ppc64le build (envoyproxy#4183)

Build for Linux on Power (ppc64le). There is no luajit support for ppc64le, so
this PR puts in logic to not add that recipe to the sandbox speedup that
envoy uses for its build.

There were already some differences taken into account for Windows, so
hopefully this isn't too far out there.

Description: Build for Linux on Power (ppc64le).
Risk Level: low
Testing: manual + have built this into istio/proxy for a few releases now
Docs Changes: Would need to add a bit about Power support
Release Notes: same

Signed-off-by: Christy Norman <christy@linux.vnet.ibm.com>

bazel/BUILD

@@ -40,6 +40,11 @@ config_setting(
     values = {"cpu": "x64_windows"},
 )
 
+config_setting(
+    name = "linux_ppc",
+    values = {"cpu": "ppc"},
+)
+
 config_setting(
     name = "windows_opt_build",
     values = {

bazel/repositories.bzl

@@ -14,6 +14,9 @@ load(
 )
 load("@bazel_tools//tools/cpp:lib_cc_configure.bzl", "get_env_var")
 
+# dict of {build recipe name: longform extension name,}
+PPC_SKIP_TARGETS = {"luajit": "envoy.filters.http.lua"}
+
 def _repository_impl(name, **kwargs):
     # `existing_rule_keys` contains the names of repositories that have already
     # been defined in the Bazel workspace. By skipping repos with existing keys,
@@ -71,6 +74,9 @@ def _repository_impl(name, **kwargs):
             )
 
 def _build_recipe_repository_impl(ctxt):
+    # modify the recipes list based on the build context
+    recipes = _apply_dep_blacklist(ctxt, ctxt.attr.recipes)
+
     # Setup the build directory with links to the relevant files.
     ctxt.symlink(Label("//bazel:repositories.sh"), "repositories.sh")
     ctxt.symlink(Label("//bazel:repositories.bat"), "repositories.bat")
@@ -80,7 +86,7 @@ def _build_recipe_repository_impl(ctxt):
     )
     ctxt.symlink(Label("//ci/build_container:recipe_wrapper.sh"), "recipe_wrapper.sh")
     ctxt.symlink(Label("//ci/build_container:Makefile"), "Makefile")
-    for r in ctxt.attr.recipes:
+    for r in recipes:
         ctxt.symlink(
             Label("//ci/build_container/build_recipes:" + r + ".sh"),
             "build_recipes/" + r + ".sh",
@@ -99,9 +105,9 @@ def _build_recipe_repository_impl(ctxt):
         env["CXX"] = "cl"
         env["CXXFLAGS"] = "-DNDEBUG"
         env["CFLAGS"] = "-DNDEBUG"
-        command = ["./repositories.bat"] + ctxt.attr.recipes
+        command = ["./repositories.bat"] + recipes
     else:
-        command = ["./repositories.sh"] + ctxt.attr.recipes
+        command = ["./repositories.sh"] + recipes
 
     print("Fetching external dependencies...")
     result = ctxt.execute(
@@ -259,6 +265,7 @@ def envoy_dependencies(path = "@envoy_deps//", skip_targets = []):
         name = "envoy_deps",
         recipes = recipes.to_list(),
     )
+
     for t in TARGET_RECIPES:
         if t not in skip_targets:
             native.bind(
@@ -527,3 +534,19 @@ def _com_github_google_jwt_verify():
         name = "jwt_verify_lib",
         actual = "@com_github_google_jwt_verify//:jwt_verify_lib",
     )
+
+def _apply_dep_blacklist(ctxt, recipes):
+    newlist = []
+    skip_list = dict()
+    if _is_linux_ppc(ctxt):
+        skip_list = PPC_SKIP_TARGETS
+    for t in recipes:
+        if t not in skip_list.keys():
+            newlist.append(t)
+    return newlist
+
+def _is_linux_ppc(ctxt):
+    if ctxt.os.name != "linux":
+        return False
+    res = ctxt.execute(["uname", "-m"])
+    return "ppc" in res.stdout

source/exe/BUILD

@@ -11,6 +11,7 @@ load(
     "envoy_all_extensions",
     "envoy_windows_extensions",
 )
+load("//bazel:repositories.bzl", "PPC_SKIP_TARGETS")
 
 envoy_package()
 
@@ -40,6 +41,7 @@ envoy_cc_library(
         "//source/server:test_hooks_lib",
     ] + select({
         "//bazel:windows_x86_64": envoy_windows_extensions(),
+        "//bazel:linux_ppc": envoy_all_extensions(PPC_SKIP_TARGETS),
         "//conditions:default": envoy_all_extensions(),
     }),
 )

source/extensions/all_extensions.bzl

@@ -1,7 +1,7 @@
 load("@envoy_build_config//:extensions_build_config.bzl", "EXTENSIONS", "WINDOWS_EXTENSIONS")
 
 # Return all extensions to be compiled into Envoy.
-def envoy_all_extensions():
+def envoy_all_extensions(blacklist = dict()):
     # These extensions are registered using the extension system but are required for the core
     # Envoy build.
     all_extensions = [
@@ -10,8 +10,9 @@ def envoy_all_extensions():
     ]
 
     # These extensions can be removed on a site specific basis.
-    for path in EXTENSIONS.values():
-        all_extensions.append(path)
+    for name, path in EXTENSIONS.items():
+        if not name in blacklist.values():
+            all_extensions.append(path)
 
     return all_extensions