Hi,
On Windows, GHC embeds GMP (the C library) directly into the integer-gmp package. So you mustn't try to link against another libgmp library to avoid duplicated symbol errors (as the one you've got).
It may be that you have a dependency of this specific test (or
the test itself) that has the following stanza in its Cabal file:
"extra-libraries: gmp"
Regards,
Sylvain
Hi,
Suddenly started getting the following linker error after I moved code around in my project. It only seems to occur when I am building one specific cabal test target. When building a dependent build it build successfully but cabal repl test-xxx fails. I have no consistent way to repro but I will keep trying and file a defect..
GHCi, version 8.8.4: https://www.haskell.org/ghc/ :? for help
GHC runtime linker: fatal error: I found a duplicate definition for symbol
__gmpn_sec_sqr_itch
whilst processing object file
C:\Users\sumit\Apps\ghc-8.8.4\mingw\lib\libgmp.dll.a
The symbol was previously defined in
C:\Users\sumit\Apps\ghc-8.8.4\lib\integer-gmp-1.0.2.0\HSinteger-gmp-1.0.2.0.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.
ghc.exe: panic! (the 'impossible' happened)
(GHC version 8.8.4 for x86_64-unknown-mingw32):
loadArchive "C:\\Users\\sumit\\Apps\\ghc-8.8.4\\mingw\\lib\\libgmp.dll.a": failed
Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
CallStack (from HasCallStack):
die', called at .\\Distribution\\Client\\ProjectOrchestration.hs:1041:55 in main:Distribution.Client.ProjectOrchestration
cabal.exe: repl failed for mkr-txn-0.1.0.0-inplace-test-mkr-txn.
RegardsSumit
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