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
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)
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
# Extra directories used by stack for building
extra-include-dirs:
- dll
extra-lib-dirs:
- dll
{-# LANGUAGE ForeignFunctionInterface #-}
module Main where
-- import Lib
import Foreign
foreign import ccall "example_dll.h hello"
c_hello :: IO()
main :: IO ()
main = c_hello
#include
#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. _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners