move build_variables.bzl and ufunc_defs.bzl from pytorch-root/tools/ to the root

Pull Request resolved: https://github.com/pytorch/pytorch/pull/78542

This makes importing easier in different build systems that have
different absolute names for the pytorch-root.

Differential Revision: [D36782582](https://our.internmc.facebook.com/intern/diff/D36782582/)

**NOTE FOR REVIEWERS**: This PR has internal Facebook specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D36782582/)!

Approved by: https://github.com/malfet

BUILD.bazel

@@ -4,11 +4,11 @@ load("@rules_proto//proto:defs.bzl", "proto_library")
 load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_proto_library", "cc_test")
 load("//third_party:substitution.bzl", "header_template_rule")
 load("//:tools/bazel.bzl", "rules")
-load("//:tools/build_variables.bzl", "jit_core_sources", "libtorch_core_sources", "libtorch_cuda_sources", "libtorch_distributed_sources", "libtorch_extra_sources", "libtorch_nvfuser_generated_headers", "libtorch_nvfuser_runtime_sources", "libtorch_python_core_sources", "torch_cpp_srcs", "lazy_tensor_ts_sources")
 load("//tools/rules:cu.bzl", "cu_library")
 load("//tools/config:defs.bzl", "if_cuda")
 load("//:aten.bzl", "intern_build_aten_ops", "generate_aten", "aten_ufunc_generated_cpu_sources", "aten_ufunc_generated_cpu_kernel_sources", "aten_ufunc_generated_cuda_sources")
 load(":build.bzl", "define_targets", "GENERATED_AUTOGRAD_CPP", "GENERATED_AUTOGRAD_PYTHON")
+load(":build_variables.bzl", "jit_core_sources", "libtorch_core_sources", "libtorch_cuda_sources", "libtorch_distributed_sources", "libtorch_extra_sources", "libtorch_nvfuser_generated_headers", "libtorch_nvfuser_runtime_sources", "libtorch_python_core_sources", "torch_cpp_srcs", "lazy_tensor_ts_sources")
 
 define_targets(rules = rules)
 

BUILD.buck

@@ -1,7 +1,7 @@
 load("//tools/build_defs:glob_defs.bzl", "subdir_glob")
 load("//tools/build_defs:fb_xplat_genrule.bzl", "fb_xplat_genrule")
 load(
-    "//tools:build_variables.bzl",
+    ":build_variables.bzl",
     "aten_cpu_source_list",
     "aten_native_source_list",
     "core_sources_common",
@@ -10,7 +10,7 @@ load(
     "libtorch_profiler_sources",
 )
 load(
-    "//:pt_defs.oss.bzl",
+    ":pt_defs.oss.bzl",
     "USED_PT_BACKENDS",
     "build_aten_cpu",
     "gen_aten_files",

MANIFEST.in

@@ -4,8 +4,10 @@ include CITATION
 include LICENSE
 include NOTICE
 include .gitmodules
+include build_variables.bzl
 include mypy.ini
 include requirements.txt
+include ufunc_defs.bzl
 include version.txt
 recursive-include android *.*
 recursive-include aten *.*

aten.bzl

@@ -1,6 +1,6 @@
 load("@bazel_skylib//lib:paths.bzl", "paths")
 load("@rules_cc//cc:defs.bzl", "cc_library")
-load("//:tools/build_variables.bzl", "aten_ufunc_headers")
+load(":build_variables.bzl", "aten_ufunc_headers")
 
 CPU_CAPABILITY_NAMES = ["DEFAULT", "AVX2"]
 CAPABILITY_COMPILER_FLAGS = {

cmake/Codegen.cmake

@@ -349,11 +349,11 @@ function(append_filelist name outputvar)
   set(_rootdir "${${CMAKE_PROJECT_NAME}_SOURCE_DIR}/")
   # configure_file adds its input to the list of CMAKE_RERUN dependencies
   configure_file(
-      ${PROJECT_SOURCE_DIR}/tools/build_variables.bzl
+      ${PROJECT_SOURCE_DIR}/build_variables.bzl
       ${PROJECT_BINARY_DIR}/caffe2/build_variables.bzl)
   execute_process(
     COMMAND "${PYTHON_EXECUTABLE}" -c
-            "exec(open('${PROJECT_SOURCE_DIR}/tools/build_variables.bzl').read());print(';'.join(['${_rootdir}' + x for x in ${name}]))"
+            "exec(open('${PROJECT_SOURCE_DIR}/build_variables.bzl').read());print(';'.join(['${_rootdir}' + x for x in ${name}]))"
     WORKING_DIRECTORY "${_rootdir}"
     RESULT_VARIABLE _retval
     OUTPUT_VARIABLE _tempvar)

pt_defs.oss.bzl

@@ -1,16 +1,13 @@
 load("@bazel_skylib//lib:paths.bzl", "paths")
+load("//tools/build_defs:fb_xplat_genrule.bzl", "fb_xplat_genrule")
+load("//tools/build_defs:type_defs.bzl", "is_list", "is_string")
+load(":build_variables.bzl", "aten_native_source_list")
 load(
-    "//tools:build_variables.bzl",
+    ":ufunc_defs.bzl",
-    "aten_native_source_list",
-)
-load(
-    "//tools:ufunc_defs.bzl",
     "aten_ufunc_generated_cpu_kernel_sources",
     "aten_ufunc_generated_cpu_sources",
     "aten_ufunc_generated_cuda_sources",
 )
-load("//tools/build_defs:fb_xplat_genrule.bzl", "fb_xplat_genrule")
-load("//tools/build_defs:type_defs.bzl", "is_list", "is_string")
 
 USED_PT_BACKENDS = [
     "CPU",