I try to compile and link a *.c file (to use with the jni) on linux to target windows 64bit with mingw-w64. I do
x86_64-w64-mingw32-gcc -I"path/to/headers" -shared -o output.dll input.c
Everything compiles and I get a 64bit *.dll as file output.dll shows:
output.dll: PE32+ executable (DLL) (console) x86-64, for MS Windows
But on my 64bit windows java throws an Unsatisfied link error because some libraries, my dll depends on, are missing. So I downloaded Dependency Walker and opened the dll file. It shows me that the *.dll file is linked with the 32bit (x86) versions of the dlls I depend on instead the 64 bit dlls. Only my dll is 64bit (x64). I looked into C:\Windows and found out that also the 64bit dlls are present.
So I tried to fix this by adjusting the arguments in the mingw command. In the manual-entry for ld I found option -L to specify a path dependencies. So I tried the following:
x86_64-w64-mingw32-gcc -Wl,-L"/usr/x86_64-w64-mingw32/lib/" -I"path/to/headers" -shared -o output.dll input.c
x86_64-w64-mingw32-gcc -Wl,-L"/usr/x86_64-w64-mingw32/lib/",-static -I"path/to/headers" -shared -o output.dll input.c
x86_64-w64-mingw32-gcc -Wl,-static -I"path/to/headers" -shared -o output.dll input.c
x86_64-w64-mingw32-gcc -m64 -I"path/to/headers" -shared -o output.dll input.c
Note: /usr/x86_64-w64-mingw32/lib/ is the directory where mingw's 64bit *.a files are located.
The above commands didn't seem to have any effect on my output dll. It stays 64 bit but linked to 32bit dlls. I have no idea what to do to get this work.
Also when I compile this for 32 bit using i686-w64-mingw32-gcc everything works fine and I get a 32bit dll linked with the 32bit dlls in windows.
My windows is windows 7 home premium and I use java 11 by the way.
EDIT: I know this question but the answer doesn't work for me.