Reuben Thomas wrote: > the ability to AC_DEFUN a > macro with a particular argument, as in:​ > > ​AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS(C)],​ > > so that it is possible to AC_REQUIRE such a macro.
The '(C)' part is not an argument to the function. It's part of the function name. By convention, such a function name is used to indicate the implementation of an autoconf macro for a particular _AC_LANG value. Bruno
