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Mercury with Clang

This file documents how to use clang as the C compiler with Mercury. Support for Mercury with clang has been tested on Linux, macOS and Windows.

To use clang as the C compiler for Mercury invoke Mercury's configure script with the --with-cc option set as follows:

    $ ./configure --with-cc=clang

Note that the asm_fast* and reg* grades are not usable with clang as they rely on GNU C extensions that clang does not provide.

Versions of LLVM (the underlying compiler infrastructure used by clang) before about version 2.9 contain bugs that require most C compiler optimizations to be disabled when compiling Mercury generated C code with clang (i.e. the generated C files have to be compiled at -O0). If you are using a more recent version of LLVM then the configure script will automatically enable a higher level of optimization.