[Rd] Clash between 'Cairo' and 'EBImage' packages on Windows

[Sklyar, Oleg (London)]

EBImage is dynamically linked against GTK, which includes cairo
libraries, so those are installed along with GTK. Cairo seems to be
statically linking to libcairo.dll.a. I would assume that if it is
linked statically it should not get confused with a shared library
present elsewhere in the path, but it looks like it does. I have no
solution for that because unlike Cairo I cannot not statically link
EBImage to GTK as it is not one library that I need, but a bunch of
those.

On Linux you won't get this problem as it uses the same centrally
installed Cairo library.

In a way it would be better, if Cairo relied on the gladewin32.sf.net
which normally provides GTK (and thus cairo libraries) for Windows and
linked dynamically, but probably to simplify user installations the
developers wanted to avoid this.

There is not much I can do now about this, but I will follow the thread
if anybody comes up with an idea to change the code if possible

Dr Oleg Sklyar
Technology Group
Man Investments Ltd
+44 (0)20 7144 3803
osklyar at maninvestments.com 

> -----Original Message-----
> From: r-devel-bounces at r-project.org 
> [mailto:r-devel-bounces at r-project.org] On Behalf Of Henrik Bengtsson
> Sent: 19 July 2008 19:26
> To: R-devel
> Subject: [Rd] Clash between 'Cairo' and 'EBImage' packages on Windows
> 
> Hi,
> 
> on Windows XP Pro with R version 2.7.1 Patched (2008-06-27 
> r46012) the 'Cairo' and the 'EBImage' packages does not play 
> well together.
> 
> Loading EBImage before Cairo cause the following to happen:
> 
> # Rterm --vanilla
> > library(EBImage);
> > library(Cairo)
> Error in inDL(x, as.logical(local), as.logical(now), ...) :
>   unable to load shared library 
> 'C:/PROGRA~1/R/R-2.7.1pat/library/Cairo/libs/Cai
> ro.dll':
>   LoadLibrary failure:  The specified procedure could not be found.
> 
> Error : .onLoad failed in 'loadNamespace' for 'Cairo'
> Error: package/namespace load failed for 'Cairo'
> 
> with a dialog titled 'Rterm.exe - Entry Point Not Found' 
> saying 'The procedure entry point cairo_pdf_surface_create 
> could not be located in the dynamic link library libcairo-2.dll'.
> 
> Loading the packages in the reverse order works, but the 
> Rterm seems unstable, e.g. calling q() immediately after will 
> exit the R session without questions:
> 
> # Rterm --vanilla
> > library(Cairo)
> > library(EBImage)
> > q()
> [Immediately back to the command line].
> 
> I cannot reproduce the problem on R v2.7.1 on Ubuntu Hardy.
> 
> > sessionInfo()
> R version 2.7.1 Patched (2008-06-27 r46012)
> i386-pc-mingw32
> 
> locale:
> LC_COLLATE=English_United States.1252;LC_CTYPE=English_United 
> States.1252;LC_MON ETARY=English_United 
> States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
> 
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
> 
> other attached packages:
> [1] EBImage_2.4.0 Cairo_1.4-2
> 
> Cheers
> 
> Henrik
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
> 


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