[Bug c++/29188] New: accepts-invalid ambiguous between conversion function/constructor. related to const

[greifel at megatop200 dot com]

g++ release 4.1.1 compiles the following invalid code without detecting an
error.
It does correctly find the error with -pedantic. Interestingly (perhaps), it
also correctly detects the ambiguous call where the argument involved is const
- as demonstrated by the second compilation below with the macro C2 defined:

sjh@mill:~/c++/compiler$ g++ -c conversion.ambig.c
sjh@mill:~/c++/compiler$ cat conversion.ambig.c
class Source;

class Destination
{
public:
Destination() {}
Destination (const Source& source) {}
};

class Source
{
public:
Source() {}
operator Destination() const { return Destination();}
};

Source source;
Destination wolf =  source; // ambiguous

#ifdef C2
const Source source2;
Destination wolf2 =  source2; // ambiguous
#endif
sjh@mill:~/c++/compiler$ g++ -D C2 conversion.ambig.c
conversion.ambig.c:22: error: conversion from 'const Source' to 'Destination'
is ambiguous
conversion.ambig.c:14: note: candidates are: Source::operator Destination()
const
conversion.ambig.c:7: note:                 Destination::Destination(const
Source&)
sjh@mill:~/c++/compiler$
sjh@mill:~/c++/compiler$
sjh@mill:~/c++/compiler$ gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: /home/sjh/gcc/gcc-4.1.1/configure
--prefix=/home/sjh/gcc/prefix/ --enable-languages=c,c++
Thread model: posix
gcc version 4.1.1
sjh@mill:~/c++/compiler$


-- 
           Summary: accepts-invalid ambiguous between conversion
                    function/constructor. related to const
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: greifel at megatop200 dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29188