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* [Bug c++/99558] New: wrong argument types reported for "no matching function" error message if ctor argument is a variable
@ 2021-03-12 8:30 jfhart085 at gmail dot com
2021-03-12 9:30 ` [Bug c++/99558] " redi at gcc dot gnu.org
2021-03-13 7:15 ` jfhart085 at gmail dot com
0 siblings, 2 replies; 3+ messages in thread
From: jfhart085 at gmail dot com @ 2021-03-12 8:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99558
Bug ID: 99558
Summary: wrong argument types reported for "no matching
function" error message if ctor argument is a variable
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jfhart085 at gmail dot com
Target Milestone: ---
Created attachment 50371
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50371&action=edit
utl2.cc - demonstrates using deliberate error message from compile
Wrong argument types are reported for "no matching function" error message for
a ctor if a ctor argument is a variable. The argument is reported as being a
reference when it is not. An error message is deliberately generated to
demonstrate the problem as follows:
wrong argument type: variable used as argument, first argument is shown as
"int &" but is actually "int" :
$ g++ -c -o utl2.o utl2.cc
utl2.cc: In function "int main()":
utl2.cc:13:5: error: no matching function for call to "cls4::cls4(int&, int)"
correct argument type: constant used as argument, first argument is correctly
shown as "int"
$ g++ -D DBG1 -c -o utl2.o utl2.cc
utl2.cc: In function "int main()":
utl2.cc:13:5: error: no matching function for call to "cls4::cls4(int, int)"
from gcc -v :
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /home/jhart/temp1/gcc-10.2.0/configure --prefix=/usr
--disable-multilib --with-system-zlib --enable-languages=c,c++,fortran
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC)
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/99558] wrong argument types reported for "no matching function" error message if ctor argument is a variable
2021-03-12 8:30 [Bug c++/99558] New: wrong argument types reported for "no matching function" error message if ctor argument is a variable jfhart085 at gmail dot com
@ 2021-03-12 9:30 ` redi at gcc dot gnu.org
2021-03-13 7:15 ` jfhart085 at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: redi at gcc dot gnu.org @ 2021-03-12 9:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99558
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to J. Hart from comment #0)
> $ g++ -c -o utl2.o utl2.cc
> utl2.cc: In function "int main()":
> utl2.cc:13:5: error: no matching function for call to "cls4::cls4(int&, int)"
>
> correct argument type: constant used as argument, first argument is
> correctly shown as "int"
GCC is correct. When you use a variable you are passing an lvalue of type int,
which is what int& means. When you pass a constant it is an rvalue, i.e. int.
>
> $ g++ -D DBG1 -c -o utl2.o utl2.cc
> utl2.cc: In function "int main()":
> utl2.cc:13:5: error: no matching function for call to "cls4::cls4(int, int)"
Because you're passing two rvalues.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/99558] wrong argument types reported for "no matching function" error message if ctor argument is a variable
2021-03-12 8:30 [Bug c++/99558] New: wrong argument types reported for "no matching function" error message if ctor argument is a variable jfhart085 at gmail dot com
2021-03-12 9:30 ` [Bug c++/99558] " redi at gcc dot gnu.org
@ 2021-03-13 7:15 ` jfhart085 at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: jfhart085 at gmail dot com @ 2021-03-13 7:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99558
--- Comment #2 from J. Hart <jfhart085 at gmail dot com> ---
Thank you very much for your kind attention and assistance. I had
thought it was indicating a reference rather than an lvalue. Your
correction is most useful and appreciated. I deliberately introduced
the second error to demonstrate the first, so the second one was expected.
Thanks again,
J. Hart
On 03/12/2021 06:30 PM, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99558
>
> Jonathan Wakely <redi at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> Resolution|--- |INVALID
> Status|UNCONFIRMED |RESOLVED
>
> --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> (In reply to J. Hart from comment #0)
>> $ g++ -c -o utl2.o utl2.cc
>> utl2.cc: In function "int main()":
>> utl2.cc:13:5: error: no matching function for call to "cls4::cls4(int&, int)"
>>
>> correct argument type: constant used as argument, first argument is
>> correctly shown as "int"
> GCC is correct. When you use a variable you are passing an lvalue of type int,
> which is what int& means. When you pass a constant it is an rvalue, i.e. int.
>
>> $ g++ -D DBG1 -c -o utl2.o utl2.cc
>> utl2.cc: In function "int main()":
>> utl2.cc:13:5: error: no matching function for call to "cls4::cls4(int, int)"
> Because you're passing two rvalues.
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-12 8:30 [Bug c++/99558] New: wrong argument types reported for "no matching function" error message if ctor argument is a variable jfhart085 at gmail dot com
2021-03-12 9:30 ` [Bug c++/99558] " redi at gcc dot gnu.org
2021-03-13 7:15 ` jfhart085 at gmail dot com
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