[llvm-bugs] [Bug 39152] New: Improve error message for invalid --dump-section syntax

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39152

            Bug ID: 39152
           Summary: Improve error message for invalid --dump-section
                    syntax
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-objcopy
          Assignee: unassignedbugs at nondot.org
          Reporter: jh7370.2008 at my.bristol.ac.uk
                CC: llvm-bugs at lists.llvm.org

Currently, if you forget to provide llvm-objcopy with an output file for
--dump-section, you get a rather confusing output message, at least on Windows:

C:\Work\TempWork> C:\llvm\build\Debug\bin\llvm-objcopy --dump-section=.text
bar.o bar2.o
C:\llvm\build\Debug\bin\llvm-objcopy.exe: error: 'bar.o': The program issued a
command but the command length is incorrect

It would be better if we detected the missing filename earlier (i.e. when we
split the option on '='), and emitted a more coherent error message, indicating
what was wrong.

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