The approach I'm taking for the tinderbox is to not use any special optimisation flag in it, even though I could use it to test stuff that can get tricky, such as @-ftracer@. It is important to note that it doesn't even set any particular architecture, meaning that the compiler is told to use the...
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I'm a FLOSS developer and supported, and a somewhat active blogger. I also wrote Autotools Mythbuster to explain good working practices with autoconf and automake.