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Today's Topics:
1. Error Message: Can not find C library. How can I do this?
(S. H. Aegis)
----------------------------------------------------------------------
Message: 1
Date: Tue, 26 Feb 2019 15:47:59 +0900
From: "S. H. Aegis" <shae...@gmail.com>
To: beginners@haskell.org
Subject: [Haskell-beginners] Error Message: Can not find C library.
How can I do this?
Message-ID:
<CAJp-Nqw2Gboja9wVqRebA_pOMdak6bGQA7jKm3=kshyxodf...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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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