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POStatic library with multiple .h and .cu files can't resolve functions
 

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  1. POStatic library with multiple .h and .cu files can't resolve functions
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    <p>When compiling a static library with multiple.h and .cu files I get an unresolved extern function. Here is a short example that replicates the error.</p> <p>It appears that I can't get Nsight Eclipse Edition to compile extrafunctions.cu first. In my full project the file with extra functions <em>is</em> compiled first but it still throws the unable to resolve external function error.</p> <p>Here's the output for this sample:</p> <pre><code>**** Build of configuration Debug for project linkerror **** make all Building file: ../cudatest.cu Invoking: NVCC Compiler nvcc -I/usr/local/cuda/include -G -g -O0 -gencode arch=compute_30,code=sm_30 -odir "" -M -o "cudatest.d" "../cudatest.cu" nvcc --compile -G -I/usr/local/cuda/include -O0 -g -gencode arch=compute_30,code=compute_30 -gencode arch=compute_30,code=sm_30 -x cu -o "cudatest.o" "../cudatest.cu" ../cudatest.cu(19): warning: variable "devInts" is used before its value is set ../cudatest.cu(19): warning: variable "devInts" is used before its value is set ptxas fatal : Unresolved extern function '_Z9incrementi' make: *** [cudatest.o] Error 255 **** Build Finished **** </code></pre> <p>cudatest.h:</p> <pre><code>#ifndef CUDAPATH_H_ #define CUDAPATH_H_ #include &lt;cuda.h&gt; #include &lt;cuda_runtime.h&gt; #include "extrafunctions.h" void test(); #endif /* CUDAPATH_H_ */ </code></pre> <p>cudatest.cu:</p> <pre><code>#include &lt;cuda.h&gt; #include &lt;cuda_runtime.h&gt; #include "extrafunctions.h" __global__ void kernel(int* devInts){ int tid = threadIdx.x + (blockDim.x*blockIdx.x); if (tid == 0){ for(int i = 0; i &lt; NUMINTS; i++){ devInts[i] = increment(devInts[i]); } } } void test(){ int* myInts = (int*)malloc(NUMINTS * sizeof(int)); int* devInts; cudaMemcpy((void**)devInts, myInts, NUMINTS*sizeof(int), cudaMemcpyHostToDevice); kernel&lt;&lt;&lt;1,1&gt;&gt;&gt;(devInts); int* outInts = (int*)malloc(NUMINTS * sizeof(int)); cudaFree(devInts); free(myInts); free(outInts); } </code></pre> <p>extrafunctions.h:</p> <pre><code>#ifndef EXTRAFUNCTIONS_H_ #define EXTRAFUNCTIONS_H_ #include &lt;cuda.h&gt; #include &lt;cuda_runtime.h&gt; #define NUMINTS 4 int __device__ increment(int i); #endif /* EXTRAFUNCTIONS_H_ */ </code></pre> <p>extrafunctions.cu:</p> <pre><code>#include &lt;cuda.h&gt; #include &lt;cuda_runtime.h&gt; #include "extrafunctions.h" int __device__ increment(int i){ return i+1; } </code></pre>
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    1. COIf you can create a simple reproducer, it would help. It may be a c/c++ linkage problem. For me anyway, there's not enough info in your post to guess at what is going on. Even if you posted your compile command lines, it might help.
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      1. POStatic library with multiple .h and .cu files can't resolve functions
      1. USRobert Crovella
    2. CO@RobertCrovella I reworded it to include a short example that replicates the problem and the compile command lines & output.
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      1. POStatic library with multiple .h and .cu files can't resolve functions
      1. USSean
    3. COSomehow we need to get nsight EE to issue this command instead of the 2nd compile command you have posted: `nvcc -dc -G -I/usr/local/cuda/include -O0 -g -gencode arch=compute_30,code=compute_30 -gencode arch=compute_30,code=sm_30 -x cu -o "cudatest.o" "../cudatest.cu"` How exactly is this project set up in nsight EE? What type of project do you have specified? The --compile switch is telling the compiler to generate non-relocatable device code, which must have all it's link points fixed up. -dc creates relocatable (essentially unlinked) code.
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      1. POStatic library with multiple .h and .cu files can't resolve functions
      1. USRobert Crovella
 

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