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IreneKnapp / direct-sqlite

MIT License
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Work around linker error when ghc is invoked by itself #25

Closed joeyadams closed 11 years ago

joeyadams commented 11 years ago

I was getting the following error on Ubuntu 13.04 when using "ghc -Wall -O2" to compile a program using direct-sqlite:

/usr/bin/ld: /home/joey/.cabal/lib/direct-sqlite-2.3.3.1/ghc-7.6.2/libHSdirect-sqlite-2.3.3.1.a(sqlite3.o): undefined reference to symbol 'pthread_mutexattr_settype@@GLIBC_2.1'
/usr/bin/ld: note: 'pthread_mutexattr_settype@@GLIBC_2.1' is defined in DSO /lib/i386-linux-gnu/libpthread.so.0 so try adding it to the linker command line
/lib/i386-linux-gnu/libpthread.so.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status

The error does not happen if I build direct-sqlite with -fsystemlib or compile my program with -threaded.

I think the problem is described here: UnderstandingDSOLinkChange. Simply put, sqlite3.c needs pthread, but we didn't have an extra-libraries line for it. We were just taking it for granted because GHC also needed it.

nurpax commented 11 years ago

Looks good to me.

IreneKnapp commented 11 years ago

Thanks to both of you. :)