Migrating to the new LLVM and Clang compiler infrastructure

IBM® Open XL C/C++ for AIX® 17.1.0 incorporates the LLVM and Clang compiler infrastructure.

When you migrate programs from IBM XL C/C++ for AIX 16.1.0 or earlier releases to IBM Open XL C/C++ for AIX 17.1.0, consider factors including changed compiler options, built-in functions, and environment variables.