+ if (warn_missing_parameter_type == -1)
+ warn_missing_parameter_type = extra_warnings;
+ if (warn_old_style_declaration == -1)
+ warn_old_style_declaration = extra_warnings;
+ if (warn_override_init == -1)
+ warn_override_init = extra_warnings;
+ if (warn_ignored_qualifiers == -1)
+ warn_ignored_qualifiers = extra_warnings;
+ if (warn_logical_op == -1)
+ warn_logical_op = extra_warnings;
+
+ /* -Wpointer-sign is disabled by default, but it is enabled if any
+ of -Wall or -pedantic are given. */
+ if (warn_pointer_sign == -1)
+ warn_pointer_sign = 0;
+
+ if (warn_strict_aliasing == -1)
+ warn_strict_aliasing = 0;
+ if (warn_strict_overflow == -1)
+ warn_strict_overflow = 0;
+
+ /* -Woverlength-strings is off by default, but is enabled by -pedantic.
+ It is never enabled in C++, as the minimum limit is not normative
+ in that standard. */
+ if (warn_overlength_strings == -1 || c_dialect_cxx ())
+ warn_overlength_strings = 0;
+
+ /* Wmain is enabled by default in C++ but not in C. */
+ /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
+ even if -Wall was given (warn_main will be 2 if set by -Wall, 1
+ if set by -Wmain). */
+ if (warn_main == -1)
+ warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
+ else if (warn_main == 2)
+ warn_main = flag_hosted ? 1 : 0;
+
+ /* In C, -Wconversion enables -Wsign-conversion (unless disabled
+ through -Wno-sign-conversion). While in C++,
+ -Wsign-conversion needs to be requested explicitly. */
+ if (warn_sign_conversion == -1)
+ warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
+
+ /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
+ in c_common_handle_option; if it has not yet been set, it is
+ disabled by default. In C++, it is enabled by default. */
+ if (warn_enum_compare == -1)
+ warn_enum_compare = c_dialect_cxx () ? 1 : 0;
+
+ /* -Wpacked-bitfield-compat is on by default for the C languages. The
+ warning is issued in stor-layout.c which is not part of the front-end so
+ we need to selectively turn it on here. */
+ if (warn_packed_bitfield_compat == -1)
+ warn_packed_bitfield_compat = 1;