Bug "Null function or function signature mismatch" error when Native .a plugin used in WebGL

Hi, I am porting SkiaSharp project to work in Unity:
https://github.com/dr-vij/SkiaSharpForUnity
There is only Unity WebGL native library yet, and I found a strange behavior that looks like a bug. So, I’ll tell what I’ve done and what have happened then:

1. I built Skia native libraries using Emscripten 2.0.19 (same version as Unity 2021.2.0f1 editor has) The library: libSkiaSharp.a in Plugins folder.
2. I added SkiaSharp managed library with static bindings. Bindings are inside SkiaApi.generated.cs in Scripts/SkiaWrapper folder.
3. I created a simple scene whit a cube and SkiaTest.cs that creates 64x64 green bitmap and draws a black circle in it’s center and sets it to Texture2D on cube material.

And now, the problem that I am investigating is:
Everything works fine in development build only. You can see it at:
https://vij.app/skia-unity-dev/
or you can build it from my repository (Unity2021.2.0f1_DEV_BUILD_WORLS_ONLY tag).
Just select WebGL and set Development build in Build settings. (Unity 2021.2.0f1)
You should see something like this after start:


The logs are also fine:

Spoiler: Successfull log

Code (CSharp):

1. skia-unity-dev.framework.js:1746 Test start
2. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
3. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
4. UnityEngine.Logger:Log(LogType, Object)
5. UnityEngine.Debug:LogWarning(Object)
6. SkiaTest:Start()
7.  
8. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
9. skia-unity-dev.framework.js:1746 bitmap was created
10. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
11. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
12. UnityEngine.Logger:Log(LogType, Object)
13. UnityEngine.Debug:LogWarning(Object)
14. SkiaTest:Start()
15.  
16. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
17. skia-unity-dev.framework.js:1746 skCanvas was created
18. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
19. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
20. UnityEngine.Logger:Log(LogType, Object)
21. UnityEngine.Debug:LogWarning(Object)
22. SkiaTest:Start()
23.  
24. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
25. skia-unity-dev.framework.js:1746 skSolor was prepared
26. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
27. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
28. UnityEngine.Logger:Log(LogType, Object)
29. UnityEngine.Debug:LogWarning(Object)
30. SkiaTest:Start()
31.  
32. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
33. skia-unity-dev.framework.js:1746 skCanvas was cleared
34. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
35. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
36. UnityEngine.Logger:Log(LogType, Object)
37. UnityEngine.Debug:LogWarning(Object)
38. SkiaTest:Start()
39.  
40. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
41. skia-unity-dev.framework.js:1746 circle was drawn
42. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
43. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
44. UnityEngine.Logger:Log(LogType, Object)
45. UnityEngine.Debug:LogWarning(Object)
46. SkiaTest:Start()
47.  
48. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
49. skia-unity-dev.framework.js:1746 skCanvas was Flushed
50. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
51. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
52. UnityEngine.Logger:Log(LogType, Object)
53. UnityEngine.Debug:LogWarning(Object)
54. SkiaTest:Start()
55.  
56. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
57. skia-unity-dev.framework.js:1746 bitmap was loaded to unity texture
58. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
59. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
60. UnityEngine.Logger:Log(LogType, Object)
61. UnityEngine.Debug:LogWarning(Object)
62. SkiaTest:Start()
63.  
64. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
65. skia-unity-dev.framework.js:1746 texture was applied and set to material
66. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
67. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
68. UnityEngine.Logger:Log(LogType, Object)
69. UnityEngine.Debug:LogWarning(Object)
70. SkiaTest:Start()
71.  
72. _JS_Log_Dump @ skia-unity-dev.framework.js:1746
73. skia-unity-dev.framework.js:1746 Test end
74. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
75. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
76. UnityEngine.Logger:Log(LogType, Object)
77. UnityEngine.Debug:LogWarning(Object)
78. SkiaTest:Start()
79.  

