Nsight Eclipse 5.5 identifier is undefined

Question

In a project with many .cu files and a .h file, I have some constants defined in my main.cu like this (shown just one as example):

__device__ __constant__ unsigned int x[1]; #include "second.cu" ... some code...

In the file second.cu I am trying to use that constant, like this:

cudaMemcpyToSymbol(x, y, sizeof(xx));

But Eclipse is giving me the error: identifier "x" is undefined.

I noticed that #includes in my main.cu, like the header.h, I need to specifically add in all the .cu files again. Which produced some redefinition problems that I solved using #pragma once.

I am new to Eclipse in general, found some complains about the CDT regarding include files not being indexed. I tried the Index Rebuild/Update/Freshen/Re-resolve method that worked for some in this regard, but with no luck with my problems.

Also, tried disabling the 'heuristic resolution of includes' in Properties -> Indexer. I thought I got it for a few moments but then the error showed up again.

Any ideas to solve this problem?

Is this reported by compiler?

Eugene
– Eugene

2013-09-23 23:23:02 +00:00
Commented Sep 23, 2013 at 23:23 — Eugene
– Eugene, Commented Sep 23, 2013 at 23:23

kangshiyin · Accepted Answer · 2013-09-21 04:08:39Z

This is a C/C++ problem and have nothing to do with CUDA.

Generally people don't include source files like .cu .cpp .c. Only header files like .h should be included.

If you have a global variable int x need to be referenced in many source files. You could define it in one souce file as

// main.cu int x; ...

declare it in a header file as

// main.h extern int x; ...

and include this header file in all the source files you will reference that variable as

// second.cu #include "main.h" void foo() { int local=x; } ...

and

// third.cu #include "main.h" void bar() { int private=x; } ...

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