[Octave-bug-tracker] [bug #51680] some LDFLAGS variables may be a space instead of empty string, throwing off other tests

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?51680>

                 Summary: some LDFLAGS variables may be a space instead of
empty string, throwing off other tests
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Sun 06 Aug 2017 09:12:19 PM PDT
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Installation Failure
                  Status: In Progress
             Assigned to: mtmiller
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: GNU/Linux

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Details:

On Ubuntu 14.04, I find that some pkg-config commands may return what appears
to be an empty string, but is actually a space character. There are other
tests in configure and possibly elsewhere in the code base that test for empty
strings, for example


if test -n "$QT_LDFLAGS"; then
...


which is breaking the build configuration further down the line, for example
the set of library dependencies that are encoded in mkoctfile.

I'm working on a workaround for this that I can apply as a patch to the 4.2.1
release, and will post again when I get something working.




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