https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99922
kargl at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2021-04-06 Status|UNCONFIRMED |NEW CC| |kargl at gcc dot gnu.org Priority|P3 |P4 Ever confirmed|0 |1 --- Comment #1 from kargl at gcc dot gnu.org --- (In reply to Brad Richardson from comment #0) > > So this is supposed to be allowed, and I can confirm that I can compile and > execute the above example and obtain the expected result with Intel (ifort > and icc). > What result did Intel produce? This patch suppresses the error message, which allows the code to compile. gfortran may produces wrong code. Someone else can investigate that issue diff --git a/gcc/fortran/decl.c b/gcc/fortran/decl.c index 9039c9dca2a..b10a92ca234 100644 --- a/gcc/fortran/decl.c +++ b/gcc/fortran/decl.c @@ -1549,19 +1549,21 @@ gfc_verify_c_interop_param (gfc_symbol *sym) sym->ns->proc_name->name); } - /* Character strings are only C interoperable if they have a - length of 1. */ - if (sym->ts.type == BT_CHARACTER && !sym->attr.dimension) + /* In F2008 (and earlier?) a character string is only C + interoperable if it has a length of 1. With F2018, if the + string is a dummy argument, it can have an assumed length if + the formal argument is CFI_cdesc_t. */ + if (sym->ts.type == BT_CHARACTER && !sym->attr.dimension + && !((gfc_option.allow_std & GFC_STD_F2018) && sym->attr.dummy)) { gfc_charlen *cl = sym->ts.u.cl; + if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT || mpz_cmp_si (cl->length->value.integer, 1) != 0) { - gfc_error ("Character argument %qs at %L " - "must be length 1 because " - "procedure %qs is BIND(C)", - sym->name, &sym->declared_at, - sym->ns->proc_name->name); + gfc_error ("Character argument %qs at %L must be length 1 " + "because procedure %qs is BIND(C)", sym->name, + &sym->declared_at, sym->ns->proc_name->name); retval = false; } }