fix(toolchain): multiple fixes for cxx cross build and on macOS

.bazelrc

@@ -14,6 +14,7 @@ common --color=yes
 common --curses=auto
 
 build --experimental_ui_max_stdouterr_bytes=10485760
+# required to build shared library on macOS
 build --experimental_cc_shared_library
 
 build --show_progress_rate_limit=0

build/BUILD.bazel

@@ -103,7 +103,7 @@ kong_directory_genrule(
         "@openresty",
         "@openresty//:luajit",
         "@protoc//:all_srcs",
-        "@snappy//:snappy",
+        "@snappy//:snappy-lib",
     ] + select({
         "@kong//:skip_webui_flags": [],
         "//conditions:default": [
@@ -153,7 +153,7 @@ kong_directory_genrule(
         tar -cC ${LUAJIT}/share . | tar -xC ${BUILD_DESTDIR}/openresty/luajit/share
         chmod -R "+rw" ${BUILD_DESTDIR}/openresty/luajit
 
-        SNAPPY=${WORKSPACE_PATH}/$(dirname $(echo '$(locations @snappy//:snappy)' | awk '{print $1}'))
+        SNAPPY=${WORKSPACE_PATH}/$(dirname $(echo '$(locations @snappy//:snappy-lib)' | awk '{print $1}'))
         cp ${SNAPPY}/libsnappy.${libext} ${BUILD_DESTDIR}/kong/lib
 
         LUAROCKS=${WORKSPACE_PATH}/$(dirname '$(location @luarocks//:luarocks_make)')/luarocks_tree

build/openresty/snappy/BUILD.bazel

@@ -59,7 +59,7 @@ cc_library(
 )
 
 cc_library(
-    name = "snappy.a",
+    name = "snappy",
     srcs = [
         "snappy.cc",
         "snappy-c.cc",
@@ -84,9 +84,19 @@ cc_library(
     ],
 )
 
+# workaround for apple_cc_toolchain doesn't support dynamic linker feature
 cc_shared_library(
-    name = "snappy",
-    deps = [":snappy.a"],
+    name = "snappy-macos-lib",
+    shared_lib_name = "libsnappy.dylib",
+    deps = [":snappy"],
+)
+
+alias(
+    name = "snappy-lib",
+    actual = select({
+        "@platforms//os:osx": ":snappy-macos-lib",
+        "//conditions:default": ":snappy",
+    }),
 )
 
 filegroup(

build/repositories.bzl

@@ -8,6 +8,7 @@ load("//build/cross_deps:repositories.bzl", "cross_deps_repositories")
 load("//build/libexpat:repositories.bzl", "libexpat_repositories")
 load("//build:build_system.bzl", "github_release")
 load("@kong_bindings//:variables.bzl", "KONG_VAR")
+load("//build/toolchain:bindings.bzl", "load_bindings")
 
 _SRCS_BUILD_FILE_CONTENT = """
 filegroup(
@@ -75,6 +76,8 @@ def kong_resty_websocket_repositories():
     )
 
 def build_repositories():
+    load_bindings(name = "toolchain_bindings")
+
     libexpat_repositories()
     luarocks_repositories()
 

build/toolchain/BUILD

@@ -28,7 +28,7 @@ cc_toolchain_config(
     compiler_configuration = {},
     target_cpu = "aarch64",
     toolchain_path_prefix = "/usr/aarch64-linux-gnu/",  # is this required?
-    tools_path_prefix = "/usr/bin/aarch64-linux-gnu-",
+    tools_prefix = "aarch64-linux-gnu-",
 )
 
 cc_toolchain(

build/toolchain/bindings.bzl

@@ -0,0 +1,13 @@
+"""
+Global variables
+"""
+
+def _load_bindings_impl(ctx):
+    root = "/".join(ctx.execute(["pwd"]).stdout.split("/")[:-1])
+
+    ctx.file("BUILD.bazel", "")
+    ctx.file("variables.bzl", "INTERNAL_ROOT = \"%s\"\n" % root)
+
+load_bindings = repository_rule(
+    implementation = _load_bindings_impl,
+)