[llvm-bugs] [Bug 45416] New: Emit a more useful error for invalid --dump-section syntax

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45416

            Bug ID: 45416
           Summary: Emit a more useful error for invalid --dump-section
                    syntax
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          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

If a user uses the --dump-section option, but it specifies it incorrectly, as
in the example below, without a '=' sign, a rather useless error message is
produced (at least on Windows):

C:\Work> llvm-objcopy t.elf t.out --dump-section .text
llvm-objcopy.exe: error: 't.elf': The program issued a command but the command
length is incorrect.

We should add some error checking to this option to ensure the format is
correct, i.e. that the file name is not empty, and that there's an equals sign
splitting it from the section name.

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