https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95658
Bug ID: 95658
Summary: Bogus duplicate error message in "decltype(auto)" type
specifier
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: haoxintu at gmail dot com
Target Milestone: ---
This code bug.cc in GCC 8.1 - 9.3 gives the bogus duplicate error messages.
$cat bug.cc
decltype (auto) var = 0;
Take GCC-9, GCC-10, GCC-trunk for example,
$g++-9 -c -std=c++11 bug.cc
bug.cc:1:11: error: expected primary-expression before ‘auto’
1 | decltype (auto) var = 0;
| ^~~~
bug.cc:1:11: error: expected ‘)’ before ‘auto’
1 | decltype (auto) var = 0;
| ~^~~~
| )
bug.cc:1:11: error: expected primary-expression before ‘auto’
1 | decltype (auto) var = 0;
| ^~~~
bug.cc:1:11: error: expected primary-expression before ‘auto’
bug.cc:1:11: error: expected primary-expression before ‘auto’
bug.cc:1:11: error: expected primary-expression before ‘auto’
bug.cc:1:1: error: expected unqualified-id before ‘decltype’
1 | decltype (auto) var = 0;
| ^~~~~~~~
$g++-10 -c -std=c++11 bug.cc
bug.cc:1:11: error: expected primary-expression before ‘auto’
1 | decltype (auto) var = 0;
| ^~~~
$g++-trunk -c -std=c++11 bug.cc
bug.cc:1:11: error: expected primary-expression before ‘auto’
1 | decltype (auto) var = 0;
| ^~~~
GCC versions I used are
$g++-9 --version
g++-9 (Ubuntu 9.3.0-11ubuntu0~18.04.1) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$g++-10 --version
g++-10 (Ubuntu 10.1.0-2ubuntu1~18.04) 10.1.0
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$g++-trunk --version
g++ (GCC) 11.0.0 20200526 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
