On 2016-08-07 03:34 PM, D. Hugh Redelmeier via talk wrote:
I'm still playing with this, but here are my preliminary observations.
Wow, thanks, Hugh - this is definitely the definition of going above and beyond!
So here's the fundamental problem.
"exp" is kind of like a reserved word in C. It is the exponential function and is declared in math.h.
logo.h has #define exp expresn
This screws up math.h.
I initially thought “How can C possibly allow that?” — then I remember that C basically allows everything. So what we have here is a kind of internal bitrot: the code doesn't change, but the standards of the language do, so it won't build.
Fix? Several, but untested. …
Thank you. I'll definitely try the simpler ones. Don't think the glibc ones are within my grasp. You'd previously asked why I wasn't using the distro-supplied versions. True enough: Ubuntu has a packaged UCB Logo 5.5 archive that installs and runs easily enough. Unfortunately, it's not fit for my purposes. I'm using Logo to generate construction frameworks for decorative patterns*. I dunno what 5.5 is built on top of, but its PostScript output is a mess of unnecessary nodes. The newer interpreter has a completely rewritten graphics system on top of wxWidgets, and its output is very clean. Yeah, I should probably do this using Python's turtle module, as it makes some nice output and is actually maintained. Logo, however, encourages a much more interactive development style. cheers, Stewart *: like this - cs pd repeat 10 [ rt 54 fd 43.865 lt 90 fd 45.002 lt 108 fd 45.002 lt 90 fd 43.865 lt 90 ] pu ht