[gecode-users] Compile gecode for 32-bit under Linux

[Alexander Schuppisser]

Hi,

I'd like to compare the performance of a 64-bit version of fzn-gecode to
a 32-bit-version unter Linux (Ubuntu 16.04 or 14.04) for a certain
problem. But I could not crosscompile it.

I know that it's possible, because in the Minizinc IDE is a fzn-gecode
for 32 bit. But this version has dependencies to Qt (which I don't have
running it on a server). That's how I compile what I need on 64 bit:

static:

export PREFIX="/home/nath/apps/gecode-5.0.0"
./configure \
  --prefix="$PREFIX" --enable-float-vars=no --enable-examples=no --enable-qt=no --enable-gist=no --enable-doc-dot=no \
  --enable-doc-tagfile=no --enable-driver=no --enable-examples=no --enable-scheduling=no --enable-graph=no --enable-minimodel=no \
  --enable-static --disable-shared

shared:

export PREFIX="/home/nath/apps/gecode-5.0.0"
CFLAGS="-Wl,-rpath,$PREFIX/lib" CXXFLAGS="-Wl,-rpath,$PREFIX/lib" \
   ./configure \
  --prefix="$PREFIX" --enable-float-vars=no --enable-examples=no --enable-qt=no --enable-gist=no --enable-doc-dot=no \
  --enable-doc-tagfile=no --enable-driver=no --enable-examples=no --enable-scheduling=no --enable-graph=no --enable-minimodel=no

Now what to cange / add to get a 32-bit binary in the end?

I tried a lot of things with Flags and setting env-Variables before
compiling found as general tips for cross compiling, but nothing worked
for fzn-gecode. What do I need to do?

Thank you

Alexander

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