change default cc on mac to clang

python/jittor/compiler.py

@@ -706,7 +706,7 @@ def get_full_path_of_executable(name):
 
 def compile_extern():
     # compile llvm passes
-    if cc_type != "clang":
+    if cc_type != "clang" or platform.system() != 'Linux':
         return
     global kernel_opt_flags
     cache_path_llvm = os.path.join(cache_path, "llvm")
@@ -909,7 +909,7 @@ if "cc_flags" in os.environ:
     cc_flags += os.environ["cc_flags"] + ' '
 link_flags = " -lstdc++ -ldl -shared "
 if platform.system() == 'Darwin':
-    # TODO: if not using apple clang, no need to add -lomp
+    # TODO: if not using apple clang, there is no need to add -lomp
     link_flags += "-undefined dynamic_lookup -lomp "
 
 core_link_flags = ""

python/jittor/src/opt/pass/loop_to_func_pass.cc

@@ -99,7 +99,9 @@ void LoopToFuncPass::run() {
         auto& fc = ir->children[i];
         fc->attrs["loop_func"] = func->attrs["lvalue"];
     }
-    // ir->remove_all_unused();
+    #ifdef __APPLE__
+    ir->remove_all_unused();
+    #endif
 }
 
 } // jittor

python/jittor_utils/__init__.py

@@ -293,7 +293,11 @@ is_in_ipynb = in_ipynb()
 cc = None
 LOG = LogWarper()
 
-cc_path = env_or_find('cc_path', 'g++', silent=True)
+if platform.system() == 'Darwin':
+    default_cc = 'clang'
+else:
+    default_cc = 'g++'
+cc_path = env_or_find('cc_path', default_cc, silent=True)
 os.environ["cc_path"] = cc_path
 cc_type = get_cc_type(cc_path)
 cache_path = find_cache_path()