https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119394
Bug ID: 119394
Summary: Add fixit hint suggesting adding () to [] noexcept {}
in C++ < 23
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redbeard0531 at gmail dot com
Target Milestone: ---
Note that clang alread does this: https://godbolt.org/z/73T38rWM7
void foo(auto){}
void test() {
foo([] noexcept {});
}
No fixit when running `g++ -std=c++20 -Wall -Werror`:
<source>: In function 'void test()':
<source>:3:12: error: parameter declaration before lambda exception
specification only optional with '-std=c++23' or '-std=gnu++23'
[-Werror=c++23-extensions]
3 | foo([] noexcept {});
| ^~~~~~~~
cc1plus: all warnings being treated as errors
Clang20 output with fixit:
<source>:3:12: error: lambda without a parameter clause is a C++23 extension
[-Werror,-Wc++23-extensions]
3 | foo([] noexcept {});
| ^
| ()
1 error generated.
It might also be better to just replace the technical sounding "parameter
declaration before lambda exception specification" with just "() before
noexcept on a lambda" which I think will be easier for the mythical "normal C++
developer" to understand.
