[Haskell-beginners] Error Message: Can not find C library. How can I do this?
S. H. Aegis
shaegis at gmail.com
Sat Mar 2 02:37:12 UTC 2019
Thank you to your kind reply. =)
Unfortunately, I've got same error message.
Thank you again.
Best reguard
S. Chang.
2019년 3월 2일 (토) 오전 4:42, Edgar Klerks <edgar.klerks at gmail.com>님이 작성:
> You made a small typo:
>
> example_dll.cpp, example_dll.dll, example_dll.h, example_dll.o,
> example_exe.cpp, *libexample_dll.a*
>
> And in your code, you call it example_dll.a instead of libexample_dll.a:
>
>>
>> extra-libraries:
>> - example_dll.a
>>
>
> That should probably be:
>
> extra-libraries:
> - libexample_dll.a
>
>
> On Tue, Feb 26, 2019 at 7:48 AM S. H. Aegis <shaegis at gmail.com> wrote:
>
>> Hello.
>>
>> I’m new to stack & FFI.
>>
>> I created a dll file by http://www.mingw.org/wiki/sampleDLL
>>
>> And I put all files into dll folder. (Those files are example_dll.cpp,
>> example_dll.dll, example_dll.h, example_dll.o, example_exe.cpp,
>> libexample_dll.a) I test example_exe.exe file, and confirmed that works.
>>
>> (Windows7 Pro, stack 1.9.3)
>>
>> <package.yaml>
>>
>> executables:
>>
>> test2-exe:
>>
>> main: Main.hs
>>
>> source-dirs: app
>>
>> ghc-options:
>>
>> - -threaded
>>
>> - -rtsopts
>>
>> - -with-rtsopts=-N
>>
>> dependencies:
>>
>> - test2
>>
>> extra-libraries:
>>
>> - example_dll.a
>>
>> extra-lib-dirs:
>>
>> - dll
>>
>> <stack.yaml>
>>
>> # Extra directories used by stack for building
>>
>> extra-include-dirs:
>>
>> - dll
>>
>> extra-lib-dirs:
>>
>> - dll
>>
>> <Main.hs>
>>
>> {-# LANGUAGE ForeignFunctionInterface #-}
>>
>>
>>
>> module Main where
>>
>>
>>
>> -- import Lib
>>
>> import Foreign
>>
>>
>>
>> foreign import ccall "example_dll.h hello"
>>
>> c_hello :: IO()
>>
>>
>>
>> main :: IO ()
>>
>> main = c_hello
>>
>> <example_dll.cpp>
>>
>> #include <stdio.h>
>>
>> #include "example_dll.h"
>>
>>
>>
>> __stdcall void hello(const char *s)
>>
>> {
>>
>> printf("Hello %s\n", s);
>>
>> }
>>
>> int Double(int x)
>>
>> {
>>
>> return 2 * x;
>>
>> }
>>
>> void CppFunc(void)
>>
>> {
>>
>> puts("CppFunc");
>>
>> }
>>
>> void MyClass::func(void)
>>
>> {
>>
>> puts("MyClass.func()");
>>
>> }
>>
>>
>>
>> When I try to stack build, I get error messages.
>>
>>
>>
>> *C:\Users\shaegis\Documents\Haskell\test2\dll>stack build*
>>
>> *Building all executables for `test2' once. After a successful build of
>> all of them, only specified executables will be rebuilt.*
>>
>> *test2-0.1.0.0: configure (lib + exe)*
>>
>> *Configuring test2-0.1.0.0...*
>>
>> *Cabal-simple_Z6RU0evB_2.4.0.1_ghc-8.6.3.exe: Missing dependency on a
>> foreign*
>>
>> *library:*
>>
>> ** Missing (or bad) C library: example_dll.a*
>>
>> *This problem can usually be solved by installing the system package that*
>>
>> *provides this library (you may need the "-dev" version). If the library
>> is*
>>
>> *already installed but in a non-standard location then you can use the
>> flags*
>>
>> *--extra-include-dirs= and --extra-lib-dirs= to specify where it is.If
>> the*
>>
>> *library file does exist, it may contain errors that are caught by the C*
>>
>> *compiler at the preprocessing stage. In this case you can re-run
>> configure*
>>
>> *with the verbosity flag -v3 to see the error messages.*
>>
>>
>>
>> *-- While building package test2-0.1.0.0 using:*
>>
>> *
>> C:\sr\setup-exe-cache\x86_64-windows\Cabal-simple_Z6RU0evB_2.4.0.1_ghc-8.6.3.exe
>> --builddir=.stack-work\dist\e626a42b configure
>> --with-ghc=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.3\bin\ghc.EXE
>> --with-ghc-pkg=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.3\bin\ghc-pkg.EXE
>> --user --package-db=clear --package-db=global
>> --package-db=C:\sr\snapshots\3233b5e2\pkgdb
>> --package-db=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\pkgdb
>> --libdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\lib
>> --bindir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\bin
>> --datadir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\share
>> --libexecdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\libexec
>> --sysconfdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\etc
>> --docdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\doc\test2-0.1.0.0
>> --htmldir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\doc\test2-0.1.0.0
>> --haddockdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\doc\test2-0.1.0.0
>> --dependency=base=base-4.12.0.0
>> --extra-include-dirs=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\include
>> --extra-include-dirs=C:\Users\shaegis\Documents\Haskell\test2\dll
>> --extra-lib-dirs=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\bin
>> --extra-lib-dirs=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\lib
>> --extra-lib-dirs=C:\Users\shaegis\Documents\Haskell\test2\dll
>> --enable-tests --enable-benchmarks*
>>
>> *Process exited with code: ExitFailure 1*
>>
>>
>>
>> How can I fix this? I did a lot of things on the webpages, but I could
>> not.
>>
>> Please, help me.
>>
>>
>>
>> Sincerely, S. Chang.
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>>
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--
Sok Ha, CHANG
Dr. Chang's Clinic. #203. 503-23. AmSa-Dong, GangDong-Gu, Seoul.
Tel: +82-2-442-7585
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