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gcc/c-family/ChangeLog PR tree-optimization/80532 * c.opt (-Wuse-after-free): New options. gcc/ChangeLog: PR tree-optimization/80532 * common.opt (-Wuse-after-free): New options. * diagnostic-spec.c (nowarn_spec_t::nowarn_spec_t): Handle OPT_Wreturn_local_addr and OPT_Wuse_after_free_. * diagnostic-spec.h (NW_DANGLING): New enumerator. * doc/invoke.texi (-Wuse-after-free): Document new option. * gimple-ssa-warn-access.cc (pass_waccess::check_call): Rename... (pass_waccess::check_call_access): ...to this. (pass_waccess::check): Rename... (pass_waccess::check_block): ...to this. (pass_waccess::check_pointer_uses): New function. (pass_waccess::gimple_call_return_arg): New function. (pass_waccess::warn_invalid_pointer): New function. (pass_waccess::check_builtin): Handle free and realloc. (gimple_use_after_inval_p): New function. (get_realloc_lhs): New function. (maybe_warn_mismatched_realloc): New function. (pointers_related_p): New function. (pass_waccess::check_call): Call check_pointer_uses. (pass_waccess::execute): Compute and free dominance info. libcpp/ChangeLog: * files.c (_cpp_find_file): Substitute a valid pointer for an invalid one to avoid -Wuse-after-free. libiberty/ChangeLog: * regex.c: Suppress -Wuse-after-free. gcc/testsuite/ChangeLog: PR tree-optimization/80532 * gcc.dg/Wmismatched-dealloc-2.c: Avoid -Wuse-after-free. * gcc.dg/Wmismatched-dealloc-3.c: Same. * gcc.dg/analyzer/file-1.c: Prune expected warning. * gcc.dg/analyzer/file-2.c: Same. * gcc.dg/attr-alloc_size-6.c: Disable -Wuse-after-free. * gcc.dg/attr-alloc_size-7.c: Same. * c-c++-common/Wuse-after-free-2.c: New test. * c-c++-common/Wuse-after-free-3.c: New test. * c-c++-common/Wuse-after-free-4.c: New test. * c-c++-common/Wuse-after-free-5.c: New test. * c-c++-common/Wuse-after-free-6.c: New test. * c-c++-common/Wuse-after-free-7.c: New test. * c-c++-common/Wuse-after-free.c: New test. * g++.dg/warn/Wmismatched-dealloc-3.C: New test. * g++.dg/warn/Wuse-after-free.C: New test.