On Fri, 2005-04-08 at 11:01 -0400, haitao.wu@yale.edu wrote:
Hi,
I developed a program based on wxHaskell but it has serious performance problem. So I tried to compile the program using "-prof" in GHC.
If I use "ghc --make -fglasgow-exts -package wx -prof Main.lhs", it always reports that it cannot find modules defined in wxHaskell like WXCore. However, if I compile it without the "-prof" option, it works well and can generate "a.out".
Anyone can give any help?
The problem is that wxHaskell does not come with profiling versions of its libraries. You see, for GHC's profiling everything needs to be compiled with profiling support. This is because the profiling and non-profiling styles are not compatible, for example the profiling version adds extra hidden arguments to functions and various other things to actualy do the profiling. So for example the libraries that come with GHC itself have to copies, the profiling and non-porofiling verions. For many other libraries this is unfortunately not the case since the build infrastructure to produce two copies of everything is not so trivial to do (I think). You can probably rebuild wxHaskell with profiling support (though it may not be so trivial since the it changes the names of various files by adding _p extensions here and there so the build system may not like it). Ask about it on the wxHaskell list: wxhaskell-users@lists.sourceforge.net This leads onto a cabal feature request. Can we have a parameter to build profiling versions of libraries in addition to the normal version? Duncan