Using different compilers for either production or testing purposes can be challenging. While the GNU Compiler Collection is the standard on GNU/Linux system, using more than one compiler toolchain helps to identify bugs in the code. The project I am working on uses the Clang compiler. I added command-line options for NVIDIA’s nvc and nvc++ from the high-performance compiler collection. The first compilations runs yielded the error message “undefined reference to `Mcuda_compiled'” during the linker phase. Inspecting the object files and the libraries did not help. Several libraries define the Mcuda_compiled symbol. The key is to use consistent -M options across compiler and linker. The compiler uses the optimizer flags -Mcuda -Mvect. Adding the same options to the linker phase solves the problem. Inspecting the output of ldd shows that the library libcudanvhpc.so contains the symbol.
