disable rocrv2, properly

bin/hipcc

@@ -168,7 +168,7 @@ if ($needHipHcc) {
     if ((not -e $object) or ((stat($source))[9] > (stat($object))[9]))  {
         my $CMD = "$HCC $HCCFLAGS  -I$HSA_PATH/include -I$HIP_PATH/include -Wall -c $source -o $object";
         if ($verbose & 0x10) {
-            $CMD .= " -g -O2" ;
+            $CMD .= " -g -O0" ;
         } else {
             $CMD .= " -O3" ;
         }

docs/markdown/hip_porting_guide.md

@@ -290,7 +290,7 @@ hipcc adds the necessary libraries for HIP as well as for the accelerator compil
 
 ### -lm Option
  
-hcc does not add “-lm” by default. If you see errors about missing math functions at link time (e.g., "sqrt@@GLIBC_2.2.5"), ensure that “-lm” is in the link options.
+hipcc adds -lm by default to the link command.
 
 
 ## Linking Code With Other Compilers

src/hip_hcc.cpp

@@ -792,7 +792,7 @@ hipError_t ihipDevice_t::getProperties(hipDeviceProp_t* prop)
     // Group memory will not be paged out, so, the physical memory size is the total shared memory size, and also equal to the group region size.
     prop->maxSharedMemoryPerMultiProcessor = prop->totalGlobalMem;
 
-#ifdef USE_ROCR_V2
+#if USE_ROCR_V2
     // Get Max memory clock frequency
     err = hsa_region_get_info(*am_region, (hsa_region_info_t)HSA_AMD_REGION_INFO_MAX_CLOCK_FREQUENCY, &prop->memoryClockRate);
     DeviceErrorCheck(err);
@@ -1269,12 +1269,10 @@ hipError_t hipDeviceGetAttribute(int* pi, hipDeviceAttribute_t attr, int device)
             *pi = prop->regsPerBlock; break;
         case hipDeviceAttributeClockRate:
             *pi = prop->clockRate; break;
-#ifdef USE_ROCR_V2
         case hipDeviceAttributeMemoryClockRate:
             *pi = prop->memoryClockRate; break;
         case hipDeviceAttributeMemoryBusWidth:
             *pi = prop->memoryBusWidth; break;
-#endif
         case hipDeviceAttributeMultiprocessorCount:
             *pi = prop->multiProcessorCount; break;
         case hipDeviceAttributeComputeMode:
@@ -2309,6 +2307,7 @@ hipError_t hipMemcpy(void* dst, const void* src, size_t sizeBytes, hipMemcpyKind
 #endif
 /**
  * @result #hipSuccess, #hipErrorInvalidDevice, #hipErrorInvalidMemcpyDirection, #hipErrorInvalidValue
+ * @warning on HCC hipMemcpyAsync does not support overlapped H2D and D2H copies.
  */
 //---
 hipError_t hipMemcpyAsync(void* dst, const void* src, size_t sizeBytes, hipMemcpyKind kind, hipStream_t stream)