it linked and even ran, but no faster than the code compiled by gcc-7
gcc took 20mins to compile it all on my dual core laptop, clang over 10x as long, and gcc output is marginally faster in one simple test.
I think I'll punt these compiler changes to a future `kf-2.15` branch, the generated code for reference and perturbation iterations is just not good enough yet.
Would be nice though, adding a formula would become 2 lines of code, and the huge formula.cpp generated from the semi-automatically crafted formula.xml via formua.xsl takes a long time to compile, at least the generated code is split into many files so it can be compiled in parallel...
Hopefully will manage to release `kf-2.14.4` today with some less invasive changes.