Unity 4.5 Shader compilation error ( #define macro with '\' symbol at end)

Hi, everyone.

I want to share some experience with you.
When upgraded unity to 4.5, there is some problem I found.

When I build project to android or iOS target, there are several shader compilation errors, which has appeared from nothing. I mean, there is no error in editor, or when just click reimport on shader. Those errors happened only when I build project.

Finally a found the reason.

Code (csharp):

1. #define ANY_DEFINE_NAME /* Absolutely anything ends with next line symbol '\' */ \
2.  
3. #define ANY_DEFINE_AFTER_NEXT_LINE_SYMBOL /*anything here*/

Symbol '\' at the end of first #define macro is cause error when using the second #define macro

I attached source shader code, you can repeat those errors. And steps to reproduce

Spoiler

1) Create new ptoject
2) import that code Unity4.5ShaderCompilationError.zip
3) create new scene
4) create 2 new objects (with renderers) and assign materials ".. with error" and ".. without error" to it. (just to be sure that unity will build and compile those materials' shaders)
5) Press ctrl+shift+b and switch platform to android or iOS.
6) Press ctrl+shift+b and build
7) After biuld, see console output

Or just watch =)

Thank you for your attention.
p.s. Hope it will be fixed at next versions ( Unity 4.3 has no this problem )

 

Did you submit a bug report?

 

No. Not yet.

 

bug report submitted

 

Yes, 614169

Spoiler: Direct Link

http://fogbugz.unity3d.com/default.asp?614169_9du8p74883i7h2e0