[Bug c/127308] New: gcc/genmatch.cc:1279: out of range warning from clang

[dcb314 at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127308

            Bug ID: 127308
           Summary: gcc/genmatch.cc:1279: out of range warning from clang
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Today's build of gcc trunk with clang says:

gcc/genmatch.cc:1279:38: warning: result of comparison of constant '
NOP_EXPR' (129) with expression of type 'const char' is always false
[-Wtautolog
ical-constant-out-of-range-compare]

Source code is

     if (*id == CONVERT_EXPR || *id == NOP_EXPR)

I guess chars are signed. git blame says:

d3481fc3f874 gcc/genmatch.cc (Andrea Pinski       2026-08-16 22:48:14 -0700
1279)       if (*id == CONVERT_EXPR || *id == NOP_EXPR)