This workaround is borrowed from xfconf. gtkdoc-scangobj.in compares
gint64 to gulong which causes a compiler error with -Wno-sign-compare.
An upstream bug was filed on

  http://bugzilla.gnome.org/show_bug.cgi?id=596730

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They have no effect on binaries.

They are also all prepended to the functions so they
will most likely also cause problems with the Sun compiler.

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XDT_FEATURE_VISIBILITY() breaks plugins as it strips thunar_extension*
functions from the final shared library files. An alternative way to
XDT_FEATURE_VISIBILITY() and the old visibility configure code used in
Thunar is to define -export-symbols-regex (e.g. by setting it to
"^thunar_extension.*") in Makefile.am of each plugin.

This also removes the alias stuff in Thunarx, as we no longer need to
define which symbols to export or not via the alias header. All symbols
starting with _ are now automatically marked as private and are not
exported. Additionally, G_GNUC_INTERNAL can be used to hide symbols.

thunarx.symbols is preserved for ABI checks and still has to be updated
when new symbols are added.

Hope all this is ok. Double-checkers to the rescue!

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Using strlen() for the number of characters is unrealistic when dealing
with multibyte strings.

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I'd like to see if this has an impact on make distcheck. It could be
that only modules using XDT_FEATURE_DEBUG(), like xfconf and Thunar,
break due to this error in the scanner code generated by gtk-doc:

thunarx-scan.c: In function ‘describe_signed_constant’:
thunarx-scan.c:884: error: comparison between signed and unsigned

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This reverts commit 40684e73.

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We now have startup notification support in the Thunar D-Bus interface
which adds a startup ID parameter to some of the D-Bus methods.

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