I can make a pull request, I'm pretty sure the appropriate fix is indeed the correct fix. I think it'd be important to test the implementations of atan, asin, acos, fmax and fmin to make sure all is well. LinuxCNC will report errors if any of the math is wrong, yes? Say for example the accuracy of atan is off by a few decimal points, how will the user know if there's a problem? I'm fairly certain this will be a non-issue but I just want to make sure switching from GNU89 to GNU11 doesn't come with any regressions.
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