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* c.opt (Wmissing-include-dirs): New. * c-opts.c (c_common_handle_option): Pass true for user_supplied_p to add_path () for -I, but false for OPT_idirafter, OPT_iquote and OPT_isystem. Handle case OPT_Wmissing_include_dirs. * c-incpath.h (add_path): Add fourth (bool) argument. * c-incpath.c (add_env_var_paths): Pass false to add_path (). (add_standard_paths): Likewise. (remove_duplicates) [REASON_NOENT]: Warn if -Wmissing-include-dirs is used and the directory was user-supplied via -I. (add_path): Set p->user_supplied_p. Remove duplicated code by using add_cpp_dir_path (). * cpplib.h (struct cpp_options): Add warn_missing_include_dirs. (struct cpp_dir): Add user_supplied_p. * doc/invoke.texi (Warning Options): Document new option. [testsuite] * gcc.dg/cpp/Wmissingdirs.c: New. From-SVN: r82121
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