I got an email at work today, which had a couple lines of g++ calls, which Outlook displayed to me like this:
g++ -o exe1 -DXYZ=abc maintemplate.cpp test001.cpp -o exe2 -DXYZ=def g++ maintemplate.cpp test002.cpp
Turns out, this was because it "removed extra linebreaks" (which works fine most of the time, but its terrible in some cases). The original was:
g++ -o exe1 -DXYZ=abc maintemplate.cpp test001.cpp g++ -o exe2 -DXYZ=def maintemplate.cpp test002.cpp
Sigh. I guess it tries to recognized common prefixes or something.