https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118765
--- Comment #20 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Martin Uecker <uec...@gcc.gnu.org>: https://gcc.gnu.org/g:accbc1b90bd942aa36ac1485a21056b774ce02df commit r15-8963-gaccbc1b90bd942aa36ac1485a21056b774ce02df Author: Martin Uecker <uec...@tugraz.at> Date: Sun Mar 16 10:54:17 2025 +0100 c: Fix tagname confusion for typedef redefinitions [PR118765] When we redefine a typedef for a tagged type that has just been redefined, merge_decls may produce invalid TYPE_DECLS that are not consistent with what set_underlying_type produces. This is fixed by updating DECL_ORIGINAL_TYPE. PR c/118765 gcc/c/ChangeLog: * c-decl.cc (merge_decls): For TYPE_DECLS copy DECL_ORIGINAL_TYPE from the old declaration. * c-typeck.cc (tagged_types_tu_compatible_p): Add checking assertions. gcc/testsuite/ChangeLog: * gcc.dg/pr118765-2.c: New test. * gcc.dg/pr118765-3.c: New test. * gcc.dg/typedef-redecl3.c: New test.
