Building on Mac OS X (Darwin)

seems to work and run but when I try most of the tests it seems to
fail with a bus error

For example (geomath) edit run.py to work with my local paths

geomath]$./run.py
test.osl:0: warning: Unable to find "/usr/shaders"
sh: line 1: 31148 Bus error               testshade -g 2 2 test >>
out.txt
FAIL

however out.txt

Compiled test.osl -> test.oso
   hypot (3, 4) = 5
   hypot (3, 4, 5) = 7.07107
   reflect (0.447214 -0.894427 0, 0 1 0) =  0.447214 0.894427 0
   reflect (0.447214 -0.894427 0, -1 0 0) =  -0.447214 -0.894427 0
 testing total-internal reflection:
   refract (0.707107 -0.707107 0, 0 1 0, 1.42) =  0 0 0
   frensel:  Kr= 1  Kt = 0  R = 0.707107 0.707107 0  T = 0 0 0
 testing regular refraction:
   refract (-0.436436 -0.218218 -0.872872, 0.267261 0.534522 0.801784,
0.862069) =  -0.415346 -0.266336 -0.869801
   --> verify refract():  1/1.16 = sin(18.0549)/sin(21.0705) =>
0.862069 ?= 0.862068
   fresnel:  Kr= 0.00557254  Kt = 0.739022  R = 0.0623479 0.779349
0.623479  T = -0.415346 -0.266336 -0.869801
   --> verify fresnel():  1/1.16 = sin(18.0549)/sin(21.0705) =>
0.862069 ?= 0.862068
 Varying:
   hypot (0, 0) = 0
   hypot (1, 0) = 1
   hypot (0, 1) = 1
   hypot (1, 1) = 1.41421
   hypot (0, 0, 0) = 0
   hypot (1, 0, 1) = 1.41421
   hypot (0, 1, 1) = 1.41421
   hypot (1, 1, 2) = 2.44949
   reflect (0 -1 0, 0 1 0) =  0 1 0
   reflect (0.447214 -0.894427 0, 0 1 0) =  0.447214 0.894427 0
   reflect (0 -1 0, 0.707107 0.707107 0) =  1 -5.96046e-08 0
   reflect (0.447214 -0.894427 0, 0.707107 0.707107 0) =  0.894427
-0.447214 0
   refract (0.408248 -0.408248 -0.816497, 0 0 1, 0.75188) =  0.306954
-0.306954 -0.900866
   refract (0.801784 -0.267261 -0.534522, 0 0 1, 0.75188) =  0.602845
-0.200948 -0.772138
   refract (0.408248 0.408248 -0.816497, 0 0 1, 0.75188) =  0.306954
0.306954 -0.900866
   refract (0.801784 0.267261 -0.534522, 0 0 1, 0.75188) =  0.602845
0.200948 -0.772138
   --> verify refract():  1/1.33 = sin(25.7279)/sin(35.2644) =>
0.75188 ?= 0.75188
   --> verify refract():  1/1.33 = sin(39.4537)/sin(57.6885) =>
0.75188 ?= 0.75188
   --> verify refract():  1/1.33 = sin(25.7279)/sin(35.2644) =>
0.75188 ?= 0.75188
   --> verify refract():  1/1.33 = sin(39.4537)/sin(57.6885) =>
0.75188 ?= 0.75188
   fresnel() -> Kr= 0.0222824  Kt = 0.552726  R = 0 0 0  T = 0.306954
-0.306954 -0.900866
   fresnel() -> Kr= 0.0505776  Kt = 0.53673  R = 0 0 0  T = 0.602845
-0.200948 -0.772138
   fresnel() -> Kr= 0.0222824  Kt = 0.552726  R = 0 0 0  T = 0.306954
0.306954 -0.900866
   fresnel() -> Kr= 0.0505776  Kt = 0.53673  R = 0 0 0  T = 0.602845
0.200948 -0.772138
   --> verify fresnel():  1/1.33 = sin(25.7279)/sin(35.2644) =>
0.75188 ?= 0.75188
   --> verify fresnel():  1/1.33 = sin(39.4537)/sin(57.6885) =>
0.75188 ?= 0.75188
   --> verify fresnel():  1/1.33 = sin(25.7279)/sin(35.2644) =>
0.75188 ?= 0.75188
   --> verify fresnel():  1/1.33 = sin(39.4537)/sin(57.6885) =>
0.75188 ?= 0.75188

which is the same as the ref

Also had to do a couple of hacks in the oiio ivgl.cpp file to cast the
std::max and std::clamp functions to get it all to compile

I will play with the rest of the tests and see what happens

Cheers

Jon