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}
CXXFLAGS=-m32
CXX=g++
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
LD_CXX="/usr/bin/g++"
I don't really understand what
: ${variable="value"}
is doing. Can someone please explain it to me?
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