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From: "sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/111681] New: Missing fixit for exception name in catch
Date: Tue, 03 Oct 2023 16:18:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111681

            Bug ID: 111681
           Summary: Missing fixit for exception name in catch
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
                CC: dmalcolm at gcc dot gnu.org
  Target Milestone: ---

Noticed with a Blender issue w/ GCC 13 (missing transitive include for
<system_error>, https://bugs.gentoo.org/914740).

If I just take the example at
https://en.cppreference.com/w/cpp/error/system_error and mangle it, I get:
```
#include <thread>

int main()
{
    try
    {
        std::thread().detach(); // attempt to detach a non-thread
    }
    catch(const std::system_error& e)
    {
        std::cout << "Caught system_error with code "
                     "[" << e.code() << "] meaning "
                     "[" << e.what() << "]\n";
    }
}
```

with:
```
$ g++-14 /tmp/foo.cxx -o /tmp/foo
/tmp/foo.cxx: In function =E2=80=98int main()=E2=80=99:
/tmp/foo.cxx:9:34: error: expected unqualified-id before =E2=80=98&=E2=80=
=99 token
    9 |     catch(const std::system_error& e)
      |                                  ^
/tmp/foo.cxx:9:34: error: expected =E2=80=98)=E2=80=99 before =E2=80=98&=E2=
=80=99 token
    9 |     catch(const std::system_error& e)
      |          ~                       ^
      |                                  )
/tmp/foo.cxx:9:34: error: expected =E2=80=98{=E2=80=99 before =E2=80=98&=E2=
=80=99 token
/tmp/foo.cxx:9:36: error: =E2=80=98e=E2=80=99 was not declared in this scope
    9 |     catch(const std::system_error& e)
      |                                    ^
```

The error message here could be better, but even better would be a fixit sa=
ying
to include <system_error>.=