https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107268
Bug ID: 107268
Summary: Poor diagnostic for missing colon in ctor-initializer
Product: gcc
Version: 12.2.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
struct UsesAlloc
{
bool passed_alloc;
UsesAlloc(int) passed_alloc(false) { }
};
The user forgot to type the ':' in the constructor, but GCC says:
parser_diag.C:5:16: error: expected ‘;’ at end of member declaration
5 | UsesAlloc(int) passed_alloc(false) { }
| ^
| ;
parser_diag.C:5:31: error: expected identifier before ‘false’
5 | UsesAlloc(int) passed_alloc(false) { }
| ^~~~~
parser_diag.C:5:31: error: expected ‘,’ or ‘...’ before ‘false’
parser_diag.C:5:18: error: ISO C++ forbids declaration of ‘passed_alloc’ with
no type [-fpermissive]
5 | UsesAlloc(int) passed_alloc(false) { }
| ^~~~~~~~~~~~
parser_diag.C:5:40: error: ‘int UsesAlloc::passed_alloc(int)’ conflicts with a
previous declaration
5 | UsesAlloc(int) passed_alloc(false) { }
| ^
parser_diag.C:3:8: note: previous declaration ‘bool UsesAlloc::passed_alloc’
3 | bool passed_alloc;
| ^~~~~~~~~~~~
parser_diag.C: In member function ‘int UsesAlloc::passed_alloc(int)’:
parser_diag.C:5:40: warning: no return statement in function returning non-void
[-Wreturn-type]
5 | UsesAlloc(int) passed_alloc(false) { }
| ^
That's a lot of output. Clang is less noisy, though still not very helpful:
parser_diag.C:5:17: error: expected ';' at end of declaration list
UsesAlloc(int) passed_alloc(false) { }
^
;
1 error generated.
EDG is similar:
"parser_diag.C", line 5: error: expected a ";"
UsesAlloc(int) passed_alloc(false) { }
^
1 error detected in the compilation of "parser_diag.C".
It would be better GCC if print a single line like Clang and EDG, but it would
be even better if it suggested that a ':' is missing, instead of a ';' (because
either of those is valid there).
