Cannot link against new API function

Question

I'm trying to add a new function to libsoup. I've gotten libsoup itself to compile correctly with my new function in it; I've also added the function prototype to the relevant header file. However, when trying to compile a test program against the local so, the linker complains that the reference to my new function is undefined. Checking with objdump -T, I can see that the function is there in the library, but not when checking with nm -C -D. Even if I globalize the symbol using objcopy, nm still can't see it.

I've also already tried adding __attribute__((visibility("default"))), but it doesn't seem to help.

I use this compiler invocation for my test program:

gcc -o test -I. -I $prefix/include/glib-2.0/ -I $prefix/lib/glib-2.0/include/ -L libsoup/.libs/ test.c -lsoup-2.4

Answer 1

It turned out that there is a libsoup/libsoup-2.4.sym file listing all the exported symbols in the repository. After adding my new function name to that file, I had to rm libsoup/libsoup-2.4.la and run make again, which resulted in my new function being available for use in my test program.