[Bug c++/11582] Odd error message with dynamically sized template arg printing
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582 Wolfgang Bangerth changed: What|Removed |Added Resolution|--- |FIXED Status|NEW |RESOLVED --- Comment #13 from Wolfgang Bangerth --- Sure, good enough. I think `' isn't quite correct: it's a variably-sized type, so the size can not be determined at compile time. This is the part that is missing from the error message. But I don't think it's worthwhile keeping the report open.
[Bug c++/11582] Odd error message with dynamically sized template arg printing
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582 --- Comment #12 from Andrew Pinski --- Since GCC 11 we produce: : In function 'void g()': :7:4: error: no matching function for call to 'f(int [])' 7 | f( buf ) ; | ~^~~ :3:28: note: candidate: 'template void f(int (&)[N])' 3 | template void f(int (&)[N]); |^ :3:28: note: template argument deduction/substitution failed: :7:4: note: variable-sized array type 'long int' is not a valid template argument 7 | f( buf ) ; | ~^~~ GCC 11 removes the ( + 1) part and just changes it to be . Is this warning good now?
[Bug c++/11582] Odd error message with dynamically sized template arg printing
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582 Martin Sebor changed: What|Removed |Added Priority|P2 |P3 CC||msebor at gcc dot gnu.org Severity|normal |minor --- Comment #11 from Martin Sebor --- Today's trunk of GCC 7 prints the following. Since there doesn't appear to be a "correct" way to print the function signature (although several attempts seem to have been made none has been found since 2003), if the bug is to stay open, I think its priority and importance should be lower. Setting P3 and Minor. t.C: In function ‘void g()’: t.C:6:10: error: no matching function for call to ‘f(int [( + 1)])’ f( buf ) ; ^ t.C:2:28: note: candidate: template void f(int (&)[N]) template void f(int (&)[N]); ^ t.C:2:28: note: template argument deduction/substitution failed: t.C:6:10: note: variable-sized array type ‘long int’ is not a valid template argument f( buf ) ; ^ The messages printed by some other compilers are below for reference. Personally, I think the Visual Studio error looks quite good. Clang 3.8: t.C:6:3: error: no matching function for call to 'f' f( buf ) ; ^ t.C:2:28: note: candidate template ignored: could not match 'int' against 'int' template void f(int (&)[N]); ^ IBM XLC++: "t.C", line 2.28: 1540-1173 (S) "int (&)[]" is not a valid parameter type. "t.C", line 6.3: 1540-0700 (I) The previous message was produced while processing "f<0>". Intel ICC 17: error: no instance of function template "f" matches the argument list note: this candidate was rejected because at least one template argument could not be deduced Microsoft Visual Studio: error C2672: 'f': no matching overloaded function found source_file.cpp(6): error C2784: 'void f(int (&)[N])': could not deduce template argument for 'int (&)[N]' from 'int ['function']' source_file.cpp(2): note: see declaration of 'f' Oracle Solaris Studio 12.4: "t.C", line 5: Error: An integer constant expression is required within the array subscript operator.
[Bug c++/11582] Odd error message with dynamically sized template arg printing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582 --- Comment #8 from Gabriel Dos Reis gdr at gcc dot gnu.org 2013-04-22 10:10:36 UTC --- (In reply to comment #7) The '[(((sizetype)anonymous) + 1)]' is just awful. If we don't know the actual type there, that is int [size()], then we should just print 'int []' or 'int [size_t]' or something similar to denote a VLA. Surprisingly, Clang++ is even more confused: test.cc:6:3: error: no matching function for call to 'f' f( buf ) ; ^ test.cc:2:28: note: candidate template ignored: could not match 'int' against 'int' template int N void f(int ()[N]); ^ test.cc:13:3: error: no matching function for call to 'f' f( buf ) ; ^ test.cc:2:28: note: candidate template ignored: could not match 'int' against 'int' template int N void f(int ()[N]); ^ Printing int[] or int[size_t] would be confusing too. Yes, Clang is not the gold standard.