But nothing works at all if you try the same in nondevelopment build (Development build checkbox unselected). You can see it at:
https://vij.app/skia-unity/
Or build yourself from the same repository with the same tag and all settings, but Development Build must be not checked

The result looks like this:



and the logs are:

Spoiler: Errors log

Code (CSharp):

1. Test start
2. UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
3. UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
4. UnityEngine.Logger:Log(LogType, Object)
5. UnityEngine.Debug:LogWarning(Object)
6. SkiaTest:Start()
7.  
8. exception thrown: RuntimeError: null function or function signature mismatch,RuntimeError: null function or function signature mismatch
9.     at wasm://wasm/05bbe122:wasm-function[16507]:0x80d776
10.     at wasm://wasm/05bbe122:wasm-function[3265]:0x12ef46
11.     at wasm://wasm/05bbe122:wasm-function[3266]:0x12f05f
12.     at wasm://wasm/05bbe122:wasm-function[5633]:0x26e4c1
13.     at wasm://wasm/05bbe122:wasm-function[16148]:0x7e70fc
14.     at wasm://wasm/05bbe122:wasm-function[7797]:0x3cc79b
15.     at wasm://wasm/05bbe122:wasm-function[2495]:0xcdaec
16.     at wasm://wasm/05bbe122:wasm-function[47786]:0x1430563
17.     at wasm://wasm/05bbe122:wasm-function[19143]:0x90f60f
18.     at invoke_i (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422394)
19.     at wasm://wasm/05bbe122:wasm-function[46729]:0x13fbfbb
20.     at wasm://wasm/05bbe122:wasm-function[38683]:0x1141cf5
21.     at invoke_ii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:421906)
22.     at wasm://wasm/05bbe122:wasm-function[46730]:0x13fc05a
23.     at wasm://wasm/05bbe122:wasm-function[26999]:0xbf06b0
24.     at wasm://wasm/05bbe122:wasm-function[5149]:0x236081
25.     at wasm://wasm/05bbe122:wasm-function[19147]:0x90f645
26.     at invoke_iiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422234)
27.     at wasm://wasm/05bbe122:wasm-function[1497]:0x67ce4
28.     at wasm://wasm/05bbe122:wasm-function[3560]:0x158ad5
29.     at wasm://wasm/05bbe122:wasm-function[1359]:0x5853e
30.     at wasm://wasm/05bbe122:wasm-function[19146]:0x90f637
31.     at invoke_vi (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422892)
32.     at wasm://wasm/05bbe122:wasm-function[19893]:0x93a2c5
33.     at wasm://wasm/05bbe122:wasm-function[26999]:0xbf06b0
34.     at wasm://wasm/05bbe122:wasm-function[5149]:0x236081
35.     at wasm://wasm/05bbe122:wasm-function[19147]:0x90f645
36.     at invoke_iiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422234)
37.     at wasm://wasm/05bbe122:wasm-function[1497]:0x67ce4
38.     at wasm://wasm/05bbe122:wasm-function[3560]:0x158ad5
39.     at wasm://wasm/05bbe122:wasm-function[1359]:0x5853e
40.     at wasm://wasm/05bbe122:wasm-function[19146]:0x90f637
41.     at invoke_vi (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422892)
42.     at wasm://wasm/05bbe122:wasm-function[18369]:0x8ea23a
43.     at wasm://wasm/05bbe122:wasm-function[19138]:0x90f4e6
44.     at invoke_viiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:423053)
45.     at wasm://wasm/05bbe122:wasm-function[18368]:0x8e9fe5
46.     at wasm://wasm/05bbe122:wasm-function[19149]:0x90f65d
47.     at invoke_vii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:421746)
48.     at wasm://wasm/05bbe122:wasm-function[18364]:0x8e9a86
49.     at wasm://wasm/05bbe122:wasm-function[19138]:0x90f4e6
50.     at invoke_viiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:423053)
51.     at wasm://wasm/05bbe122:wasm-function[18365]:0x8e9d38
52.     at wasm://wasm/05bbe122:wasm-function[19144]:0x90f61d
53.     at invoke_viii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422735)
54.     at wasm://wasm/05bbe122:wasm-function[42818]:0x12cd8db
55.     at wasm://wasm/05bbe122:wasm-function[27746]:0xc0245b
56.     at wasm://wasm/05bbe122:wasm-function[5149]:0x236081
57.     at wasm://wasm/05bbe122:wasm-function[19147]:0x90f645
58.     at invoke_iiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422234)
59. printErr @ skia-unity.loader.js:1
60. callUserCallback @ skia-unity.framework.js:2
61. runIter @ skia-unity.framework.js:2
62. Browser_mainLoop_runner @ skia-unity.framework.js:2
63. requestAnimationFrame (async)
64. requestAnimationFrame @ skia-unity.framework.js:2
65. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
66. Browser_mainLoop_runner @ skia-unity.framework.js:2
67. requestAnimationFrame (async)
68. requestAnimationFrame @ skia-unity.framework.js:2
69. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
70. Browser_mainLoop_runner @ skia-unity.framework.js:2
71. requestAnimationFrame (async)
72. requestAnimationFrame @ skia-unity.framework.js:2
73. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
