[LyX/master] Rerun makeindex if all nomencl entries have been removed (#8905)

[Juergen Spitzmueller]

commit 027b5dc4af02675997bacc607622032918f62261
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Mon Dec 2 14:35:42 2013 +0100

    Rerun makeindex if all nomencl entries have been removed (#8905)

diff --git a/src/LaTeX.cpp b/src/LaTeX.cpp
index 22a3a97..294f09e 100644
--- a/src/LaTeX.cpp
+++ b/src/LaTeX.cpp
@@ -268,7 +268,12 @@ int LaTeX::run(TeXErrors & terr)
                                runparams);
        }
        FileName const nlofile(changeExtension(file.absFileName(), ".nlo"));
-       if (head.haschanged(nlofile))
+       // If all nomencl entries are removed, nomencl writes an empty nlo file.
+       // DepTable::hasChanged() returns false in this case, since it does not
+       // distinguish empty files from non-existing files. This is why we need
+       // the extra checks here (to trigger a rerun). Cf. discussions in #8905.
+       // FIXME: Sort out the real problem in DepTable.
+       if (head.haschanged(nlofile) || (nlofile.exists() && 
nlofile.isFileEmpty()))
                rerun |= runMakeIndexNomencl(file, ".nlo", ".nls");
        FileName const glofile(changeExtension(file.absFileName(), ".glo"));
        if (head.haschanged(glofile))