Build problem

[Elvanör]

I get the following error while trying to build on Gentoo:

gmcs -noconfig -codepage:utf8 -warn:3 -optimize+ -out:bin/Release/Basenji.exe -target:winexe './src/Gui/About.cs' './src/Gui/DBProperties.cs' './src/Gui/DriveSelection.cs' './src/Gui/Events.cs' './src/Gui/ItemSearch.cs' './src/Gui/MainWindow.cs' './src/Gui/Preferences.cs' './src/Gui/VolumeProperties.cs' './src/Gui/VolumeScanner.cs' './src/Gui/Base/BinBase.cs' './src/Gui/Base/DialogBase.cs' './src/Gui/Base/ViewBase.cs' './src/Gui/Base/WindowBase.cs' './src/Gui/Widgets/DateChooser.cs' './src/Gui/Widgets/FSVolumeEdit.cs' './src/Gui/Widgets/ItemInfo.cs' './src/Gui/Widgets/ItemView.cs' './src/Gui/Widgets/Led.cs' './src/Gui/Widgets/SearchResultView.cs' './src/Gui/Widgets/VolumeEdit.cs' './src/Gui/Widgets/VolumeView.cs' './src/Icons/CustomIconTheme.cs' './src/Icons/Icon.cs' './src/Icons/IconCache.cs' './src/Icons/IconUtils.cs' './src/Icons/ItemIcons.cs' './src/Icons/MimeIconCache.cs' './src/Icons/NameInCustomIconThemeAttribute.cs' './src/App.cs' './src/AssemblyInfo.cs' './src/PathUtil.cs' './src/FileDialog.cs' './src/Main.cs' './src/MsgDialog.cs' './src/Settings.cs' './src/Util.cs' './src/S.cs' './src/Gui/Widgets/CategoryView.cs' './src/Gui/Widgets/PageNavigation.cs' './src/Gui/Widgets/VolumeEditEvents.cs' './src/Gui/Widgets/PageNavigationEvents.cs' './src/Gui/Widgets/IconEntry.cs' './src/Gui/Widgets/SearchEntry.cs' './src/Gui/Widgets/ItemPreview.cs' './src/Gui/Import.cs' './src/Gui/Widgets/AudioCdVolumeEdit.cs' './src/Icons/CustomIconThemeMimeMapping.cs' './src/MimeCategoryMapping.cs' '-resource:./images/LED_Off.png,Basenji.images.LED_Off.png' '-resource:./images/LED_On.png,Basenji.images.LED_On.png' '-resource:./po/de.resources,Basenji.po.de.resources' '-resource:./po/he.resources,Basenji.po.he.resources' '-resource:./po/da.resources,Basenji.po.da.resources' '-resource:./images/search.png,Basenji.images.search.png' '-resource:./po/es.resources,Basenji.po.es.resources' '-resource:./po/fr.resources,Basenji.po.fr.resources' '-resource:./po/ru.resources,Basenji.po.ru.resources' -r:System -pkg:gtk-sharp-2.0 -pkg:glib-sharp-2.0 -pkg:mono-cairo -r:System.Core -r:../Platform/bin/Release/Platform.dll -r:../VolumeDB/bin/Release/VolumeDB.dll
./src/Gui/Widgets/VolumeEdit.cs(89,29): warning CS0108: `Basenji.Gui.Widgets.VolumeEdit.Sensitive' hides inherited member `Gtk.Widget.Sensitive'. Use the new keyword if hiding was intended
/usr/lib/mono/gac/gtk-sharp/2.12.0.0__35e10195dab3c99f/gtk-sharp.dll (Location of the symbol related to previous warning)
./src/Gui/Widgets/Led.cs(42,29): warning CS0108: `Basenji.Gui.Widgets.Led.State' hides inherited member `Gtk.Widget.State'. Use the new keyword if hiding was intended
/usr/lib/mono/gac/gtk-sharp/2.12.0.0__35e10195dab3c99f/gtk-sharp.dll (Location of the symbol related to previous warning)
./src/Gui/MainWindow.cs(433,37): warning CS0618: `Gtk.Timeout' is obsolete: `Replaced by GLib.Timeout'
./src/Gui/MainWindow.cs(433,37): warning CS0618: `Gtk.Timeout.Add(uint, Gtk.Function)' is obsolete: `Replaced by GLib.Timeout.Add'
./src/Gui/Widgets/VolumeEdit.cs(80,41): warning CS0162: Unreachable code detected
./src/Gui/Widgets/VolumeEdit.cs(83,41): warning CS0162: Unreachable code detected
./src/Gui/Widgets/ItemInfo.cs(407,65): warning CS0612: `Gtk.Widget.Flags' is obsolete
./src/Gui/Widgets/ItemInfo.cs(407,45): warning CS0612: `Gtk.Widget.Flags' is obsolete
./src/Gui/Widgets/ItemInfo.cs(433,25): error CS0029: Cannot implicitly convert type `Cairo.Context' to `Cairo.Context'
./src/Gui/Widgets/ItemInfo.cs(433,25): The type `Cairo.Context' has two conflicting definitions, one comes from `Mono.Cairo, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756' and the other from `Mono.Cairo, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756' (in the previous error)
Internal(1,1): The type `Cairo.Context' has two conflicting definitions, one comes from `Mono.Cairo, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756' and the other from `Mono.Cairo, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756' (in the previous error)
Compilation failed: 1 error(s), 8 warnings
make[1]: *** [bin/Release/Basenji.exe] Error 1
make[1]: Leaving directory `/home/elvanor/Desktop/basenji-0.6.1/Basenji'
make: *** [all-recursive] Error 1

I am using Mono 2.6.x. I don't know what's pulling Mono.Cairo v2 (apparently gtk-sharp and other dependencies all pull v1, but I am not a Mono / .NET programmer).

With help from some people on #mono, I found a workaround:

replace -pkg:mono-cairo by -r:Mono.Cairo in the Makefile.

With that, basenji builds fine and runs well 9(entoo has all the needed dependencies packaged). I'd like to integrate Basenji in the Gentoo tree (I am a Gentoo dev) but first this problem should be fixed upstream.

[Patrick Ulbrich (pulb)]

Hi, thanks for your bugreport.

I wonder what pulls in the cairo 1.0 dependency since I explicitly link against 2.0 only.
I had the same issue on ubuntu some time ago, it's probably a pgkconfig issue.
Can you verify if there are two pkgconfig files for both, mono-cairo 1.0 and 2.0 on you system?
I only have /usr/lib/pkgconfig/mono-cairo.pc which pulls in the 2.0 dependency as it should.
Please also check the output of the following commands and see if those make use of the 1.0 dependency:
pkg-config --libs gtk-sharp-2.0.pc
pkg-config --libs glib-sharp-2.0

Thanks for your packaging support!

[Patrick Ulbrich (pulb)]

Since the build failure appears to be caused by a mono/cairo-cil packaging issue specific to gentoo, I mark this bug as invalid.
Please feel free to reopen if it turns out otherwise.

[Elvanör (elvanor)]

Hello, I got the time to look at the issue today. The /usr/lib/pkgconfig/mono-cairo.pc points to the 1.0 dependency so I guess the problem comes from this. I am going to report this to Gentoo's Mono packagers. Thanks for the help, and keep up the good work.