Miscellaneous-NoEmptyStructs

Structs/unions must not be empty

Required inputs: IR

Standard C requires structs and unions to contain at least one named member. This restriction does not apply in C++, nor in C with GNU extensions. However, these languages treat empty structs differently: sizeof(struct EmptyStruct { }) is 1 in C++, but 0 in GNU C. To avoid portability problems, empty structs should be avoided in C code.

Possible Messages

Key	Text	Severity	Disabled
empty_struct	Empty struct has undefined behavior	None	False
empty_union	Empty union has undefined behavior	None	False
struct_without_named	struct without named members has undefined behavior	None	False
union_without_named	union without named members has undefined behavior	None	False

Options

• This rule shares the following common options: exclude_in_macros, exclude_messages_in_system_headers, excludes, extend_exclude_to_macro_invocations, includes, justification_checker, languages, post_processing, provider, report_at, severity

• The following places define options that affect this rule: Stylechecks, Analysis-GlobalOptions

• This rule has no individual options.