[llvm-bugs] [Bug 41467] New: -Wformat warnings for integer widening are too strict

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41467

            Bug ID: 41467
           Summary: -Wformat warnings for integer widening are too strict
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk, srhines at google.com

>From this LKML discussion: https://lkml.org/lkml/2019/4/11/639.

Simple patches for fixing -Wformat warnings in the Linux kernel are getting
rejected in cases where they warn about the format of a shorter integer using a
larger integer's format flag in cases where the shorter integer would undergo
standard C integer promotion when passed to printf-like functions.

This is making it difficult to enable a warning that generally helps catch more
nonsensical conversions.  Is there maybe a way to create another -Wformat-less
strict flag that doesn't warn for integer widening like -Wformat, or create
-Wformat-pedantic which does warn on integer widening and remove warning on
that case in -Wformat?

https://github.com/ClangBuiltLinux/linux/issues/378

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