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