id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
7096	linker fails to load package with binding to foreign library	nus		"GHCI is unable to load 'network' package on Windows. The versions:
{{{
$ ghci --version
The Glorious Glasgow Haskell Compilation System, version 7.4.2
}}}
{{{
$ ghc-pkg list network
c:/mnt/data1/ghc32b\lib\package.conf.d:
    network-2.3.0.14
}}}

The test code:
{{{
import Network

main = withSocketsDo $ do listenOn (PortNumber 3333) -- >>= accept
}}}

The failure:
{{{
> ghci winsock-load-failure.hs
GHCi, version 7.4.2: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
[1 of 1] Compiling Main             ( winsock-crash.hs, interpreted )
Ok, modules loaded: Main.
*Main> main
Loading package bytestring-0.9.2.1 ... linking ... done.
Loading package transformers-0.3.0.0 ... linking ... done.
Loading package mtl-2.1.2 ... linking ... done.
Loading package array-0.4.0.0 ... linking ... done.
Loading package deepseq-1.3.0.0 ... linking ... done.
Loading package text-0.11.2.2 ... linking ... done.
Loading package parsec-3.1.3 ... linking ... done.
Loading package network-2.3.0.14 ... linking ... <interactive>: C:\mnt\data1\ghc32b\network-2.3.0.14\ghc-7.4.2\HSnetwork-2.3.0.14.o: unknown symbol `__imp__WSACleanup'
ghc.exe: unable to load package `network-2.3.0.14'
}}}

The load trace log ('+RTS -Dl'):
{{{
[...snip...]
lookupSymbol: looking up __imp__WSACleanup@0
initLinker: start
initLinker: idempotent return
lookupSymbol: symbol not found
<interactive>: C:\mnt\data1\ghc32b\network-2.3.0.14\ghc-7.4.2\HSnetwork-2.3.0.14.o: unknown symbol `__imp__WSACleanup'
[...snip...]
}}}

The symbol to be resolved:
{{{
$ nm network-2.3.0.14/ghc-7.4.2/HSnetwork-2.3.0.14.o |grep WSACleanup
         U __imp__WSACleanup@0
}}}

The actual symbol in the foreign library:
{{{
$ objdump -p  /c/Windows/System32/ws2_32.dll
c:/Windows/System32/ws2_32.dll:     file format pei-i386
[...snip...]
[Ordinal/Name Pointer] Table
[...snip...]
        [ 115] WSACleanup
[...snip...]
}}}

The test snippet only works when compiled by ghc (so the resulting binary is produced by ld.bfd)."	bug	closed	normal		Runtime System	7.4.2	duplicate			Windows	x86	None/Unknown