74. Browser_mainLoop_runner @ skia-unity.framework.js:2
75. requestAnimationFrame (async)
76. requestAnimationFrame @ skia-unity.framework.js:2
77. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
78. Browser_mainLoop_runner @ skia-unity.framework.js:2
79. requestAnimationFrame (async)
80. requestAnimationFrame @ skia-unity.framework.js:2
81. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
82. Browser_mainLoop_runner @ skia-unity.framework.js:2
83. requestAnimationFrame (async)
84. requestAnimationFrame @ skia-unity.framework.js:2
85. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
86. Browser_mainLoop_runner @ skia-unity.framework.js:2
87. requestAnimationFrame (async)
88. requestAnimationFrame @ skia-unity.framework.js:2
89. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
90. Browser_mainLoop_runner @ skia-unity.framework.js:2
91. requestAnimationFrame (async)
92. requestAnimationFrame @ skia-unity.framework.js:2
93. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
94. Browser_mainLoop_runner @ skia-unity.framework.js:2
95. requestAnimationFrame (async)
96. requestAnimationFrame @ skia-unity.framework.js:2
97. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
98. Browser_mainLoop_runner @ skia-unity.framework.js:2
99. requestAnimationFrame (async)
100. requestAnimationFrame @ skia-unity.framework.js:2
101. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
102. Browser_mainLoop_runner @ skia-unity.framework.js:2
103. requestAnimationFrame (async)
104. requestAnimationFrame @ skia-unity.framework.js:2
105. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
106. Browser_mainLoop_runner @ skia-unity.framework.js:2
107. requestAnimationFrame (async)
108. requestAnimationFrame @ skia-unity.framework.js:2
109. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
110. Browser_mainLoop_runner @ skia-unity.framework.js:2
111. requestAnimationFrame (async)
112. requestAnimationFrame @ skia-unity.framework.js:2
113. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
114. Browser_mainLoop_runner @ skia-unity.framework.js:2
115. requestAnimationFrame (async)
116. requestAnimationFrame @ skia-unity.framework.js:2
117. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
118. Browser_mainLoop_runner @ skia-unity.framework.js:2
119. requestAnimationFrame (async)
120. requestAnimationFrame @ skia-unity.framework.js:2
121. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
122. Browser_mainLoop_runner @ skia-unity.framework.js:2
123. requestAnimationFrame (async)
124. requestAnimationFrame @ skia-unity.framework.js:2
125. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
126. Browser_mainLoop_runner @ skia-unity.framework.js:2
127. requestAnimationFrame (async)
128. requestAnimationFrame @ skia-unity.framework.js:2
129. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
130. Browser_mainLoop_runner @ skia-unity.framework.js:2
131. requestAnimationFrame (async)
132. requestAnimationFrame @ skia-unity.framework.js:2
133. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
134. Browser_mainLoop_runner @ skia-unity.framework.js:2
135. requestAnimationFrame (async)
136. requestAnimationFrame @ skia-unity.framework.js:2
137. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
138. Browser_mainLoop_runner @ skia-unity.framework.js:2
139. requestAnimationFrame (async)
140. requestAnimationFrame @ skia-unity.framework.js:2
141. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
142. Browser_mainLoop_runner @ skia-unity.framework.js:2
143. requestAnimationFrame (async)
144. requestAnimationFrame @ skia-unity.framework.js:2
145. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
146. Browser_mainLoop_runner @ skia-unity.framework.js:2
147. requestAnimationFrame (async)
148. requestAnimationFrame @ skia-unity.framework.js:2
149. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
150. Browser_mainLoop_runner @ skia-unity.framework.js:2
151. requestAnimationFrame (async)
152. requestAnimationFrame @ skia-unity.framework.js:2
153. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
154. Browser_mainLoop_runner @ skia-unity.framework.js:2
155. requestAnimationFrame (async)
156. requestAnimationFrame @ skia-unity.framework.js:2
157. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
158. Browser_mainLoop_runner @ skia-unity.framework.js:2
159. requestAnimationFrame (async)
160. requestAnimationFrame @ skia-unity.framework.js:2
161. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
162. Browser_mainLoop_runner @ skia-unity.framework.js:2
163. requestAnimationFrame (async)
164. requestAnimationFrame @ skia-unity.framework.js:2
165. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
166. Browser_mainLoop_runner @ skia-unity.framework.js:2
