Flags in Foreign Code

Depending on the use_standard_c_and_cxx_flags option, the base :standard set of flags for C will contain only ocamlc_cflags or both ocamlc_cflags and ocamlc_cppflags.

There are multiple levels where one can declare custom flags (using the Ordered Set Language), and each level inherits the flags of the previous one in its :standard set:

• In the global env definition of a dune-workspace file

• In the per-context env definitions in a dune-workspace file

• In the env definition of a dune file

• In a foreign_stubs, foreign_library or extra_objects field of an executable or a library.

The %{cc} variable will contain the flags from the first three levels only.