[Bug middle-end/77721] -Wformat-truncation not uses arg range for converted vars

[dimhen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77721

--- Comment #7 from Dmitry G. Dyachenko <dimhen at gmail dot com> ---
Sounds like gcc-8.0.1 PASS for me

r257061 FAIL
r258034 PASS
r12-5546 PASS

$ ~/arch-gcc/SVN/gcc_258034/bin/gcc --version
gcc (GCC) 8.0.1 20180227 (experimental) [trunk revision 258034]

$ ~/arch-gcc/SVN/gcc_258034/bin/gcc -O2 -S -Wall -Woverflow -Wconversion
-Wpedantic -Wformat-truncation=2 -xc x.c

$ cat x.c
int snprintf (char*, __SIZE_TYPE__, const char*, ...);

void foo(unsigned j, char *p)
{
    if(j > 999)
        return;
    snprintf(p, 4, "%3u", j);
}

void bar(int j, char *p)
{
    const unsigned k = (unsigned) j;
    if(k > 999)
        return;
    snprintf(p, 4, "%3u", k);
}