Thanks for the feedback folks. I backed everything up, made install, and verified that nothing was done outside of the "prefix-directory" specified. And the darnedest thing seems to actually work fine!
In my code, I only had to fix some "specialized template stuff" (guess C++ or g++'s level of sloppiness has changed since 3.4.2) and then some 160.000+ lines of C/C++-code compiled, with my test program running in 71% of the time that the 3.4.2-compiled version did! Exactly the kind of effect I was looking for...! (This code is heavy on math and STL stuff, -O3 plus some other options used.)
J.O.
PS. Didn't apply any patches at all.
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