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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/53220] [4.7/4.8 Regression] g++ mis-compiles compound literals Date: Tue, 28 Nov 2023 21:29:26 +0000 [thread overview] Message-ID: <bug-53220-4-5qeA769YPV@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-53220-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53220 --- Comment #23 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>: https://gcc.gnu.org/g:305a2686c99bf9b57490419f25c79f6fb3ae0feb commit r14-5941-g305a2686c99bf9b57490419f25c79f6fb3ae0feb Author: Jason Merrill <jason@redhat.com> Date: Tue Nov 28 13:54:47 2023 -0500 c++: prvalue array decay [PR94264] My change for PR53220 made array to pointer decay for prvalue arrays ill-formed to catch well-defined C code that produces a dangling pointer in C++ due to the shorter lifetime of compound literals. This wasn't really correct, but wasn't a problem until C++17 added prvalue arrays, at which point it started rejecting valid C++ code. I wanted to make sure that we still diagnose the problematic code; -Wdangling-pointer covers the array-lit.c case, but I needed to extend -Wreturn-local-addr to handle the return case. PR c++/94264 PR c++/53220 gcc/c/ChangeLog: * c-typeck.cc (array_to_pointer_conversion): Adjust -Wc++-compat diagnostic. gcc/cp/ChangeLog: * call.cc (convert_like_internal): Remove obsolete comment. * typeck.cc (decay_conversion): Allow array prvalue. (maybe_warn_about_returning_address_of_local): Check for returning pointer to temporary. gcc/testsuite/ChangeLog: * c-c++-common/array-lit.c: Adjust. * g++.dg/cpp1z/array-prvalue1.C: New test. * g++.dg/ext/complit17.C: New test.
prev parent reply other threads:[~2023-11-28 21:29 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-05-03 19:50 [Bug c++/53220] New: " ppluzhnikov at google dot com 2012-05-03 19:53 ` [Bug c++/53220] " ppluzhnikov at google dot com 2012-05-03 22:38 ` [Bug c++/53220] [4.7/4.8 Regression] " hjl.tools at gmail dot com 2012-05-04 9:03 ` rguenth at gcc dot gnu.org 2012-05-04 18:53 ` xinliangli at gmail dot com 2012-05-07 14:33 ` jason at gcc dot gnu.org 2012-05-07 16:25 ` xinliangli at gmail dot com 2012-05-07 16:55 ` ppluzhnikov at google dot com 2012-05-07 17:18 ` xinliangli at gmail dot com 2012-05-07 17:55 ` jason at gcc dot gnu.org 2012-05-08 0:34 ` xinliangli at gmail dot com 2012-05-08 2:22 ` jason at gcc dot gnu.org 2012-05-17 0:13 ` ppluzhnikov at google dot com 2012-05-22 17:42 ` jason at gcc dot gnu.org 2012-05-22 17:50 ` ppluzhnikov at google dot com 2012-05-22 18:05 ` ppluzhnikov at google dot com 2012-05-26 21:20 ` jason at gcc dot gnu.org 2012-05-30 14:52 ` jason at gcc dot gnu.org 2012-06-03 4:50 ` jason at gcc dot gnu.org 2012-06-20 1:59 ` ppluzhnikov at google dot com 2012-06-20 7:20 ` jason at gcc dot gnu.org 2013-05-01 9:54 ` superaxioma at hotmail dot com 2013-05-01 19:13 ` jason at gcc dot gnu.org 2023-11-28 21:29 ` cvs-commit at gcc dot gnu.org [this message]
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