[Bug default/23533] New: abidiff is confused when an "=" sign is used in a suppression label

["bochecha at daitauha dot fr" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23533

            Bug ID: 23533
           Summary: abidiff is confused when an "=" sign is used in a
                    suppression label
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: bochecha at daitauha dot fr
                CC: libabigail at sourceware dot org
  Target Milestone: ---

Because of https://sourceware.org/bugzilla/show_bug.cgi?id=23492, I have to
ignore libgfortran, so I used the following suppression file:

  [suppress_file]
  # https://sourceware.org/bugzilla/show_bug.cgi?id=23492
  label = Libabigail can't handle libgfortran.so
  file_name_regexp = libgfortran\\.so.*

This works just fine.

However, if I put the bug URL in the label, as I originally wanted to, then
abidiff will skip the suppression rule, and NOT ignore the file.

I found that this is due to the "=" sign in the bug URL, which seems to confuse
the INI parser somehow. It probably can't correctly parse the key/value.

I tried quoting the string, but that didn't change anything, those all lead to
the same behaviour:

  label = https://sourceware.org/bugzilla/show_bug.cgi?id=23492
  label = 'https://sourceware.org/bugzilla/show_bug.cgi?id=23492'
  label = "https://sourceware.org/bugzilla/show_bug.cgi?id=23492"

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