167. requestAnimationFrame (async)
168. requestAnimationFrame @ skia-unity.framework.js:2
169. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
170. Browser_mainLoop_runner @ skia-unity.framework.js:2
171. requestAnimationFrame (async)
172. requestAnimationFrame @ skia-unity.framework.js:2
173. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
174. Browser_mainLoop_runner @ skia-unity.framework.js:2
175. requestAnimationFrame (async)
176. requestAnimationFrame @ skia-unity.framework.js:2
177. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
178. Browser_mainLoop_runner @ skia-unity.framework.js:2
179. requestAnimationFrame (async)
180. requestAnimationFrame @ skia-unity.framework.js:2
181. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
182. Browser_mainLoop_runner @ skia-unity.framework.js:2
183. requestAnimationFrame (async)
184. requestAnimationFrame @ skia-unity.framework.js:2
185. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
186. Browser_mainLoop_runner @ skia-unity.framework.js:2
187. requestAnimationFrame (async)
188. requestAnimationFrame @ skia-unity.framework.js:2
189. Browser_mainLoop_scheduler_rAF @ skia-unity.framework.js:2
190. Browser_mainLoop_runner @ skia-unity.framework.js:2
191. skia-unity.loader.js:1 Invoking error handler due to
192. RuntimeError: null function or function signature mismatch
193. at wasm://wasm/05bbe122:wasm-function[16507]:0x80d776
194.     at wasm://wasm/05bbe122:wasm-function[3265]:0x12ef46
195.     at wasm://wasm/05bbe122:wasm-function[3266]:0x12f05f
196.     at wasm://wasm/05bbe122:wasm-function[5633]:0x26e4c1
197.     at wasm://wasm/05bbe122:wasm-function[16148]:0x7e70fc
198.     at wasm://wasm/05bbe122:wasm-function[7797]:0x3cc79b
199.     at wasm://wasm/05bbe122:wasm-function[2495]:0xcdaec
200.     at wasm://wasm/05bbe122:wasm-function[47786]:0x1430563
201.     at wasm://wasm/05bbe122:wasm-function[19143]:0x90f60f
202.     at invoke_i (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422394)
203.     at wasm://wasm/05bbe122:wasm-function[46729]:0x13fbfbb
204.     at wasm://wasm/05bbe122:wasm-function[38683]:0x1141cf5
205.     at invoke_ii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:421906)
206.     at wasm://wasm/05bbe122:wasm-function[46730]:0x13fc05a
207.     at wasm://wasm/05bbe122:wasm-function[26999]:0xbf06b0
208.     at wasm://wasm/05bbe122:wasm-function[5149]:0x236081
209.     at wasm://wasm/05bbe122:wasm-function[19147]:0x90f645
210.     at invoke_iiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422234)
211.     at wasm://wasm/05bbe122:wasm-function[1497]:0x67ce4
212.     at wasm://wasm/05bbe122:wasm-function[3560]:0x158ad5
213.     at wasm://wasm/05bbe122:wasm-function[1359]:0x5853e
214.     at wasm://wasm/05bbe122:wasm-function[19146]:0x90f637
215.     at invoke_vi (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422892)
216.     at wasm://wasm/05bbe122:wasm-function[19893]:0x93a2c5
217.     at wasm://wasm/05bbe122:wasm-function[26999]:0xbf06b0
218.     at wasm://wasm/05bbe122:wasm-function[5149]:0x236081
219.     at wasm://wasm/05bbe122:wasm-function[19147]:0x90f645
220.     at invoke_iiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422234)
221.     at wasm://wasm/05bbe122:wasm-function[1497]:0x67ce4
222.     at wasm://wasm/05bbe122:wasm-function[3560]:0x158ad5
223.     at wasm://wasm/05bbe122:wasm-function[1359]:0x5853e
224.     at wasm://wasm/05bbe122:wasm-function[19146]:0x90f637
225.     at invoke_vi (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422892)
226.     at wasm://wasm/05bbe122:wasm-function[18369]:0x8ea23a
227.     at wasm://wasm/05bbe122:wasm-function[19138]:0x90f4e6
228.     at invoke_viiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:423053)
229.     at wasm://wasm/05bbe122:wasm-function[18368]:0x8e9fe5
230.     at wasm://wasm/05bbe122:wasm-function[19149]:0x90f65d
231.     at invoke_vii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:421746)
232.     at wasm://wasm/05bbe122:wasm-function[18364]:0x8e9a86
233.     at wasm://wasm/05bbe122:wasm-function[19138]:0x90f4e6
234.     at invoke_viiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:423053)
235.     at wasm://wasm/05bbe122:wasm-function[18365]:0x8e9d38
236.     at wasm://wasm/05bbe122:wasm-function[19144]:0x90f61d
237.     at invoke_viii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422735)
238.     at wasm://wasm/05bbe122:wasm-function[42818]:0x12cd8db
239.     at wasm://wasm/05bbe122:wasm-function[27746]:0xc0245b
240.     at wasm://wasm/05bbe122:wasm-function[5149]:0x236081
241.     at wasm://wasm/05bbe122:wasm-function[19147]:0x90f645
242.     at invoke_iiii (https://vij.app/skia-unity/Build/skia-unity.framework.js:2:422234)
243.  

