[Bug analyzer/105892] New: RFE: -fanalyzer could complain about pointer subtraction of pointers to different memory chunks

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105892

            Bug ID: 105892
           Summary: RFE: -fanalyzer could complain about pointer
                    subtraction of pointers to different memory chunks
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
            Blocks: 105887
  Target Milestone: ---

See:
  https://clang.llvm.org/docs/analyzer/checkers.html#alpha-core-pointersub-c

Seems fairly easy to implement via analyzer's region model (for "definitely
different chunks", at least); unsure what the signal:noise ratio would be like.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105887
[Bug 105887] RFE: clang analyzer warnings that GCC's -fanalyzer could implement