chore(musl): reduce the modifications of musl

Signed-off-by: Caoruihong <crh.cao@huawei.com>
Change-Id: I32b820bc0eb7465bf54d506e7f5e759ef64101e2

lib/libc/BUILD.gn

@@ -60,6 +60,8 @@ kernel_module(module_name) {
       "$OPTRTDIR/string/arm/strcmp.S",
       "$OPTRTDIR/string/arm/strcpy.c",
       "$OPTRTDIR/string/arm/strlen-armv6t2.S",
+    ]
+    sources += [
       "src/arch/arm/memset.S",
       "src/arch/arm/memcmp.S",
     ]
@@ -70,12 +72,20 @@ kernel_module(module_name) {
     ]
   }
 
+  include_dirs = [
+    "$MUSLPORTINGDIR/src/include",
+    "$MUSLPORTINGDIR/src/internal",
+  ]
+
   public_configs = [ ":public" ]
   configs += [ ":private" ]
 }
 
 config("public") {
-  include_dirs = [ "$MUSLPORTINGDIR/include" ]
+  cflags = [
+    "-isystem",
+    rebase_path("$MUSLPORTINGDIR/include"),
+  ]
 }
 
 config("private") {
@@ -92,8 +102,9 @@ config("private") {
     ]
   }
 
-  include_dirs = [
-    "$MUSLPORTINGDIR/src/include",
-    "$MUSLPORTINGDIR/src/internal",
+  cflags += [
+    "-Wno-shift-op-parentheses",
+    "-Wno-logical-op-parentheses",
+    "-Wno-bitwise-op-parentheses",
   ]
 }

lib/libc/Makefile

@@ -53,5 +53,6 @@ LOCAL_FLAGS +=-Wno-char-subscripts -Wno-unknown-pragmas
 else
 LOCAL_FLAGS += -frounding-math -Wno-unused-but-set-variable -Wno-unknown-pragmas
 endif
+LOCAL_FLAGS += -Wno-shift-op-parentheses -Wno-logical-op-parentheses -Wno-bitwise-op-parentheses
 
 include $(MODULE)