[Pkg-octave-devel] Bug#383149: Found the cause.

John Dalton john.dalton at bigfoot.com
Thu Aug 17 11:53:35 UTC 2006

I've got a program called OpenFOAM installed.  It's
a bit of a yukky program in that it sets some environment
variables in ~/.bashrc.  Consequently the environment of my
login shell looks like:

{lots of stuff deleted}

When mkoctfile evaluates CXXFLAGS and CXX, it sees the values
from my shell environment, not the values being set within
mkoctfile (CXX="/usr/bin/g++" and CXXFLAGS="-O2")

That explains the weird appearance of g++ and -m32.

Is it correct that existing values in the shell environment should 
override the default values within mkoctfile?  Is there a reason
mkoctfile reads
: ${LD_CXX="/usr/bin/g++"}
instead of

I don't really understand what
: ${variable="value"}
is doing.  Can someone please explain it to me?

I guess one solution is for me to remove the
variables from my environment, but is this
behaviour that the authors of mkoctfile intended?

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