[Bug 239328] devel/gettext-tools: msgmerge --for-msgfmt doesn't produce an output file if the input has no translation

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239328

            Bug ID: 239328
           Summary: devel/gettext-tools: msgmerge --for-msgfmt doesn't
                    produce an output file if the input has no translation
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: tijl at FreeBSD.org
          Reporter: lantw44 at gmail.com
             Flags: maintainer-feedback?(tijl at FreeBSD.org)
          Assignee: tijl at FreeBSD.org

Created attachment 205916
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=205916&action=edit
Fix msgmerge --for-msgfmt bug

This is a bug which is already fixed by upstream:
https://lists.gnu.org/archive/html/bug-gettext/2019-05/msg00124.html

After updating to gettext 0.20, 'msgmerge --for-msgfmt' stops producing an
output file if it decides that the output file will be empty. This causes
'msgfmt' to fail because it can't find the file produced by 'msgmerge'. Since
the bug has already been fixed by upstream, can we add the patch to the port?

Currently this bug causes libgtop and gcr to fail to build from upstream git:

cd /home/lantw44/gnome/source/libgtop/po && rm -f mi.gmo &&
/usr/local/bin/msgmerge --for-msgfmt -o mi.1po mi.po libgtop.pot &&
/usr/local/bin/msgfmt -c --statistics --verbose -o mi.gmo mi.1po && rm -f
mi.1po
/usr/local/bin/msgfmt: error while opening "mi.1po" for reading: No such file
or directory

cd /home/lantw44/gnome/source/gcr/po && rm -f az.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o az.1po az.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o az.gmo az.1po && rm -f az.1po
/usr/local/bin/msgfmt: error while opening "az.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f cy.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o cy.1po cy.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o cy.gmo cy.1po && rm -f cy.1po
/usr/local/bin/msgfmt: error while opening "cy.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f en_CA.gmo &&
/usr/local/bin/msgmerge --for-msgfmt -o en_CA.1po en_CA.po gcr.pot &&
/usr/local/bin/msgfmt -c --statistics --verbose -o en_CA.gmo en_CA.1po && rm -f
en_CA.1po
/usr/local/bin/msgfmt: error while opening "en_CA.1po" for reading: No such
file or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f is.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o is.1po is.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o is.gmo is.1po && rm -f is.1po
/usr/local/bin/msgfmt: error while opening "is.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f ka.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o ka.1po ka.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o ka.gmo ka.1po && rm -f ka.1po
/usr/local/bin/msgfmt: error while opening "ka.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f mg.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o mg.1po mg.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o mg.gmo mg.1po && rm -f mg.1po
/usr/local/bin/msgfmt: error while opening "mg.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f mn.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o mn.1po mn.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o mn.gmo mn.1po && rm -f mn.1po
/usr/local/bin/msgfmt: error while opening "mn.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f rw.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o rw.1po rw.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o rw.gmo rw.1po && rm -f rw.1po
/usr/local/bin/msgfmt: error while opening "rw.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f si.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o si.1po si.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o si.gmo si.1po && rm -f si.1po
/usr/local/bin/msgfmt: error while opening "si.1po" for reading: No such file
or directory
cd /home/lantw44/gnome/source/gcr/po && rm -f xh.gmo && /usr/local/bin/msgmerge
--for-msgfmt -o xh.1po xh.po gcr.pot && /usr/local/bin/msgfmt -c --statistics
--verbose -o xh.gmo xh.1po && rm -f xh.1po
/usr/local/bin/msgfmt: error while opening "xh.1po" for reading: No such file
or directory

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