Add env check

Author: Chao1Han

comms/torchcomms/xccl/CMakeLists.txt

@@ -1,12 +1,28 @@
 # Extension: torchcomms._comms_xccl
-file(GLOB TORCHCOMMS_XCCL_SOURCES "comms/torchcomms/xccl/*.cpp")
-file(GLOB TORCHCOMMS_XPU_API_SOURCE "comms/torchcomms/device/XpuApi.cpp")
 
+# Check if CCL_ROOT is set
+if(NOT DEFINED ENV{CCL_ROOT})
+    message(WARNING "oneCCL environment not found, Skipping XCCL backend compilation.")
+    return()
+endif()
+
+# Set XCCL paths
 set(XCCL_INCLUDE "$ENV{CCL_ROOT}/include")
 set(XCCL_SHARED_LIB "$ENV{CCL_ROOT}/lib/libccl.so.2")
 
-include(FindPackageHandleStandardArgs)
+# Validate oneCCL installation
+if(NOT EXISTS "${XCCL_INCLUDE}" OR NOT EXISTS "${XCCL_SHARED_LIB}")
+    message(WARNING "Invalid oneCCL path. Skipping XCCL backend compilation.")
+    return()
+endif()
+
+message(STATUS "XCCL include path   : ${XCCL_INCLUDE}")
+message(STATUS "XCCL library        : ${XCCL_SHARED_LIB}")
 
+file(GLOB TORCHCOMMS_XCCL_SOURCES "comms/torchcomms/xccl/*.cpp")
+file(GLOB TORCHCOMMS_XPU_API_SOURCE "comms/torchcomms/device/XpuApi.cpp")
+
+include(FindPackageHandleStandardArgs)
 
 add_library(torchcomms_comms_xccl MODULE
     ${TORCHCOMMS_XCCL_SOURCES}