0

I am trying to use MinGW to compile Linux project into Windows. I have been successful doing so with Cygwin, but I would match rather prefer to use MinGW so I the program does not end up having dozens of unnecessary dependencies.

Unfortunately, I have run into a problem that the compiler complains of unidentified references to the file. I am using a precompiled version of FFTW3 for Windows and using dlltool to create .a files to link it to MinGW. I have specified the libpath for the compiler, but unfortunately, I am still encountering errors.

Here is my output: 

make all gcc -I../Include -L..\Lib -Wall -O3 -o lvdoenc lvdoenc.o lvdomain.o -I../Include -L..\Lib -m32 lvdoenc.o:lvdoenc.c:(.text+0x29b): undefined reference to _imp__fftw_execute' lvdoenc.o:lvdoenc.c:(.text+0x608): undefined reference to_imp__fftw_malloc' lvdoenc.o:lvdoenc.c:(.text+0x647): undefined reference to _imp__fftw_plan_r2r_2d' lvdoenc.o:lvdoenc.c:(.text+0x8d1): undefined reference to_imp__fftw_free' lvdoenc.o:lvdoenc.c:(.text+0x8e5): undefined reference to _imp__fftw_destroy_plan' c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: lvdoenc.o: bad reloc address 0x20 in section.eh_frame' c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: final link failed: Invalid operation collect2.exe: error: ld returned 1 exit status make: *** [lvdoenc] Error 1
 
13:23:28 Build Finished (took 217ms)

All the solutions I have come across involve compiling using gcc to link fftw3 (-lfftw3), but this does not work in MinGW. I am having the same problem in the Cygwin, but that solution of using -lfftw3 as a compiler option does work. I have even specified the location of the lib path. The include path works just fine, but it can't find the library in the libpath.

Any help would be great appreciated.

Improve this question
6
  • 1
    -lfftw3 must be given, without it the linker can't resolve the symbols from this library. You should add what's not working when you compile with -lfftw3. I just downloaded the dlls, used dlltool and tried to link a symbol of the fftw3-library with MinGW and it worked. Commented Jun 1, 2015 at 18:13
  • Does MinGW's gcc or linker know how to handle Windows style paths? Cause that's what your feeding to it (..**\**Lib). Also you're passing the include and lib paths twice. Commented Jun 1, 2015 at 18:20
  • Okay, so I used the Windows compiled binaries and just got it to recognize it by changing it to -lfftw3-3, it still is not linking properly. I think it can handle Windows style path because the include path is written the same way and it works just fine. @4566976 Really? where did you get the dlls from? I tried their website and the libraries would not link. I am using Eclipse as my IDE btw. Interestingly enough, some of the symbols do actually link properly, but others are not. Commented Jun 1, 2015 at 18:24
  • @4566976 I just learned some of the distributions of the libs are actually missing certain symbols. Where did you downlaod those Dlls from? Commented Jun 1, 2015 at 18:28
  • @Skylion: I downloaded them from here. dlltool -d libfftw3-3.def -l libfftw3.a int main() { fftw_malloc(); } gcc x.c -L.\. -lfftw3 Commented Jun 1, 2015 at 18:29

1 Answer 1

Reset to default
2

I downloaded the DLLs from here.

Then I've done the following (see http://www.mingw.org/wiki/createimportlibraries):

dlltool -d libfftw3-3.def -l libfftw3.a

/* x.c */ int main() { fftw_malloc(); }

gcc x.c -L.\. -lfftw3

Improve this answer
Sign up to request clarification or add additional context in comments.

1 Comment

Hi, I have tried the method above. Still I am getting the following error C:\GNUstep\bin/ld.exe: cannot find -lfftw3 collect2: ld returned 1 exit status

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.