https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67006
Bug ID: 67006 Summary: type-specifier const in declaration of anonymous union Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: anders.granlund.0 at gmail dot com Target Milestone: --- Consider the following program (prog.cc): const union {}; int main() {} It is ill-formed by [dcl.type.cv] http://eel.is/c++draft/dcl.dcl#dcl.type.cv-1: "If a cv-qualifier appears in a decl-specifier-seq, the init-declarator-list of the declaration shall not be empty." Compile the program with the following command line: g++ prog.cc -std=c++14 -pedantic-errors No error messages are given. I expected to get an error message here since the program is ill-formed. I tried this with gcc HEAD 6.0.0 201507, here: http://melpon.org/wandbox/permlink/lGKyEQQW4BtKube9