Spoiler: Error log 2

[ line 8174292]
An abnormal situation has occurred: the PlayerLoop internal function has been called recursively. Please contact Customer Support with a sample project so that we can reproduce the problem and troubleshoot it.
SkiaSharp.SkiaApi:sk_fontmgr_ref_default()
SkiaSharp.SKFontManager:.cctor()
SkiaSharp.SKObject:.cctor()
SkiaSharp.SKBitmap:.ctor(IntPtr, Boolean)
SkiaSharp.SKBitmap:.ctor()
SkiaSharp.SKBitmap:.ctor(SKImageInfo, Int32)
SkiaSharp.SKBitmap:.ctor(SKImageInfo)
SkiaTest:Start()
[ line 8174292]

p.s. I've already sent bug report with links to:

https://vij.app/skia-unity-dev
https://vij.app/skia-unity
https://github.com/dr-vij/SkiaSharpForUnity

Hope it will help in problem investigation

 

2021.2.1f1 - Same behaviour.

Reported a bug, Case 1377787

 

i had the same issue in 2021.1 . i fixed it my enabling decompreson fallback, although that isn't fixing it now. Have you guys fixed the problem yet?

 

2021.2.2f1 - Same error.

 

I have solved this issue by changing Player Settings > Publishing Settings > Enable Exceptions to Full Without Stacktrace.

 

Thank you, I've just checked, but unfortunately, this option does not solve the issue in my case. I apologise that is something special case with native lib

 

2021.2.3f1 - Same error.

The issue has been registered

https://issuetracker.unity3d.com/is...-native-function-from-a-static-linked-library

 

2021.2.4f1 - Same error.

 

As the issue is still 'active', I don't think it's worth pointing every version it is still happening...

 

I am bumping cause error is critical and not mentioned as in progress or something like this. I know bugs that were not fixed by Unity for years. This forum is my only communication way to be sure something will be seen and fixed maybe. The problem also not mentioned in "Known issues" in Unity release and no any information about its priority. So I do all I can. Bump my problem in forum.

p.s. Maybe somebody will see it and vote by the provided link to issue

 

Fair point.

My suggestion is then to try to poke some of the active Unity Devs using "@" (you can find them in various posts here). They might at least give you some some backgrounder as to why it's lower in the priorities. Or if there's another issue# that's blocking the resolution.

 

@JoshPeterson, @LeonhardP, Hi!

Maybe I could ask you, sorry for bumping in forum and wasting your time, but could you please tell if this bug will be fixed in 2021.2? It totally blocks from using native libraries like skia in unity. And it seems that it can be fixed cause everything works fine in development build mode.

To save your time:
The bug:
https://issuetracker.unity3d.com/is...-native-function-from-a-static-linked-library

The repo with reproduction:
https://github.com/dr-vij/SkiaSharpForUnity

The working dev build:
https://vij.app/skia-unity-dev/

The buggy non-dev build:
https://vij.app/skia-unity/

ps. Checked 2021.2.5, not fixed yet

 

Thank you for so quick response)

 

Hi! Thank you for you answer. I will do what I can to help to investigate it.

