https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118831
--- Comment #2 from jcldc13 at gmail dot com --- (In reply to Richard Biener from comment #1) > I don't think you can do this in F77, you need to properly use iso_c99 > bindings. > You likely get the "unprototyped" call ABI which differs from varargs. What do you mean ? It can not work on aarch64 architecture or not at all architecture ? Because I am working on a project, for many years, mixing f77 and c code, which is compiling/running fine on x86-64 arch but not anymore on arm arch.