https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112571
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Joseph Myers <js...@gcc.gnu.org>: https://gcc.gnu.org/g:d22d1a9346f27db41459738c6eb404f8f0956e6f commit r14-8669-gd22d1a9346f27db41459738c6eb404f8f0956e6f Author: Joseph Myers <josmy...@redhat.com> Date: Wed Jan 31 21:39:53 2024 +0000 c: Fix ICE for nested enum redefinitions with/without fixed underlying type [PR112571] Bug 112571 reports an ICE-on-invalid for cases where an enum is defined, without a fixed underlying type, inside the enum type specifier for a definition of that same enum with a fixed underlying type. The ultimate cause is attempting to access ENUM_UNDERLYING_TYPE in a case where it is NULL. Avoid this by clearing ENUM_FIXED_UNDERLYING_TYPE_P in thie case of inconsistent definitions. Bootstrapped wth no regressions for x86_64-pc-linux-gnu. PR c/112571 gcc/c/ * c-decl.cc (start_enum): Clear ENUM_FIXED_UNDERLYING_TYPE_P when defining without a fixed underlying type an enumeration previously declared with a fixed underlying type. gcc/testsuite/ * gcc.dg/c23-enum-9.c, gcc.dg/c23-enum-10.c: New tests.