So I've unpacked the archive, looks like freetype is inside. I've also checked native build cake settings. Looks correct too. And skia is built with static settings, so all inner libraries should be statically linked. If signature mismatch, why does it work in dev build in 2021.2? What have changed in 2022 that it stopped building at all on my machine? The logs are not very informative. I can investigate the problem if you could give recommendations what to check

 

Important addition:
I see that your log in 2022 is not like my in 2021.2.0f1, so I decided to check other versions. I built the project with different versions of unity and thats what I have:

After deeper investigation I found that behaviour has changed after Unity 2021.2.3f1 and development builds stopped working for me since 2021.2.4f1

2021.2.3f1: The last successful development build that works can be created in this version
2021.2.4f1/5f1/6f1: development mode builds but don't work (for my example I mean)
2022.2.0b1/b2: build fails with exception. Something changed there again. So I cant check these versions

Unity 2021.2.3f1 result in wasm (development build) :


Unity 2021.2.4f1/5f1/6f1 result in wasm (development build):


Unity 2022.1.0b1/b2 (Compliation error, develpment build):

Code (CSharp):

1. Building /Users/vij/WorkProjects/MyProjects/SkiaSharpForUnity/Library/Bee/artifacts/WebGL/il2cppOutput/UnityICallRegistration.cpp failed with output:
2. Unhandled Exception:
3. System.TypeInitializationException: The type initializer for 'Sys' threw an exception. ---> System.DllNotFoundException: /Applications/Unity/Hub/Editor/2022.1.0b2/Unity.app/Contents/MonoBleedingEdge/lib/../lib/libmono-native.dylib assembly:<unknown assembly> type:<unknown type> member:(null)
4.   at (wrapper managed-to-native) Interop+Sys.LChflagsCanSetHiddenFlag()
5.   at Interop+Sys..cctor () [0x00000] in <310a9ad4970f473680d13544528e598a>:0
6.    --- End of inner exception stack trace ---
7.   at System.IO.FileSystem.FileExists (System.ReadOnlySpan`1[T] fullPath, System.Int32 fileType, Interop+ErrorInfo& errorInfo) [0x00007] in <310a9ad4970f473680d13544528e598a>:0
8.   at System.IO.FileSystem.DirectoryExists (System.ReadOnlySpan`1[T] fullPath, Interop+ErrorInfo& errorInfo) [0x00000] in <310a9ad4970f473680d13544528e598a>:0
9.   at System.IO.FileSystem.DirectoryExists (System.ReadOnlySpan`1[T] fullPath) [0x00000] in <310a9ad4970f473680d13544528e598a>:0
10.   at System.IO.Directory.Exists (System.String path) [0x0001e] in <310a9ad4970f473680d13544528e598a>:0
11.   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x000c1] in <310a9ad4970f473680d13544528e598a>:0
12.   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share) [0x00000] in <310a9ad4970f473680d13544528e598a>:0
13.   at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
14.   at Mono.Cecil.ModuleDefinition.GetFileStream (System.String fileName, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share) [0x00006] in <a6860a9f6366437387ebdc1f225b7fd4>:0
15.   at Mono.Cecil.ModuleDefinition.ReadModule (System.String fileName, Mono.Cecil.ReaderParameters parameters) [0x00008] in <a6860a9f6366437387ebdc1f225b7fd4>:0
16.   at Mono.Cecil.ModuleDefinition.ReadModule (System.String fileName) [0x00007] in <a6860a9f6366437387ebdc1f225b7fd4>:0
17.   at Mono.Cecil.AssemblyDefinition.ReadAssembly (System.String fileName) [0x00000] in <a6860a9f6366437387ebdc1f225b7fd4>:0
18.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.AssemblyDefinitionFor (System.String path) [0x00001] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
19.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.get_AssemblyDefinition () [0x00013] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
20.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.CollectAllInternalCalls () [0x00008] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
21.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.get_InternalCallsByType () [0x0000e] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
22.   at Unity.InternalCallRegistrationWriter.Runner.DefaultRunner.Run (Unity.InternalCallRegistrationWriter.Runner.InternalCallOptions options) [0x00022] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
23.   at Unity.InternalCallRegistrationWriter.Runner.DefaultRunner.ParseOptionsAndRun (System.String[] args) [0x00008] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
24.   at Unity.InternalCallRegistrationWriter.Program.Main (System.String[] args) [0x00001] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
25. [ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'Sys' threw an exception. ---> System.DllNotFoundException: /Applications/Unity/Hub/Editor/2022.1.0b2/Unity.app/Contents/MonoBleedingEdge/lib/../lib/libmono-native.dylib assembly:<unknown assembly> type:<unknown type> member:(null)
26.   at (wrapper managed-to-native) Interop+Sys.LChflagsCanSetHiddenFlag()
27.   at Interop+Sys..cctor () [0x00000] in <310a9ad4970f473680d13544528e598a>:0
28.    --- End of inner exception stack trace ---
29.   at System.IO.FileSystem.FileExists (System.ReadOnlySpan`1[T] fullPath, System.Int32 fileType, Interop+ErrorInfo& errorInfo) [0x00007] in <310a9ad4970f473680d13544528e598a>:0
30.   at System.IO.FileSystem.DirectoryExists (System.ReadOnlySpan`1[T] fullPath, Interop+ErrorInfo& errorInfo) [0x00000] in <310a9ad4970f473680d13544528e598a>:0
31.   at System.IO.FileSystem.DirectoryExists (System.ReadOnlySpan`1[T] fullPath) [0x00000] in <310a9ad4970f473680d13544528e598a>:0
32.   at System.IO.Directory.Exists (System.String path) [0x0001e] in <310a9ad4970f473680d13544528e598a>:0
33.   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x000c1] in <310a9ad4970f473680d13544528e598a>:0
34.   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share) [0x00000] in <310a9ad4970f473680d13544528e598a>:0
35.   at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
36.   at Mono.Cecil.ModuleDefinition.GetFileStream (System.String fileName, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share) [0x00006] in <a6860a9f6366437387ebdc1f225b7fd4>:0
37.   at Mono.Cecil.ModuleDefinition.ReadModule (System.String fileName, Mono.Cecil.ReaderParameters parameters) [0x00008] in <a6860a9f6366437387ebdc1f225b7fd4>:0
38.   at Mono.Cecil.ModuleDefinition.ReadModule (System.String fileName) [0x00007] in <a6860a9f6366437387ebdc1f225b7fd4>:0
39.   at Mono.Cecil.AssemblyDefinition.ReadAssembly (System.String fileName) [0x00000] in <a6860a9f6366437387ebdc1f225b7fd4>:0
40.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.AssemblyDefinitionFor (System.String path) [0x00001] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
41.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.get_AssemblyDefinition () [0x00013] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
42.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.CollectAllInternalCalls () [0x00008] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
43.   at Unity.InternalCallRegistrationWriter.Collector.InternalCallCollector.get_InternalCallsByType () [0x0000e] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
44.   at Unity.InternalCallRegistrationWriter.Runner.DefaultRunner.Run (Unity.InternalCallRegistrationWriter.Runner.InternalCallOptions options) [0x00022] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
45.   at Unity.InternalCallRegistrationWriter.Runner.DefaultRunner.ParseOptionsAndRun (System.String[] args) [0x00008] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
46.   at Unity.InternalCallRegistrationWriter.Program.Main (System.String[] args) [0x00001] in <0d3380eb5a25466c9471bc2ee62bbd90>:0
47. UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) (at /Users/bokken/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:189)

