Fix build with hip-clang

Two minor issues are solved:
+ Enclose the kernel function with parenthesis as hip-clang defines
  `hipLaunchKernelGGL` as macro.
+ Need to explicitly include <hsa.h> for hip-clang.

CMakeLists.txt

@@ -146,6 +146,7 @@ if("${HIP_COMPILER}" MATCHES "clang")
     PRIVATE --amdgpu-target=gfx908
     PRIVATE -fgpu-rdc)
   target_link_libraries(rccl PRIVATE -fgpu-rdc)
+  target_include_directories(rccl PRIVATE /opt/rocm/include)
 endif()
 
 if("${HIP_COMPILER}" MATCHES "hcc")

src/misc/enqueue.cu

@@ -71,7 +71,7 @@ ncclResult_t ncclLaunchCooperativeKernelMultiDevice(hipLaunchParams *paramsList,
   for (int i = 0; i < numDevices; i++) {
     hipLaunchParams* params = paramsList+i;
     CUDACHECK(hipSetDevice(cudaDevs[i]));
-    hipLaunchKernelGGL((void (*)(struct ncclColl))params->func, params->gridDim, params->blockDim, params->sharedMem, params->stream, **((struct ncclColl **)(params->args)));
+    hipLaunchKernelGGL(((void (*)(struct ncclColl))params->func), params->gridDim, params->blockDim, params->sharedMem, params->stream, **((struct ncclColl **)(params->args)));
   }
   CUDACHECK(hipSetDevice(savedDev));
   return ncclSuccess;
@@ -185,7 +185,7 @@ ncclResult_t ncclBarrierEnqueueWait(ncclComm_t comm) {
 
   hipLaunchParams *params = comm->myParams;
   if (comm->launchMode == ncclComm::PARALLEL) {
-    hipLaunchKernelGGL((void (*)(struct ncclColl))params->func, params->gridDim, params->blockDim, params->sharedMem, params->stream, **((struct ncclColl **)(params->args)));
+    hipLaunchKernelGGL(((void (*)(struct ncclColl))params->func), params->gridDim, params->blockDim, params->sharedMem, params->stream, **((struct ncclColl **)(params->args)));
   }
   // Start the network proxies as soon as the kernel has been launched. We can't
   // perform any CUDA call between the two or having a hipFree between the CUDA

src/transport.cu

@@ -7,6 +7,7 @@
 
 #include "core.h"
 #include "common_coll.h"
+#include <hsa.h>
 
 extern struct ncclTransport p2pTransport;
 extern struct ncclTransport shmTransport;