[Bug c++/11582] Odd error message with dynamically sized template arg printing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582
--- Comment #9 from Manuel López-Ibáñez manu at gcc dot gnu.org 2013-04-22
10:38:05 UTC ---
(In reply to comment #8)
Printing int[] or int[size_t] would be confusing too.
More confusing than int[(((sizetype)anonymous) + 1)] ?
What about?
t7881.cc: In function ‘void g()’:
t7881.cc:6:10: error: no matching function for call to ‘f(int
[{variable-length}])’
t7881.cc:6:10: note: candidate is:
t7881.cc:2:23: note: templateint N void f(int ()[N])
t7881.cc:2:23: note: template argument deduction/substitution failed:
t7881.cc:6:10: note: variable-sized array type is not a valid template
argument
[Bug c++/11582] Odd error message with dynamically sized template arg printing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582
--- Comment #10 from Gabriel Dos Reis gdr at gcc dot gnu.org 2013-04-23
03:45:56 UTC ---
(In reply to comment #9)
(In reply to comment #8)
Printing int[] or int[size_t] would be confusing too.
More confusing than int[(((sizetype)anonymous) + 1)] ?
What about?
t7881.cc: In function ‘void g()’:
t7881.cc:6:10: error: no matching function for call to ‘f(int
[{variable-length}])’
t7881.cc:6:10: note: candidate is:
t7881.cc:2:23: note: templateint N void f(int ()[N])
t7881.cc:2:23: note: template argument deduction/substitution failed:
t7881.cc:6:10: note: variable-sized array type is not a valid template
argument
Remember that an array type as a function parameter is equivalent to a
pointer type.
[Bug c++/11582] Odd error message with dynamically sized template arg printing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582 Manuel López-Ibáñez manu at gcc dot gnu.org changed: What|Removed |Added CC||manu at gcc dot gnu.org --- Comment #7 from Manuel López-Ibáñez manu at gcc dot gnu.org 2013-04-19 17:13:38 UTC --- The '[(((sizetype)anonymous) + 1)]' is just awful. If we don't know the actual type there, that is int [size()], then we should just print 'int []' or 'int [size_t]' or something similar to denote a VLA. Surprisingly, Clang++ is even more confused: test.cc:6:3: error: no matching function for call to 'f' f( buf ) ; ^ test.cc:2:28: note: candidate template ignored: could not match 'int' against 'int' template int N void f(int ()[N]); ^ test.cc:13:3: error: no matching function for call to 'f' f( buf ) ; ^ test.cc:2:28: note: candidate template ignored: could not match 'int' against 'int' template int N void f(int ()[N]); ^
[Bug c++/11582] Odd error message with dynamically sized template arg printing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11582 --- Comment #6 from Andrew Pinski pinskia at gcc dot gnu.org 2012-02-02 00:30:07 UTC --- t788.cc: In function ‘void g()’: t788.cc:6:10: error: no matching function for call to ‘f(int [(((sizetype)anonymous) + 1)])’ t788.cc:6:10: note: candidate is: t788.cc:2:28: note: templateint N void f(int ()[N]) t788.cc:2:28: note: template argument deduction/substitution failed: t788.cc:6:10: note: variable-sized array type ‘int [(((sizetype)anonymous) + 1)]’ is not a valid template argument And t7881.cc: In function ‘void g()’: t7881.cc:6:10: error: no matching function for call to ‘f(int [(((sizetype)anonymous) + 1)])’ t7881.cc:6:10: note: candidate is: t7881.cc:2:23: note: templateint N void f(int ()[N]) t7881.cc:2:23: note: template argument deduction/substitution failed: t7881.cc:6:10: note: variable-sized array type ‘int [(((sizetype)anonymous) + 1)]’ is not a valid template argument
