[llvm-bugs] [Bug 42360] New: MachOReader breaks strict-aliasing rules

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jun 21 22:57:56 PDT 2019


            Bug ID: 42360
           Summary: MachOReader breaks strict-aliasing rules
           Product: tools
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-objcopy/strip
          Assignee: unassignedbugs at nondot.org
          Reporter: nuta at seiya.me
                CC: alexander.v.shaposhnikov at gmail.com,
                    jake.h.ehrlich at gmail.com,
                    jh7370.2008 at my.bristol.ac.uk,
                    llvm-bugs at lists.llvm.org, rupprecht at google.com

According to Denis Bakhvalov [1], gcc warns a string-aliasing violation in

llvm/tools/llvm-objcopy/MachO/MachOReader.cpp:124:46: required from here
llvm/tools/llvm-objcopy/MachO/MachOReader.cpp:104:19: warning: dereferencing
type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]

I managed to reproduce the problem but in my environment (gcc 7.4.0 and 5.5.0
on Linux) gcc doesn't print such a warning.

Could someone else try this?


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