gn build: Add a resource_dir.gni file.

[pcc]

Summary

The path to the resource directory will end up being used in several
more places once the support for running check-hwasan lands. This
moves the definition to a central location so that it can be used
from those places.

[phosek]

llvm/utils/gn/secondary/llvm/resource_dir.gni

3 ↗

(On Diff #181709)

Shouldn't this be clang_resource_dir? clang/CMakeLists.txt defines this as CLANG_RESOURCE_DIR and so does clang/include/clang/Config/config.h, clang/lib/Driver/Driver.cpp and clang/lib/Frontend/CompilerInvocation.cpp.

[pcc]

• Rename to clang_resource_dir

llvm/utils/gn/secondary/llvm/resource_dir.gni

3 ↗

(On Diff #181709)

Works for me, done.

[phosek]

LGTM

llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn

+import("//clang/resource_dir.gni")
 import("//clang/utils/TableGen/clang_tablegen.gni")
-import("//llvm/version.gni")
 
 # Generate arm_neon.h
 clang_tablegen("arm_neon") {
   args = [ "-gen-arm-neon" ]
   td_file = "//clang/include/clang/Basic/arm_neon.td"
   output_name = "arm_neon.h"
 }
 
 # Generate arm_fp16.h
 clang_tablegen("arm_fp16") {
   args = [ "-gen-arm-fp16" ]
   td_file = "//clang/include/clang/Basic/arm_fp16.td"
   output_name = "arm_fp16.h"
 }
 
-output_dir = "$root_out_dir/lib/clang/$llvm_version/include"
-
 copy("arm_headers") {
   visibility = [ ":Headers" ]
   deps = [
     ":arm_fp16",
     ":arm_neon",
   ]
   sources = get_target_outputs(":arm_neon") + get_target_outputs(":arm_fp16")
   outputs = [
-    "$output_dir/{{source_file_part}}",
+    "$clang_resource_dir/include/{{source_file_part}}",
   ]
 }
 
 copy("Headers") {
   deps = [
     ":arm_headers",
   ]
 
sources = [
     "xsaveoptintrin.h",
     "xsavesintrin.h",
     "xtestintrin.h",
     "cuda_wrappers/algorithm",
     "cuda_wrappers/complex",
     "cuda_wrappers/new",
   ]
   outputs = [
-    "$output_dir/{{source_target_relative}}",
+    "$clang_resource_dir/include/{{source_target_relative}}",
   ]
 }

llvm/utils/gn/secondary/clang/resource_dir.gni

+import("//llvm/version.gni")
+
+clang_resource_dir = "$root_build_dir/lib/clang/$llvm_version"

llvm/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn

-import("//llvm/version.gni")
+import("//clang/resource_dir.gni")
 
 # FIXME: Make this support more platforms.
 assert(current_os == "android")
 
-runtime_output_dir = "$root_build_dir/lib/clang/$llvm_version/lib/linux"
+runtime_output_dir = "$clang_resource_dir/lib/linux"
 runtime_target = "aarch64-android"
 
 action("version_script") {
   script = "//compiler-rt/lib/sanitizer_common/scripts/gen_dynamic_list.py"
   sources = [
     "hwasan.syms.extra",
   ]
   deps = [