Gcc-7 help needed to upgrade r-cran-igraph

[Andreas Tille <andreas@an3as.eu>]

Hi

I intended to upgrade r-cran-igraph[1] to the latest upstream version
but I stumbled upon a strange issue where a #define statement seems to
be ignored by the C prepocessor.  At first I assumed that some printf
format statement would be the cause which I tried to fix in a patch[2]
but it seems that rather the 

    #define GRAPHML_NAMESPACE_URI "http://graphml.graphdrawing.org/xmlns";

in the file src/foreign-graphml.c is ignored and makes the code fail.

Any idea what might be wrong here?

Kind regards

         Andreas.


[1] https://anonscm.debian.org/git/debian-med/r-cran-igraph.git
[2] https://anonscm.debian.org/git/debian-med/r-cran-igraph.git/tree/debian/patches/gcc-7.patch

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