add check for filename in nvrtc_helper.h

Common/helper_string.h

@@ -421,6 +421,7 @@ inline char *sdkFindFilePath(const char *filename,
   }
 
   // File not found
+  printf("\nerror: sdkFindFilePath: file <%s> not found!\n", filename);
   return 0;
 }
 

Common/nvrtc_helper.h

@@ -49,6 +49,11 @@
 
 void compileFileToCUBIN(char *filename, int argc, char **argv, char **cubinResult,
                       size_t *cubinResultSize, int requiresCGheaders) {
+  if (!filename) {
+    std::cerr << "\nerror: filename is empty for compileFileToCUBIN()!\n";
+    exit(1);
+  }
+
   std::ifstream inputFile(filename,
                           std::ios::in | std::ios::binary | std::ios::ate);
 
@@ -111,7 +116,12 @@ void compileFileToCUBIN(char *filename, int argc, char **argv, char **cubinResul
 
     compileOptions = "--include-path=";
 
-    std::string path = sdkFindFilePath(HeaderNames, argv[0]);
+    char *strPath = sdkFindFilePath(HeaderNames, argv[0]);
+    if (!strPath) {
+      std::cerr << "\nerror: header file " << HeaderNames << " not found!\n";
+      exit(1);
+    }
+    std::string path = strPath;
     if (!path.empty()) {
       std::size_t found = path.find(HeaderNames);
       path.erase(found);
@@ -120,6 +130,7 @@ void compileFileToCUBIN(char *filename, int argc, char **argv, char **cubinResul
           "\nCooperativeGroups headers not found, please install it in %s "
           "sample directory..\n Exiting..\n",
           argv[0]);
+      exit(1);
     }
     compileOptions += path.c_str();
     compileParams[numCompileOptions] = reinterpret_cast<char *>(