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When structure types are completed and are variably-modified, we need to make sure that C_TYPE_VARIABLY_MODIFIED is updated also for derived types. For derived types which are not updated and remain TYPE_STRUCTURAL_EQUALITY_P, we do recursion when checking the bit instead. This change then fixes also a weird corner case when forming composite types of mutually recursively defined types. We do not update other structure or union type that end up with variably modified pointers, as it is not clear this is needed and also needs further analysis. PR c/123424 gcc/c/ChangeLog: * c-decl.cc (c_update_variably_modified): New function. (finish_struct): Call c_update_variably_modified. * c-tree.h (c_variably_modified_p): Recurse if necessary. * c-typeck.cc (c_verify_type): Update. (c_set_type_bits): Use c_variably_modified_p. (mark_decl_used): Dito. (build_function_call_vec): Dito. (c_build_qualified_type): Dito. * c-objc-common.cc (c_var_p): Dito. gcc/testsuite/ChangeLog: * gcc.dg/gnu23-tag-composite-7.c: New test. * gcc.dg/gnu23-varmod-3.c: New test. * gcc.dg/pr123424.c: New test.
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