm stuck using my fork anyways since text-icu is not really maintained so adding an extra workaround isn't a problem. Thank you for the info!

lol, It's already been fix in 8.4, nothing to backport here. Sorry @bgamari, brainfart...

I think (not sure which version we've started doing it) but for sure 8.4 should be tracing dependencies automatically. So you shouldn't need that patch to text-icu with it.

added Pnormal label