Accessing main program global variables from a dlopen()ed dynamic library in C on OS X

Question

I am maintaining a small application that has some plugin-like functionality, which is implemented through runtime-loaded dynamic modules.

Specifically, since it\'s

Answer 1

Put the global in main.c and declare it extern in the shared object, and try this:

MACOSX_DEPLOYMENT_TARGET=10.3 ld -dylib -undefined dynamic_lookup -o multiply.so multiply.o

or

MACOSX_DEPLOYMENT_TARGET=10.3 libtool -dynamic -undefined dynamic_lookup -o multiply.so multiply.o

It worked for me on Mac OS X 10.4