[Bug c/78461] New: [7 Regression] ICE: in operator+=, at gimple-ssa-sprintf.c:214

["trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78461

            Bug ID: 78461
           Summary: [7 Regression] ICE: in operator+=, at
                    gimple-ssa-sprintf.c:214
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

markus@x4 /tmp % cat dlm.i
extern int snprintf(char *s, unsigned long n, const char *format, ...);
void foo(char *ch) { snprintf(0, 0, "%.*s%08x", 1, ch, 1); }

markus@x4 /tmp % gcc -c dlm.i
dlm.i: In function ‘foo’:
dlm.i:2:6: internal compiler error: in operator+=, at gimple-ssa-sprintf.c:214
 void foo(char *ch) { snprintf(0, 0, "%.*s%08x", 1, ch, 1); }
      ^~~
0x12a98db operator+=
        ../../gcc/gcc/gimple-ssa-sprintf.c:214
0x12a98db add_bytes
        ../../gcc/gcc/gimple-ssa-sprintf.c:2119
0x12a98db compute_format_length
        ../../gcc/gcc/gimple-ssa-sprintf.c:2211
0x12a98db handle_gimple_call
        ../../gcc/gcc/gimple-ssa-sprintf.c:2775
0x12a98db execute
        ../../gcc/gcc/gimple-ssa-sprintf.c:2802