Currently, there are issues compiling assembly on PPC with clang, it does not like the particular set of symbols used within the PowerPC assembly CRC code. This means we need to compile any assembly source with GCC using the CCAS override to the configure script.

Unfortunately, when jumping between compilers like this, we see issues with compiling crc32.S as there is no default libtool --tag option provided for this file, which causes libtool to abort the compile.

We should find a way to provide this specific file with the needed tag.