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When compiling an OCaml project which links against libraries requiring the C++ standard library (e.g. LLVM’s OCaml bindings) using the -cc g++ argument to ocamlc with GCC >= 4.4 generates extremely verbose warning spew of the form:
warning: deprecated conversion from string constant to ‘char*’
How is it possible to remove these warnings?
The problem stems from
ocamlcgenerating intermediate C code which triggers warnings when compiled in C++ mode by newer versions of GCC. But this generated code need not be compiled as C++. The only reason to pass-cc g++for this common case of building against a wrapped C++ library is to ensure that the C++ standard library dependencies are built. The simpler solution, which avoids using the C++ front-end for compiling theocamlcintermediate code, is simply:which forces linking the generated C code with
libstdc++, while still compiling it in plain C mode.