diff --git a/src/SNAP/compute_snap.cpp b/src/SNAP/compute_snap.cpp
index 43b6a419da..17127107ac 100644
--- a/src/SNAP/compute_snap.cpp
+++ b/src/SNAP/compute_snap.cpp
@@ -33,7 +33,8 @@ enum{SCALAR,VECTOR,ARRAY};
 
 ComputeSnap::ComputeSnap(LAMMPS *lmp, int narg, char **arg) :
   Compute(lmp, narg, arg), cutsq(NULL), list(NULL), snap(NULL),
-  radelem(NULL), wjelem(NULL), snap_peratom(NULL), snapall(NULL)
+  snapall(NULL), snap_peratom(NULL), radelem(NULL), wjelem(NULL),
+  snaptr(NULL)
 {
 
   array_flag = 1;
@@ -41,9 +42,6 @@ ComputeSnap::ComputeSnap(LAMMPS *lmp, int narg, char **arg) :
 
   double rfac0, rmin0;
   int twojmax, switchflag, bzeroflag;
-  radelem = NULL;
-  wjelem = NULL;
-
   int ntypes = atom->ntypes;
   int nargmin = 6+2*ntypes;
 
@@ -413,7 +411,6 @@ void ComputeSnap::compute_array()
     const int typeoffset_local = ndims_peratom*nperdim*itype;
     const int typeoffset_global = nperdim*itype;
     for (int icoeff = 0; icoeff < nperdim; icoeff++) {
-      int irow = 1;
       for (int i = 0; i < ntotal; i++) {
         double *snadi = snap_peratom[i]+typeoffset_local;
         int iglobal = atom->tag[i];
diff --git a/src/USER-CGDNA/pair_oxrna2_xstk.cpp b/src/USER-CGDNA/pair_oxrna2_xstk.cpp
index f5207c53e7..73a73c1ea0 100644
--- a/src/USER-CGDNA/pair_oxrna2_xstk.cpp
+++ b/src/USER-CGDNA/pair_oxrna2_xstk.cpp
@@ -112,7 +112,6 @@ void PairOxrna2Xstk::compute(int eflag, int vflag)
   double theta1,t1dir[3],cost1;
   double theta2,t2dir[3],cost2;
   double theta3,t3dir[3],cost3;
-  double theta4,theta4p,t4dir[3],cost4;
   double theta7,theta7p,t7dir[3],cost7;
   double theta8,theta8p,t8dir[3],cost8;
 
diff --git a/src/USER-MISC/compute_viscosity_cos.cpp b/src/USER-MISC/compute_viscosity_cos.cpp
index 64103d2653..7311f991cc 100644
--- a/src/USER-MISC/compute_viscosity_cos.cpp
+++ b/src/USER-MISC/compute_viscosity_cos.cpp
@@ -256,7 +256,7 @@ void ComputeViscosityCos::remove_bias_all() {
    assume remove_bias() was previously called
 ------------------------------------------------------------------------- */
 
-void ComputeViscosityCos::restore_bias(int i, double *v) {
+void ComputeViscosityCos::restore_bias(int /* i */, double *v) {
   v[0] += vbias[0];
   v[1] += vbias[1];
   v[2] += vbias[2];
@@ -267,7 +267,7 @@ void ComputeViscosityCos::restore_bias(int i, double *v) {
    assume remove_bias_thr() was previously called with the same buffer b
 ------------------------------------------------------------------------- */
 
-void ComputeViscosityCos::restore_bias_thr(int i, double *v, double *b) {
+void ComputeViscosityCos::restore_bias_thr(int /* i */, double *v, double *b) {
   v[0] += b[0];
   v[1] += b[1];
   v[2] += b[2];
diff --git a/src/USER-MISC/fix_accelerate_cos.cpp b/src/USER-MISC/fix_accelerate_cos.cpp
index 0d3b66d3f5..88e33023fd 100644
--- a/src/USER-MISC/fix_accelerate_cos.cpp
+++ b/src/USER-MISC/fix_accelerate_cos.cpp
@@ -58,7 +58,7 @@ void FixAccelerateCos::setup(int vflag) {
 
 /* ---------------------------------------------------------------------- */
 
-void FixAccelerateCos::post_force(int vflag) {
+void FixAccelerateCos::post_force(int /* vflag */) {
   double **x = atom->x;
   double **f = atom->f;
   int *type = atom->type;
diff --git a/src/atom_vec.cpp b/src/atom_vec.cpp
index ef276bcf6a..61ade3b41b 100644
--- a/src/atom_vec.cpp
+++ b/src/atom_vec.cpp
@@ -1834,7 +1834,6 @@ void AtomVec::pack_data(double **buf)
 void AtomVec::write_data(FILE *fp, int n, double **buf)
 {
   int i,j,m,nn,datatype,cols;
-  void *pdata;
 
   for (i = 0; i < n; i++) {
     fprintf(fp,TAGINT_FORMAT,(tagint) ubuf(buf[i][0]).i);
@@ -1983,40 +1982,32 @@ void AtomVec::pack_vel(double **buf)
 void AtomVec::write_vel(FILE *fp, int n, double **buf)
 {
   int i,j,m,nn,datatype,cols;
-  void *pdata;
 
   for (i = 0; i < n; i++) {
     fprintf(fp,TAGINT_FORMAT,(tagint) ubuf(buf[i][0]).i);
 
     j = 1;
     for (nn = 1; nn < ndata_vel; nn++) {
-      pdata = mdata_vel.pdata[nn];
       datatype = mdata_vel.datatype[nn];
       cols = mdata_vel.cols[nn];
       if (datatype == DOUBLE) {
         if (cols == 0) {
-          double *vec = *((double **) pdata);
           fprintf(fp," %-1.16e",buf[i][j++]);
         } else {
-          double **array = *((double ***) pdata);
           for (m = 0; m < cols; m++)
             fprintf(fp," %-1.16e",buf[i][j++]);
         }
       } else if (datatype == INT) {
         if (cols == 0) {
-          int *vec = *((int **) pdata);
           fprintf(fp," %d",(int) ubuf(buf[i][j++]).i);
         } else {
-          int **array = *((int ***) pdata);
           for (m = 0; m < cols; m++)
             fprintf(fp," %d",(int) ubuf(buf[i][j++]).i);
         }
       } else if (datatype == BIGINT) {
         if (cols == 0) {
-          bigint *vec = *((bigint **) pdata);
           fprintf(fp," " BIGINT_FORMAT,(bigint) ubuf(buf[i][j++]).i);
         } else {
-          bigint **array = *((bigint ***) pdata);
           for (m = 0; m < cols; m++)
             fprintf(fp," " BIGINT_FORMAT,(bigint) ubuf(buf[i][j++]).i);
         }