address build issues on Windows

Signed-off-by: Ken Museth <ken.museth@gmail.com>

Author: kmuseth

openvdb/openvdb/tools/PolySoupToLevelSet.h

@@ -288,7 +288,9 @@ void PolySoupToLevelSet<GridType>::process(const ShrinkWrapT &D, ProgressT *prog
     }
 
     // Coarse to fine shrink wrap algorithm
-    double vol[2];// levelSetVolume returns Real (double); keep full precision
+    double vol[2] = {0.0, 0.0};// levelSetVolume returns Real (double); keep full precision.
+                               // Zero-init silences a GCC -Wmaybe-uninitialized false positive:
+                               // vol[0] is only read when d>0, after the loop's increment has set it.
     auto grid = mGrids.back();// initiate grid with the coarsest offset
     mGrids.pop_back();
     mIsGridSDF = true;

openvdb_cmd/vdb_tool/include/Util.h

@@ -37,7 +37,11 @@
 #include <string_view>// for Spinner's operator() argument
 #include <vector>
 #include <sys/stat.h>// for stat (used by fileExists)
+#if defined(_WIN32)
+#include <io.h>// for isatty/fileno (used by Spinner's TTY detection); unistd.h is POSIX-only
+#else
 #include <unistd.h>// for isatty (used by Spinner's TTY detection)
+#endif
 #include <chrono>
 #include <ctime>