[Bug c++/85958] New: Make const qualifier error clear

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85958

            Bug ID: 85958
           Summary: Make const qualifier error clear
           Product: gcc
           Version: 8.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jg at jguk dot org
  Target Milestone: ---

Calling a function with a const int seems to give such an obscure message, can
it be made clearer?


output:

$ g++ -o main main.cpp -Wall -Werror -Wconversion
main.cpp: In function ‘int main()’:
main.cpp:11:25: error: binding ‘const int’ to reference of type ‘int&’ discards
qualifiers
     strstripspace(unused);
                         ^
main.cpp:5:6: note:   initializing argument 1 of ‘void strstripspace(int&)’
 void strstripspace(int & value);


Expected something clearer:
$ g++ -o main main.cpp -Wall -Werror -Wconversion
main.cpp: In function ‘int main()’:
main.cpp:11:25: error: passing ‘const int’ as reference of type ‘int&’ discards
qualifier const
     strstripspace(unused);
                         ^
main.cpp:5:6: note:   initializing argument 1 of ‘void strstripspace(int&)’
 void strstripspace(int & value);




/* g++ -o main main.cpp -Wall -Werror -Wconversion */

#include <string>

void strstripspace(int & value)
{
    return;
}

int main()
{
    const int unused = 0;

    strstripspace(unused);

    return 0;
}