error C1001: An internal error has occurred in the compiler

Question

I am not a C/C++ developer, but I'm trying to port some C++ into a WinRT component. The project builds fine in Debug but fails with C1001 in Release.

This is a code snippet of where it fails (the error line is the second for loop, the one with wq variable)

void init_material() {
	int wp, bp, wn, bn, wl, bl, wd, bd, wr, br, wq, bq, index, score, phase, wb, bb;
	int w_maj, b_maj, w_maj_score, b_maj_score, w_min, b_min, w_tot_score, b_tot_score, wmul, bmul;
	for (index = 0; index < TotalMat; index++) Material[index] = 0xFFFFFFFF;

	for (wq = 0; wq < 3; wq++)
		for (bq = 0; bq < 3; bq++)
			for (wr = 0; wr < 3; wr++)
...

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Valentin Iliescu

Answer 1

Hello,

Would you please provide us more codes about this issue, like how to define Material and then how to use it in your for loop.

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 2

I don't think I can create a smaller sample, but I can send you the entire WinRT project.  

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Valentin Iliescu

Answer 3

Ok, Please upload your project to skydriver, and post the link here.
http://skydrive.live.com/

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 4

I have uploaded the project as GullChess.zip here
https://skydrive.live.com/redir.aspx?cid=a7cd34fab0459777&resid=A7CD34FAB0459777!1265&parid=A7CD34FAB0459777!709&authkey=!ACUAQIoGBTcJlQQ

Building in Debug works fine. The issue shows up when building Release. The platform (X64, X86 etc) does not matter.

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Valentin Iliescu

Answer 5

Hello,

I found that this is optimization's problem. If we change /O1 to /O2, it will work fine.
http://msdn.microsoft.com/en-us/library/8f8h5cxt(v=vs.110).aspx

I will involve more experts to investigate it, Thanks for your feedback.

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 6

Thanks for the fix. Changing the flag from /O2 to /O1 will fix the issue only if the platform is set to WIN32, it will still fail for x64 and ARM.

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Valentin Iliescu

Answer 7

I've reported this bug to the product group. To work around, you can use a pragma:

#pragma optimize("", off)
void init_material() 
{
//...
}
#pragma optimize("", on)

You can also use the predefined compiler macros to scope this workaround to just the compiler version with the issue

http://msdn.microsoft.com/en-us/library/b0084kay(v=vs.110).aspx

-Steve

Answer 8

The pragma works great, it avoids the issue on all platforms. 

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Valentin Iliescu