I hope my information can be usefull. Please feel free to ask me to provide any extra info, I will do it if I can

I will try to rebuild skia native to make sure that I can create a working example of skfonts rendering

 

yeh works for me, didnt even need full stacktrace, thanks.

 

@MarcelPursche, after some investigation I found a way to make native plugin work in 2022.2.0b3.

1) I removed asmdef
2) I switched to development build.

Now I get this:


It stopped throwing signature mismatch error and the native plugin works, but there is a new type of error after texture was applied.

The reason of signature mismatch in dev/non dev mode was the asmdef. The application works in dev mode like before after asmdef was removed. Maybe it can help. I can upload example to my repo.

 

Oh, I've tried so much parameters changes and so much builds, now I am totally confused what parameters were the main reason of successfull dev build.

So I've set exceptions to none, build mode to development, and it works... but in dev mode only. Very frustrating situation.

soooo, no errors here. looks like it is a combination of problems in 2022/2021.2 after emscripten update maybe



I've uploaded this working example to my repo, tag WorksInDevBuild_2022.2.0b3
branch WasmErrorInvestigation.

https://github.com/dr-vij/SkiaSharpForUnity

 

Hi! of course, I can, and thank you so much for investigation of this problem! I will write the instructions of how to build it in next post.

 

@MarcelPursche, Hi!

