Trying to build clamav on Solaris 11.3 with the Oracle C compiler, I got the following error:

libtool:   error: not configured to extract global symbols from dlpreopened files

I would have expected a build to use dlopen rather than the preopen fallback so looked for related configure tests that were perhaps returning the wrong answer.

The global_symbol_pipe being empty seemed a likely culprit.
the last three lines of nm -p on the conftest.o in this test are:

0000000032 T main
0000000016 T nm_test_func
0000000001 C nm_test_var

One Solaris 10, I'd get a D instead of a C. Adding C to the list of characters in the symcode variable and building again resulted in a successful build. I've attached a patch to add this C.