#4855: Debug.Trace.trace mangles Unicode strings
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Reporter: andersk | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.4.1
Component: libraries/base | Version: 7.0.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Incorrect result at runtime
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Comment(by batterseapower):
This happens because GHC call the C function debugBelch to output a
"trace" string. This has the advantage that the user of GHC can override
how "trace" messages are handled by changing the debugMsgFn function
pointer.
If we were to simply delete the GHC-specific #ifdef in Debug.Trace we
would be using "hPtStrLn stderr" instead, so the correct locale encoding
would be applied and trace would handle unicode properly.
Another option is to fix #5061, at which point we can make Trace work
properly by using withCString instead of withCAString.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4855#comment:3>
GHC <http://www.haskell.org/ghc/>
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