ci: revert the part of f665055 that affected vlib/v/, to fix the failing jobs asap

Author: spytheman

vlib/v/gen/c/auto_str_methods.v

@@ -1034,15 +1034,7 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, lang ast.Language, styp strin
 		if base_typ.has_flag(.shared_f) {
 			base_typ = base_typ.clear_flag(.shared_f).deref()
 		}
-		// For C structs, voidptr/byteptr fields in V may have different actual types in C headers,
-		// so we use string format instead of pointer format to avoid invalid casts.
-		// charptr fields are excluded as they are properly handled by builtin__tos4.
-		mut base_fmt := g.type_to_fmt(base_typ)
-		is_c_voidptr_field := is_c_struct && field.typ in ast.cptr_types
-			&& field.typ !in ast.charptr_types
-		if is_c_voidptr_field {
-			base_fmt = .si_s
-		}
+		base_fmt := g.type_to_fmt(base_typ)
 		is_opt_field := field.typ.has_flag(.option)
 
 		// manage prefix and quote symbol for the filed
@@ -1104,11 +1096,6 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, lang ast.Language, styp strin
 		it_field_name := 'it${op}${field_name}'
 		if ftyp_nr_muls > 1 || field.typ in ast.cptr_types {
 			if is_opt_field {
-			} else if is_c_voidptr_field {
-				// For C structs, the actual type may differ from V's declaration,
-				// so we just output a placeholder instead of trying to cast
-				func = '_S("<cptr>")'
-				caller_should_free = false
 			} else {
 				func = '(voidptr) ${it_field_name}'
 				caller_should_free = false
@@ -1149,8 +1136,8 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, lang ast.Language, styp strin
 				fn_body.write_string('${funcprefix}_S("<circular>")')
 			}
 		} else {
-			// manage C charptr (but not our placeholder for C struct voidptr fields)
-			if field.typ in ast.charptr_types && !is_c_voidptr_field {
+			// manage C charptr
+			if field.typ in ast.charptr_types {
 				fn_body.write_string('builtin__tos4((byteptr)${func})')
 			} else {
 				if field.typ.is_ptr() && sym.kind in [.struct, .interface] {

vlib/v/gen/c/str_intp.v

@@ -165,9 +165,8 @@ fn (mut g Gen) str_format(node ast.StringInterLiteral, i int, fmts []u8) (u64, s
 			}
 		}
 	} else {
-		// For unknown types (like C structs), use string format
-		// so that their str() method will be called
-		fmt_type = .si_s
+		// TODO: better check this case
+		fmt_type = .si_p
 	}
 
 	/*

vlib/v/tests/printing_c_structs/cstruct.h

@@ -2,16 +2,3 @@
 struct Abc {
    char *char_pointer_field;
 };
-
-// Simulates a struct like FT_Generic which is a struct, not a pointer
-struct InnerStruct {
-   int x;
-   int y;
-};
-
-// Simulates a struct like FT_FaceRec which has InnerStruct fields
-// that might be declared as voidptr in V bindings
-struct OuterStruct {
-   int id;
-   struct InnerStruct inner;  // This is a struct value, not a pointer
-};