https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88525
Bug ID: 88525 Summary: gcc thinks that C11 program does not declare anything but it does. Product: gcc Version: 9.0 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 C11 program (prog.c): int main() { struct { enum { a } b; }; } This program does NOT violate rule 6.7.2 in the C11 standard since the declaration declares a member of an enum (a). I tried to compile it with the following command line: gcc prog.c -std=c11 -pedantic-errors I get the following unexpected error message: error: unnamed struct/union that defines no instances This is wrong. The declaration does declare the enum member a and according to the C11 standard it does not need to declare anything else.