https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103496
anlauf at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |anlauf at gcc dot gnu.org --- Comment #1 from anlauf at gcc dot gnu.org --- I learned from Steve that there is a recent interp regarding C_SIZEOF arguments, https://j3-fortran.org/doc/year/21/21-134r2.txt but it still requires using interoperable types etc. Just asking: did you simply forget to "decorate" your declarations?