[Bug c++/58589] New: diagnostics: missing proper file:line on C++ compilation error

[Bug c++/58589] New: diagnostics: missing proper file:line on C++ compilation error

[jan.kratochvil at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58589

            Bug ID: 58589
           Summary: diagnostics: missing proper file:line on C++
                    compilation error
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jan.kratochvil at redhat dot com
                CC: dodji at gcc dot gnu.org
            Target: x86_64-unknown-linux-gnu

#include <unordered_map>
#include <memory>
class X {
public:
  int a,&b; /* the reference disables default copy constructor */
  X():b(a) {}
};
class Y {
public:
  std::unordered_map<int,std::unique_ptr<X>> x; /* this hides the error line */
} a,b;
int main() { a=b; }

$ g++ -o test6 test6.C -Wall -std=gnu++11 2>&1|grep test6

Actual:
                 from test6.C:1:
                 from test6.C:1:
                 from test6.C:2:
Expected:
                 from test6.C:5:
(or at ltest test6.C:3)

There are many error lines also mentioning 'X' (although neither 'a' or 'b')
but none of them gives any line number where the problem comes from in test6.C.
Editors/IDE (error line parsers) then cannot show where the error comes from.

Also none of the errors is the one making the cause clear which one gets by
using plain 'X x;' (instead of using 'X' in unordered_map):
test6.C:3:7: error: non-static reference member ‘int& X::b’, can’t use default
assignment operator

BTW clang has the same diagnostics problem.
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Subject: [Bug c++/58584] [c++11] ICE with invalid argument for alignas
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX584

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dodji at gcc dot gnu.org,
                   |                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The first one started with r192199.

[Bug c++/58589] diagnostics: missing proper file:line on C++ compilation error

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58589

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
A minimized testcase would be appreciated:
https://gcc.gnu.org/bugs/minimize.html
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida612

--- Comment #3 from n8tm at aol dot com ---
On 6/25/2014 1:57 PM, mpolacek at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?ida612
>
> Marek Polacek <mpolacek at gcc dot gnu.org> changed:
>
>             What    |Removed                     |Added
> ----------------------------------------------------------------------------
>               Status|NEW                         |RESOLVED
>                   CC|                            |mpolacek at gcc dot gnu.org
>           Resolution|---                         |FIXED
>
> --- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
> Should be fixed.
Yes, it works now.  Thanks.