$ nvcc --version
nvcc: NVIDIA ® Cuda compiler driver
Copyright © 2005-2017 NVIDIA Corporation
Built on Fri_Sep__1_21:08:03_CDT_2017
Cuda compilation tools, release 9.0, V9.0.176
The error is:
MyFile.cu(231): error: expression must have pointer type
The relevant code:
JNIEXPORT jboolean JNICALL Java_MyFile_convergeMatrixCuda (
JNIEnv *env, jclass clazz, jfloatArray fxnMatrixJ, jfloatArray mulMatrixJ, jfloatArray addMatrixJ,
jfloatArray resultsJ, jint numRowsJ, jint numColsJ, jint maxIterations, jfloat epsilonJ)
{
int numRows = (int) numRowsJ;
int numCols = (int) numColsJ;
int maxIter = (int) maxIterations;
float epsilon = (float) epsilonJ;
float *fxnMatrixH = (*env)->GetFloatArrayElements (env, fxnMatrixJ, NULL);
GetFloatArrayElements returns a float*. Replacing “(*env)->GetFloatArrayElements” with “(env)->GetFloatArrayElements” gets these errors:
MyFile.cu(231): error: argument of type “JNIEnv *” is incompatible with parameter of type “jfloatArray”
MyFile.cu(231): error: argument of type “jfloatArray” is incompatible with parameter of type “jboolean *”
MyFile.cu(231): error: too many arguments in function call
nvcc does work correctly when compiling non-JNI code