Modify copy_uapi to improve incremental compilation

Issue:https://gitee.com/openharmony/third_party_musl/issues/I5ML1GSigned-off-by: Nyinchuang <yinchuang@huawei.com>
Signed-off-by: Nyinchuang <yinchuang@huawei.com>

BUILD.gn

@@ -97,7 +97,7 @@ if (is_lite_system && current_os == "ohos") {
   action("create_porting_src") {
     script = "scripts/porting.sh"
 
-    sources = [ "//third_party/musl" ]
+    sources_dir = [ "//third_party/musl" ]
 
     outdir = [ "${target_out_dir}/${musl_ported_dir}" ]
 
@@ -132,7 +132,7 @@ if (is_lite_system && current_os == "ohos") {
       "scripts/create_syscall.sh",
     ]
 
-    args = [ "-i" ] + rebase_path(sources)
+    args = [ "-i" ] + rebase_path(sources_dir)
     args += [ "-o" ] + rebase_path(outdir)
     args += [ "-p" ] + [ "${musl_target_os}" ]
 
@@ -210,43 +210,93 @@ if (is_lite_system && current_os == "ohos") {
     deps = [ ":create_porting_src" ]
   }
 
-  action("make_uapi") {
+  # if uapi_dir does not exist, then make uapi from linux_kernel_dir
+  if (exec_script("/bin/sh",
+                  [
+                    "-c",
+                    "if [ ! -d " + rebase_path(uapi_dir) +
+                        " ]; then echo true; else echo false; fi",
+                  ],
+                  "value")) {
     kernel_dir = rebase_path(linux_kernel_dir)
-    kernel_out_dir = rebase_path(get_path_info("${kernel_dir}/", "out_dir"))
+    kernel_out_dir = "${kernel_dir}/make_output"
     uapi_dir = "${kernel_out_dir}/usr/include"
     make_uapi_cmd = "rm -rf ${uapi_dir}"
     make_uapi_cmd += " && make -C ${kernel_dir} -sj headers O=${kernel_out_dir} ARCH=${target_cpu}"
     make_uapi_cmd += " && cp -f ${kernel_dir}/drivers/staging/android/uapi/ashmem.h ${uapi_dir}/linux/ashmem.h"
     make_uapi_cmd += " && sed -i '/#define _INPUT_H/i#define _UAPI_INPUT_H' ${uapi_dir}/linux/input.h"
     make_uapi_cmd += " && sed -i '/struct __kernel_sockaddr_storage/i#define sockaddr_storage __kernel_sockaddr_storage' ${uapi_dir}/linux/socket.h"
-    outputs = [ "${target_out_dir}/" + rebase_path(uapi_dir, target_out_dir) ]
-    script = "/bin/sh"
-    args = [ "-c" ]
-    args += [ make_uapi_cmd ]
+    args_make_uapi = [ "-c" ]
+    args_make_uapi += [ make_uapi_cmd ]
+    exec_script("/bin/sh", args_make_uapi, "value")
+    uapi_from = "make"
+  } else {
+    uapi_from = "local"
   }
 
-  # if uapi_dir does not exist, then make uapi from linux_kernel_dir
-  if (exec_script("/bin/sh",
-                  [
-                    "-c",
-                    "if [ ! -d " + rebase_path(uapi_dir) +
-                        " ]; then echo true; else echo false; fi",
-                  ],
-                  "value")) {
-    uapi_dir = get_path_info("${linux_kernel_dir}/", "out_dir") + "/usr/include"
-    uapi_deps = [ ":make_uapi" ]
+  uapi_full_path = rebase_path(uapi_dir)
+  arguments_uapi = [ "-c" ]
+
+  # exclude these files because they need special treatment
+  if (uapi_from == "make") {
+    exclude_files = "asm|scsi"
   } else {
-    uapi_deps = []
+    exclude_files = "asm-arm|asm-arm64|scsi"
+  }
+
+  arguments_uapi +=
+      [ "ls ${uapi_full_path} | grep -Ev " + "\"" + "${exclude_files}" + "\"" ]
+  uspi_files = exec_script("/bin/sh", arguments_uapi, "list lines")
+
+  # Generate a copy target for each file
+  foreach(file, uspi_files) {
+    copy("copy_uapi_${file}") {
+      sources = [ "${uapi_dir}/${file}" ]
+      outputs = [ "${target_out_dir}/${musl_inc_out_dir}/${file}" ]
+    }
   }
 
-  action("copy_uapi") {
-    outputs = [ "${target_out_dir}/${musl_inc_out_dir}" ]
-    inputs = [ uapi_dir ]
-    deps = uapi_deps
-    script = "scripts/copy_uapi.sh"
-    args = [ "-i" ] + rebase_path(inputs)
-    args += [ "-o" ] + rebase_path(outputs)
-    args += [ "-t" ] + [ "${musl_arch}" ]
+  group("copy_uapi_scsi") {
+    deps = []
+    sources = []
+    outputs = []
+    uapi_scsi_dir = rebase_path("${uapi_dir}/scsi")
+    arguments_scsi = [ "-c" ]
+    arguments_scsi += [ "ls ${uapi_scsi_dir}" ]
+    uapi_scsi_files = exec_script("/bin/sh", arguments_scsi, "list lines")
+
+    # Generate a copy target for each file in scsi dir to avoid being influenced by musl_copy_inc_scsi output
+    foreach(file, uapi_scsi_files) {
+      copy("copy_uapi_scsi_${file}") {
+        sources += [ "${uapi_dir}/scsi/${file}" ]
+        outputs += [ "${target_out_dir}/${musl_inc_out_dir}/scsi/${file}" ]
+      }
+      deps += [ ":copy_uapi_scsi_${file}" ]
+    }
+  }
+
+  copy("copy_uapi_asm") {
+    if (uapi_from == "local") {
+      if ("${musl_arch}" == "arm") {
+        file_name = "asm-arm"
+      } else {  # aarch64 and x86_64 use same file
+        file_name = "asm-arm64"
+      }
+      sources = [ "${uapi_dir}/${file_name}/asm" ]
+    } else {
+      sources = [ "${uapi_dir}/asm" ]
+    }
+    outputs = [ "${target_out_dir}/${musl_inc_out_dir}/asm" ]
+  }
+
+  group("copy_uapi") {
+    deps = [ ":copy_uapi_scsi" ]
+
+    # We need do different processing for asm according to the source of uapi
+    deps += [ ":copy_uapi_asm" ]
+    foreach(file, uspi_files) {
+      deps += [ ":copy_uapi_${file}" ]
+    }
   }
 
   copy("musl_copy_inc_bits") {