Shader Compiler bailing out with just a few shader features.

Below I pasted a minimal shader which always causes the compiler to fail even though it has just about as many shader_fearures as the standard shader.

If I count correctly there should be: 3 * 4 * 3 * 3 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 = 27648 variants ?

Further more compiler never utilizes more than 30% of the CPU (no I don't have a tri-core . At the same time there's plenty of free ram and hdd is doing literally nothing so I wonder what's preventing the compiler from running 3 times faster.

Regardless. Can I ask anyone to try and compile this shader, please?
Yes, it'll take quite some time but because it is so minimal perhaps it'll help unity to diagnose why the compilation fails and also why is it using so little of the cpu before it fails.

Win10 - 5.4.0f3; 5.4.0p1; 5.4.0p2. Didn't check older versions. Target platform: android and win x64

The errors I usually get are as follows:

Protocol error - failed to read correct magic number
or
Internal error communicating with the shader compiler process
or
Shader error in '': Parse error: syntax error at line 1 (no there's no BOM - doublechecked)

Code (csharp):

1. Shader "Custom/Dev Test" {
2.   Properties {
3.     _MainTex("Albedo", 2D) = "white" {}
4.   }
5.   SubShader {
6.     Tags { "RenderType" = "Opaque" "PerformanceChecks" = "False" }
7.     LOD 200
8.     CGPROGRAM
9.  
10.     // Protocol error - failed to read correct magic number
11.     // Internal error communicating with the shader compiler process
12.     // Shader error in '': Parse error: syntax error at line 1 (no there's no BOM - doublechecked)
13.     // no rhyme or reason
14.  
15.     #pragma target 3.0
16.     #pragma shader_feature _PPP _WWW _QQQ
17.     #pragma shader_feature _ _AAA _CCC _VVV
18.     #pragma shader_feature _ _OOO _YYY
19.     #pragma shader_feature _ _FOO _BOO
20.     #pragma shader_feature _NOTHING_OFF
21.     #pragma shader_feature _SOMETHING_OFF
22.     #pragma shader_feature _SOMEMAP
23.     #pragma shader_feature _OTHERMAP
24.     #pragma shader_feature _FEATURE_A
25.     #pragma shader_feature _FEATURE_B
26.     #pragma shader_feature _FEATURE_C
27.     #pragma shader_feature _FEATURE_D
28.  
29.     // 3 * 4 * 3 * 3 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 = 27648 variants
30.  
31.     #pragma surface surf Lambert
32.  
33.     sampler2D _MainTex;
34.  
35.     struct Input {
36.         float2 uv_MainTex;
37.     };
38.  
39.     void surf(Input IN, inout SurfaceOutput o) {
40.         o.Albedo = tex2D(_MainTex, IN.uv_MainTex);
41.     }
42.     ENDCG
43.     } // SubShader
44.  
45.     FallBack "Diffuse"
46. }

Thanks in advance.

 

So I reported this bug but it turned out to be a duplicate (oops. )

Anyone interested:

https://issuetracker.unity3d.com/is...aders-with-massive-amounts-of-shader-features

 

BTW. Could you guys spare a vote on this issue? Assuming Unity even pays any attention.

It would be good to be able to write highly customizable shaders without having to chop them up into many simpler ones.