I encountered the following problem while loading a package, and ghci (version 6.2) told me to report it to this list.
Loading package fgl ... linking ...
/usr/local/lib/ghc-6.2/HSfgl.o: unknown symbol `_DataziTree_flatten_entry'
ghc-6.2: panic! (the `impossible' happened, GHC version 6.2):
can't load package `fgl'
Please report it as a compiler bug to glasgow-haskell-bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.
This happened after I removed "base" from the package_deps entry (see below).
Package {
name = "fgl",
auto = True,
import_dirs = ["$libdir/imports"],
source_dirs = [],
library_dirs = ["$libdir"],
hs_libraries = ["HSfgl"],
extra_libraries = [],
include_dirs = [],
c_includes = [],
package_deps = ["base"],
extra_ghc_opts = ["-fglasgow-exts"],
extra_cc_opts = [],
extra_ld_opts = [],
framework_dirs = [],
extra_frameworks = []
}When "base" is included, ghci start fine:
Loading package base ... linking ... done. Loading package fgl ... linking ... done. Prelude>
I can even access some values:
Prelude> Data.Graph.Inductive.version
FGL - Functional Graph Library, February 2005
However, when I try others, I get errors:
Prelude> Data.Graph.Inductive.Example.clr486
GHCi runtime linker: fatal error: I found a duplicate definition for symbol
_DataziGraphziInductiveziInternalziFiniteMap_Empty_closure
whilst processing object file
./Data/Graph/Inductive/Internal/FiniteMap.o
This could be caused by:
* Loading two different object files which export the same symbol
* Specifying the same object file twice on the GHCi command line
* An incorrect `package.conf' entry, causing some object to be
loaded twice.
GHCi cannot safely continue in this situation. Exiting now. Sorry.
I don't know what to do about this.
-- Martin
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