Return 0 from getNodePhysMemory() if machine memory size is unknown.

src/main_utils.cpp

@@ -34,7 +34,7 @@ unsigned long getNodePhysMemory() {
     return mem/1024/1024/1024;
 #else
     cout<<"ROCK has not been tested on this operating system, please contact author."<<endl;
-    return unknown_os;
+    return 0;
 #endif
 }
 

src/rock.cpp

@@ -29,7 +29,6 @@
 
 
 
-#define unknown_os 1
 #define defaultGRPMAXSize 1 //(in gigabytes) Default maximum size of srp structure but of course this size depends of the number of reads we are processing.
                             // 1 GB is enough to store approx 82 millions of reads (must take into account memory needed for stl containers).
                             // This constant is used only if you use rock's default behavior (use 90% of the machine's RAM).
@@ -145,7 +144,7 @@ int main(int argc,char * argv[]) {
     parms.lambda=0;
     parms.filter_size=getNodePhysMemory()/100*90-defaultGRPMAXSize; // Prefer not to use all the machine's memory
 
-    if (parms.filter_size==unknown_os) return EXIT_FAILURE;
+    if (parms.filter_size==0) return EXIT_FAILURE;
     while((i = getopt(argc, argv, "i:o:l:k:c:C:g:n:")) != -1) {
         switch(i) {
             case 'i':