https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106775
Bug ID: 106775
Summary: [11/12 regression] Subscipt operator with array rvalue
inside brackets returns lvalue
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: leduyquang753 at gmail dot com
Target Milestone: ---
Created attachment 53519
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53519&action=edit
The command-line invocation of GCC, its verbose output and the preprocessed
source.
Using the built-in subscript operator with an array rvalue to the left (outside
brackets) and an integer to the right (inside brackets) returns an xvalue as
expected:
test.cpp:10:21: error: using rvalue as lvalue [-fpremissive]
10 | getAnA().b[0] = 1;
| ~~~~~~~~~~~~^
But reversing the two operands makes GCC give an lvalue:
0[getAnA().b] = 1;
No diagnostic with -Wall -Wextra -pedantic.
(Full preprocessed code attached.)
Test compiled using GCC 12.2.0 on Arch Linux and additionally on Windows and
Compiler explorer. Previous versions of GCC were tested on Compiler explorer
using x86-64 arch.
Other notes: MSVC in Visual studio 2022 seems to have the same issue while
Clang 14 doesn't.
