[llvm-bugs] [Bug 44283] New: --dump-section run at wrong time

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Dec 12 01:45:19 PST 2019


            Bug ID: 44283
           Summary: --dump-section run at wrong time
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-objcopy/strip
          Assignee: unassignedbugs at nondot.org
          Reporter: jh7370.2008 at my.bristol.ac.uk
                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

llvm-objcopy --dump-section is run after removing and adding of sections. This
is incorrect, since GNU objcopy runs it before. The GNU behaviour also
intuitively makes sense to me: to "extract" a section (i.e. dump and remove),
it should be one operation. However, llvm-objcopy does not allow this: if an
attempt is made to dump a section in the same invocation as it is removed,
llvm-objcopy emits an error saying the section can't be found.

Similarly, dumping a newly added section should not be allowed to match GNU
(i.e. --dump-section .data=data.txt --add-section .data=from.txt should emit an

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