[BUILD] Support clang++ compiler (#1316)

* [BUILD] Support clang++ compiler

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

* [BUILD] Enable check_symbol_exists for BFD and clang++

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

* [BUILD] Define default C compiler

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

---------

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

CMakeLists.txt

@@ -114,6 +114,11 @@ if("${CMAKE_CXX_COMPILER}" MATCHES ".*amdclang\\+\\+")
   set(COMPILER_EXE_NAME amdclang++)
   set(COMPILER_GREP_STRING "AMD clang version")
   set(COMPILER_AWK_CMD "awk -F\" \" '{ printf $4}'")
+elseif("${CMAKE_CXX_COMPILER}" MATCHES ".*clang\\+\\+")
+  message(STATUS "Compiling with clang++")
+  set(COMPILER_EXE_NAME clang++)
+  set(COMPILER_GREP_STRING "AMD clang version")
+  set(COMPILER_AWK_CMD "awk -F\" \" '{ printf $4}'")
 elseif("${CMAKE_CXX_COMPILER}" MATCHES ".*hipcc$")
   message(STATUS "Compiling with hipcc")
   set(COMPILER_EXE_NAME hipcc)
@@ -238,6 +243,9 @@ if(BUILD_BFD)
   if (HAVE_BFD)
     message(STATUS "-- Found BFD support")
 
+    ### Required for checking HIP device symbols when building with amdclang++
+    set(CMAKE_REQUIRED_LIBRARIES hip::device)
+
     # Check for specific BFD feature support
     CHECK_SYMBOL_EXISTS(bfd_get_section_flags "bfd.h" HAVE_DECL_BFD_GET_SECTION_FLAGS)
     CHECK_SYMBOL_EXISTS(bfd_get_section_vma   "bfd.h" HAVE_DECL_BFD_GET_SECTION_VMA)
@@ -253,6 +261,8 @@ if(BUILD_BFD)
        }"
       HAVE_TWO_ARG_BFD_SECTION_SIZE)
 
+    unset(CMAKE_REQUIRED_LIBRARIES)
+
     # Check for iberty support
     find_library(HAVE_IBERTY iberty PATHS /usr/lib64 /usr/lib/ PATH_SUFFIXES x86_64-linux-gnu)
     if(HAVE_IBERTY)

toolchain-linux.cmake

@@ -16,3 +16,14 @@ if (NOT DEFINED ENV{CXXFLAGS})
   set(CMAKE_CXX_FLAGS_DEBUG "-g -O1")
   set(CMAKE_CXX_FLAGS_RELEASE "-O3")
 endif()
+
+if (NOT DEFINED ENV{CC})
+  set(CMAKE_C_COMPILER "${rocm_bin}/amdclang" CACHE PATH "Path to the C compiler")
+else()
+  set(CMAKE_C_COMPILER "$ENV{CC}" CACHE PATH "Path to the C compiler")
+endif()
+
+if (NOT DEFINED ENV{CFLAGS})
+  set(CMAKE_C_FLAGS_DEBUG "-g -O1")
+  set(CMAKE_C_FLAGS_RELEASE "-O3")
+endif()