[Haskell-cafe] external linking traumas
chris at chrisdornan.com
Mon Oct 20 20:50:33 EDT 2008
I am battling Database.HSQL to get it to work on GHC-6.8.3 running Cygwin/XP
and I seem to have found a worthy opponent.
I have got the following to work:
main :: IO ()
do c <- cnct
tbs <- tables c
putStr $ unlines $ "Tables:":[" "++tnm|tnm<-tbs]
cnct :: IO Connection
cnct = connect "host" "database" "user" "password"
To work on *ghci* that is, but I can't get it to work with *ghc*.
For ghci I use:
ghci test.hs -llibmySQL
with libmySQL.dll copied into the same directory.
If I try the same with ghc:
ghc test.hs -package hsql-1.7 -package hsql-mysql-1.7 -L.
with libmysql.lib copied into the same directory I get:
1.7.a(MySQL.o)(.text+0x748):fake: undefined reference to `mysql_init at 4'
1.7.a(MySQL.o)(.text+0x83f):fake: undefined reference to
`mysql_real_connect at 32'
1.7.a(MySQL.o)(.text+0x216c):fake: undefined reference to
`mysql_stmt_affected_rows at 4'
collect2: ld returned 1 exit status
If I try substituting -llibmySQL (to select the dll) I get the same results.
GHC is clearly not resolving the links between Database.HSQL.MySQL and the
native libmysql.lib/libmySQL.dll in the way that ghci does with the dll.
I must be doing something silly. If someone can tell me I would be
I would also like to know what I need to do to package this up inside CABAL;
all my attempts so far have failed.
It seems that there has been no maintainer for HSQL for some time, which is
a shame, as folks seem to be repeatedly cracking their heads against these
problems and re-solving them. I may be able to take on hsql and hsq-mysql
myself, but not the other backends. Perhaps it is the prospect of
maintaining them all may be stopping folks from stepping forward. (If it is
being maintained and I am just making a hash of it then please accept my
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