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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/107500] Useless atexit entry for ~constant_init in eh_globals.cc Date: Wed, 02 Nov 2022 14:38:41 +0000 [thread overview] Message-ID: <bug-107500-4-Bp6jcLsRj3@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-107500-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107500 --- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> --- Reduced: extern "C" int puts(const char*); struct A { constexpr A() { } ~A() { puts("bye"); } }; namespace { struct constant_init { union { A obj; }; constexpr constant_init() : obj() { } ~constant_init() { /* do nothing, union member is not destroyed */ } }; // Single-threaded fallback buffer. constinit constant_init global; } extern "C" A* get() { return &global.obj; } With -std=c++20 -Os GCC emits a call to atexit: (anonymous namespace)::constant_init::~constant_init() [base object destructor]: ret get: mov eax, OFFSET FLAT:_ZN12_GLOBAL__N_16globalE ret _GLOBAL__sub_I_get: mov edx, OFFSET FLAT:__dso_handle mov esi, OFFSET FLAT:_ZN12_GLOBAL__N_16globalE mov edi, OFFSET FLAT:_ZN12_GLOBAL__N_113constant_initD1Ev jmp __cxa_atexit With the same options, Clang doesn't: get: # @get lea rax, [rip + (anonymous namespace)::global] ret
next prev parent reply other threads:[~2022-11-02 14:38 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-01 17:53 [Bug c++/107500] New: " rdiezmail-gcc at yahoo dot de 2022-11-02 12:07 ` [Bug libstdc++/107500] " redi at gcc dot gnu.org 2022-11-02 12:08 ` [Bug c++/107500] " redi at gcc dot gnu.org 2022-11-02 12:13 ` redi at gcc dot gnu.org 2022-11-02 12:46 ` rdiezmail-gcc at yahoo dot de 2022-11-02 13:01 ` rdiezmail-gcc at yahoo dot de 2022-11-02 13:04 ` redi at gcc dot gnu.org 2022-11-02 13:09 ` redi at gcc dot gnu.org 2022-11-02 13:29 ` rdiezmail-gcc at yahoo dot de 2022-11-02 13:36 ` rdiezmail-gcc at yahoo dot de 2022-11-02 14:17 ` redi at gcc dot gnu.org 2022-11-02 14:38 ` redi at gcc dot gnu.org [this message] 2022-11-02 15:47 ` pinskia at gcc dot gnu.org 2022-11-02 16:12 ` rdiezmail-gcc at yahoo dot de 2022-11-02 17:16 ` redi at gcc dot gnu.org 2022-11-02 17:46 ` redi at gcc dot gnu.org 2022-11-03 7:57 ` rdiezmail-gcc at yahoo dot de 2022-11-03 11:52 ` redi at gcc dot gnu.org 2022-11-03 11:55 ` redi at gcc dot gnu.org 2022-11-04 9:42 ` sebastian.huber@embedded-brains.de 2022-11-04 12:43 ` rdiezmail-gcc at yahoo dot de 2022-11-04 14:05 ` cvs-commit at gcc dot gnu.org 2022-11-04 14:15 ` redi at gcc dot gnu.org 2022-11-04 14:58 ` rdiezmail-gcc at yahoo dot de 2022-11-04 20:40 ` rdiezmail-gcc at yahoo dot de 2023-05-08 12:25 ` rguenth at gcc dot gnu.org 2024-03-16 10:25 ` redi at gcc dot gnu.org 2024-03-16 10:29 ` [Bug c++/107500] [12 Regression] " redi at gcc dot gnu.org 2024-03-18 14:03 ` cvs-commit at gcc dot gnu.org 2024-05-22 15:48 ` redi at gcc dot gnu.org
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