So, thats my temp repo that helps to rename all conflicting names with unity:

https://github.com/dr-vij/SkiaPorterHelper

change paths to your SkiaSharp folder and run it. It will rename all conflicting methods/classes in .h, .c and etc files

 

Hey I am having this issue - how do i see where the issue lies ? - standalone works fine - webgl throws the exception thrown: RuntimeError: indirect call signature mismatch error - tried different settings like exception with no stack trace - with stack trace no exception - clearing the library and relaunching - cleaning the build then rebuilding..same error

 

reverted to 2020 resolved the issue - which kinda sucks - but ill leave it on an LTS for now​

 

@MarcelPursche, Hi! Sorry for bumping this thread, but could you tell if there are any news about this bug? Could you maybe tell what are emscripten args differences between development and nondevelopment in Unity 2021.2/2022.1? I can try rebuild skia native libraries myself to make them work

 

Encoutering the same issue with 2021.2.9f1

 

@MarcelPursche, I tried to change build settings of skia native, and it worked in 2021.2

the settings in cake are:
$"skia_enable_fontmgr_custom_directory=false " +
$"skia_enable_fontmgr_custom_empty=true " +
$"skia_enable_fontmgr_custom_embedded=false " +
$"skia_enable_fontmgr_empty=true " +

I will try to investigate it and upload the results on github. Everything works if freetype is not linked to the library

 

looks like this problem:
https://github.com/emscripten-core/emscripten/issues/15528
but not sure yet

 

@JoshPeterson Hello, don't you know, is there any news about this bug? I can provide arguments and instructions how the library was built. Or maybe can I get information about what args does Unity use when wasm is built?

 

Hi! I have tried to build with these extra flags have not noticed any warnings at library build.

Thats how does the new config look like:
$"extra_cflags_cc=[ '-frtti', '-Wbad-function-cast', '-Wcast-function-type']"+

 

It is compiled with skianative with the same compiler as I know, I looked in ninja files and cake files and I see that it is build together and included in one .a library

 

Hey, im getting this issue as well. Has there been any updates on its reolutions?

 

Also getting this issue, any solutions???

 

We're seeing this error too. Following the solution here, changing Speed to Size, seems to fix the issue, but it also increases our build sizes, so it's less than ideal for webgl.

 

Cache may be one of the reasons. Try clear browsing data.

 

Any updates?

 

Unfortunately they closed my bug as Won't Do, I got the message that emscripten version may change from version to version and my version (the same as that unity version) is not correct anymore. So I decided to write my drawing api myself, without skia wasm.

 

Perhaps this might help. I used to get a null function, too. But in my case a static Action was used without checking it for null. So I called it as follows: "Action(arguments)" instead of "Actiion?.Invoke(arguments)".

 

I have solved this issue by deleting browser cache. Ctrl + Shift + Delete

 

Still getting this error, clearing browser cache did not fix error

 

Getting this error from release WebGL build. Clearing browser cache did fix it, but this is not ideal. Happened on two seperate devices already. The game im writing is for kids, and if this occurs again in their browsers, they won't know how to fix it. Any solutions long term?

 

There is no solution, it's a bug in unity and they can't fix it, you can do nothing if even the developer of the engine gave up

 

Hi All,

Would that be somehow possible at least to catch this event / detect this situation somehow?
As this happens when the build is being loaded, so the app itself cant detect it, as it cannot even launch.
The only thing I see is the error in the browser's console, but as far as I know, I cant read the browser's console at all with JS or with anything else. (only with my own eyes if I open the developer console window in the browser)
I am just wondering, if the Unity JS, that loads the WEBGL build, which probably throws this exception would be able to realise this and take some action.
For example: I would implement a simple pop up window, asking the user to reload the page, close the browser and open it back, etc ... anything would be better, than that the loading process simply stops and that's it ...

Thx for your feedback!

 

no have solution?

 

I am sorry guys, but we all are talking about different bugs and situations. My bug was about compiling C++ library (Skia Sharp) to native .a plugin used inside unity wasm build, and my problem was about changes in emscripten in different unity versions. So we all are talking about different bugs/problems with same symptoms in webgl build: signature mismatch, but the reasons of these bugs are different because of different reproduction sceneries. I think you should create separate forum threads for your problems and bump somebody from Unity, cause I think Unity team knows that my bug is closed as won't do/by design and won't help here.

 

Hello, I have a similar error, I do not know what to do with it. I have no idea about solving this error because I am just starting to develop Unity games. Maybe you can tell me how to solve it? In unity, the game works, but in the browser, when passing all 30 levels, it should be moved to the level selection menu, however, this error pops up and if you refresh the page, the game will no longer work when you click on the game launch button and the same window with the error name will be displayed. I have the latest version of unity 2021 installed

 

Hello, do you know how to solve my similar error? I don't know how solve this((