https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63645
Markus Trippelsdorf <trippels at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |trippels at gcc dot gnu.org Resolution|--- |INVALID --- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Your union simply takes more space than your GnmExprBinary struct and you cast the later to the former. vvv.c:36:13: runtime error: member access within address 0x0000011ec010 with insufficient space for an object of type 'const GnmExpr' (aka 'const union _GnmExpr')