While playing with the Borg R-wrapper, I ran into difficulties loading the shared borg.dll library into R as a result of mingw compiling for a 32-bit system when I was using the 64 bit version of R. After running the following command from the Windows command line,
gcc -shared -O3 -o borg.dll borg.c mt19937ar.c -lm
I compiled a .dll file that worked fine for the python wrapper because I have a 32 bit version of Python and the 32 bit version of the R GUI but resulted in error messages when I tried to optimize a problem using Borg in RStudio. I was able to resolve this issue by installing MinGW-w64 and selecting the x86_64 architecture option as shown in the following screenshot.
Then, I added the following to my Windows path:
and ran the following command. After this, everything ran smoothly with the Borg R wrapper.
x86_64-w64-mingw32-gcc -shared -O3 -o borg.dll borg.c mt19937ar.c -lm
I found the following site useful for appropriate commands to compile using MinGW-w64.