I am having a problem using two DLLs with the same name, but obviously
located in different directories, in an R session. The troublesome
package is the (Bioconductor) Rgraphviz package. It relies on (3rd party
software) graphviz and imports functions from (Bioconductor) package
graph. Unfortunately, the current stable release of graphviz for Windows
http://www.graphviz.org/pub/graphviz/stable/windows/graphviz-2.22.2.msi
contains a graph.dll in its bin directory. The situation is that
Rgraphviz needs to link to the graph.dll from graphviz,
E:\paboyoun>..\biocbld\bbs-2.4-bioc\R\bin\R CMD build Rgraphviz
[...omitting output...]
** libs
making DLL ...
[...omitting output...]
gcc -shared -s -o Rgraphviz.dll tmp.def LL_funcs.o Rgraphviz.o
RgraphvizInit.o agopen.o agread.o agwr
ite.o bezier.o buildEdgeList.o buildNodeList.o doLayout.o
graphvizVersion.o init.o -LC:/Graphviz2.22/
bin -lgvc -lgraph -lcdt -Le:/biocbld/bbs-2.4-bioc/R/bin -lR
[...omitting output...]
but at run time R dispatches to the graph.dll from the graph package to
resolve the symbols.
R-2.9> Sys.which("graph.dll")
graph.dll
"C:\\GRAPHV~1.22\\bin\\graph.dll"
R-2.9> library(Rgraphviz)
Loading required package: graph
Loading required package: grid
<< Message box appears: The procedure entry point agclose could not be
located in the dynamic link library graph.dll >>
Running Rterm.exe through the DependencyWalker software, I see that the
gvc.dll and cdt.dll graphviz libraries are properly loaded, but the
graph.dll dependency of Rgraphviz.dll links to the graph.dll library
from the graph package. I tried passing the DLLpath for graphviz to the
library.dynam function call when loading Rgraphviz.dll in the .onLoad
function within Rgraphviz and it had no effect. I also tried
library.dynam.unload/dyn.unload-ing the graph.dll from the graph package
and then loading the Rgraphviz.dll followed by the reloading of the
graph.dll from the graph package and the graph.dll dependencies become
broken to the point that a call out to a graph.dll results in a GPF.
Is is possible to manage DLLs with the same name from R or do I need to
rename one of the DLL names to make them unique?
> sessionInfo()
R version 2.9.0 (2009-04-17)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] grid stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] graph_1.22.0
loaded via a namespace (and not attached):
[1] cluster_1.11.13 tools_2.9.0
Patrick
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