[Bug default/27595] New: dwz -o outfile with implicit file argument

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27595

            Bug ID: 27595
           Summary: dwz -o outfile with implicit file argument
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

Consider this session:
...
$ rm -f a.out b.out
$ gcc ~/hello.c -g
$ ls a.out
a.out
$ dwz -o b.out
$ ls b.out
b.out
$
...

The advertised usage looks like this:
...
$ ./dwz -?
Usage:
  ./dwz [common options] [-h] [-m COMMONFILE] [-M NAME | -r] [FILES]
  ./dwz [common options] -o OUTFILE FILE
  ./dwz [ -v | -? ]
...

But the actual dwz use we did above suggests instead:
...
  ./dwz [common options] -o OUTFILE [ FILE ]
...

So, we should either update the advertised usage, or require an explicit file
when using -o.

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