id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
1978	Error message: Undefined reference to `XXX_closure'	Andriy		"When I try to compile the following test case:
{{{
import System.IO
import Text.XML.HXT.Arrow

main = do
 runX $ application

application =
 readDocument [(a_validate, v_0)] ""url""
   >>> generateItemsXml
   -- >>. takeLast
   >>. \t -> [last t]
   >>> getErrStatus
 where
   takeLast xs = [last xs]

generateItemsXml = root [] []
}}}
the compilation fails because of the line "">>. \t -> [last t]"". If I extract this line into a separate function (here takeLast) or take it into parentheses, the compilation proceeds.
For this test case compilation actually fails later with more sensible error message, but the original full program compiles after this fix successfully. I can provide the full program if necessary. It is not very big. Contact me at c at hlsoft com.

The GHC compilation failure is:

{{{
~/prj/pubStats$ ./run.sh
[123 of 123] Compiling Main             ( src/testGhc.hs, src/testGhc.o )
Linking src/testGhc ...
src/testGhc.o: In function `Main_lvl3_info':
ghc26321_0.hc:(.text+0x166): undefined reference to `Main_application_closure'
src/testGhc.o:(.rodata+0x10): undefined reference to `Main_application_closure'
collect2: ld returned 1 exit status
}}}

The GHCi fails with following message:

{{{
During interactive linking, GHCi couldn't find the following symbol:
 Main_application_closure
This may be due to you not asking GHCi to load extra object files,
archives or DLLs needed by your current session.  Restart GHCi, specifying
the missing library using the -L/path/to/object/dir and -lmissinglibname
flags, or simply by naming the relevant files on the GHCi command line.
Alternatively, this link failure might indicate a bug in GHCi.
If you suspect the latter, please send a bug report to:
 glasgow-haskell-bugs@haskell.org
}}}

The GHC version:
""The Glorious Glasgow Haskell Compilation System, version 6.6"" on Ubuntu Linux 7.04. Currently I don't have time to try to reproduce the problem on the latest version of the compiler.

I compile my program with the HXT library using the following command:

{{{
ghc --make -O -fglasgow-exts -farrows -iinc src/testGhc.hs
}}}

where the inc directory contains the HXT library.
Sorry if it is not a bug, or it is already fixed. I could not decide whether other occurrences of this error indicate the same problem. Decided that submitting an invalid bug is better than missing it completely."	bug	closed	normal		Compiler	6.6	invalid			Linux	x86		Unknown