[Bug c++/56658] New: Silent conversion between 'char' and 'int' even though there are 'signed char' and 'unsigned char' alternatives

[greenscape777 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56658

             Bug #: 56658
           Summary: Silent conversion between 'char' and 'int' even though
                    there are 'signed char' and 'unsigned char'
                    alternatives
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: greenscape777@gmail.com


Consider code snippet:

#include <stdio.h>

typedef signed char int8_t;
typedef unsigned char uint8_t;

void foo(int8_t x)
{
    printf("Cartman");
}

void foo(uint8_t x)
{
    printf("Stan");
}

void foo(int x)
{
    printf("Kenny");
}

int main(int argc, char ** argv)
{
    char    person = '?';

    printf("Oh my God they killed ");
    foo(person);
    printf("! You bastards!\n");
}


It does compile and generate 0 warnings. Yes, we all know how 'wise' was former
creators of the standard when it came to char. But in this case, if compiler
can't figure out 'char' is 'signed char' there is still an ambiguity. And
silent conversion of 'char' to 'int' is just wrong. As far as I can judge,
clang guys just pathetically copy-pasted GCC's behavior. What I ask for is at
least warning message there.