Did I find a bug cabal? I have attempted to fix the problem Main.c:(.text+0x22): undefined reference to `__stginit_ZCMain' by compiling my Haskell library using the flag -no-hs-main. One would think that this would make sense if the library is to be used by an external C program. However I am using cabal to build the haskell library and I immediately run into a problem. My netsim.cabal file looks like Name: Netsim Version: 1.1 License: AllRightsReserved Exposed-modules: Matrix, Parsefile, PowCDF Build-Depends: base, regex-compat>=0.71, parsec>=2.0 Extensions: ForeignFunctionInterface Includes: matrixstack.h Install-includes: matrixstack.h, TunePerf.h Include-dirs: ../matrixstack, /usr/lib/ghc-6.6.1/include, . Extra-libraries: netsimc, matrixstack, lapack, ptcblas, atlas Extra-lib-dirs: /usr/local/atlas/lib, ., ./phymake,../matrixstack Ghc-options: -fglasgow-exts -O2 -no-hs-main My setup.hs file looks like: import Distribution.Simple main = defaultMainWithHooks defaultUserHooks When I build this using runhaskell Setup.hs build all the source files compile just fine, but then a screwy thing happens. Cabal attempts to build an executable called a.out. Moreover a.out has no main of course and it does not attempt to link to any of the libraries in the Extra-libraries field. This kills the cabal build. So trying to link a.out (which it shouldnt be doing) gives me the errors, Preprocessing library Netsim-1.1... Building Netsim-1.1... Linking a.out ... dist/build/Matrix.o: In function `Netsimzm1zi1_Matrix_zdwccall_info': ghc6835_0.hc:(.text+0x1ea9): undefined reference to `PmatC' dist/build/Matrix.o: In function `Netsimzm1zi1_Matrix_zdwccall1_info': ghc6835_0.hc:(.text+0x1f79): undefined reference to `Pmat' dist/build/Matrix.o: In function `Netsimzm1zi1_Matrix_zdwccall2_info': ... /usr/lib/ghc-6.6.1/libHSrts.a(Main.o): In function `main': Main.c:(.text+0x22): undefined reference to `__stginit_ZCMain' Main.c:(.text+0x43): undefined reference to `ZCMain_main_closure' If I eliminate the -no-hs-main flag in Ghc-options no attempt is made to creat a.out, which is as it should be and the library builds without complaint. This seems like a bug in cabal. -- View this message in context: http://www.nabble.com/GHC-linking-problems-tf4270650.html#a12206722 Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.