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Created attachment 3589 [details]
log_x86_build

Hi,

I build SDL with Visual studio 2017 compiler on Windows Server 2016, but it failed with the error C1083:  Cannot open include file: '../../cpuinfo/SDL_simd.h': No such file or directory. I fount that it can be reproduced form b2d4dcb4ba33 changeset. #include "../../cpuinfo/SDL_simd.h" in SDL_surface.c cause this error. I tried to replace #include "../../cpuinfo/SDL_simd.h" with #include "../cpuinfo/SDL_simd.h". It can be compiled pass.Could you help have a look about this issue? Thanks in advance!

Steps to Reproduce:
1.hg clone https://hg.libsdl.org/SDL D:\SDL\src
2.Open a VS 2017 x86 command prompt as admin and browse to D:\SDL
3.msbuild /p:Configuration=Release /p:Platform=Win32 /p:WindowsTargetPlatformVersion=10.0.17134.0 VisualC\SDL.sln /t:Rebuild

Actual result:
D:\SDL\src\src\video\SDL_surface.c(29,10): error C1083:  Cannot open include file: '../../cpuinfo/SDL_simd.h': No such file or directory (d:\agent\_work\2\s\src\vctools\Compiler\CxxFE\sl\p1\c\p0prepro.c:1709) [D:\SDL\src\VisualC\SDL\SDL.vcxproj]
D:\SDL\src\src\video\SDL_surface.c(29,10): error C1083: #include "../../cpuinfo/SDL_simd.h" [D:\SDL\src\VisualC\SDL\SDL.vcxproj]
D:\SDL\src\src\video\SDL_surface.c(29,10): error C1083:          ^ [D:\SDL\src\VisualC\SDL\SDL.vcxproj]
Done Building Project "D:\SDL\src\VisualC\SDL\SDL.vcxproj" (Rebuild target(s)) -- FAILED.
Project "D:\SDL\src\VisualC\SDL.sln" (1) is building "D:\SDL\src\VisualC\SDLmain\SDLmain.vcxproj" (3) on node 1