introduce a NOP template for cc

bazel/BUILD

@@ -1,5 +1,14 @@
+load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
+
 config_setting(
     name = "windows_x86_64",
     values = {"cpu": "x64_windows"},
     visibility = ["//visibility:public"],
 )
+
+string_flag(
+    name = "template-flavor",
+    build_setting_default = "",
+    visibility = ["//visibility:public"],
+)
+

bazel/protobuf.bzl

@@ -1,3 +1,4 @@
+load("@bazel_skylib//rules:common_settings.bzl", "BuildSettingInfo")
 load("@bazel_tools//tools/jdk:toolchain_utils.bzl", "find_java_runtime_toolchain", "find_java_toolchain")
 load("@rules_proto//proto:defs.bzl", "ProtoInfo")
 
@@ -44,6 +45,7 @@ def _output_dir(ctx):
 
 def _protoc_gen_validate_cc_impl(ctx):
     """Generate C++ protos using protoc-gen-validate plugin"""
+    flavor = ctx.attr._flavor[BuildSettingInfo].value or ""
     protos = _proto_sources(ctx)
     out_files = []
 
@@ -54,7 +56,7 @@ def _protoc_gen_validate_cc_impl(ctx):
     dir_out = _output_dir(ctx)
 
     args = [
-        "--validate_out=lang=cc:" + dir_out,
+        "--validate_out=lang=cc" + flavor + ":" + dir_out,
     ]
 
     return _protoc_gen_validate_impl(
@@ -119,6 +121,7 @@ cc_proto_gen_validate = rule(
             allow_files = True,
             executable = True,
         ),
+        "_flavor": attr.label(default = ":template-flavor"),
     },
     output_to_genfiles = True,
     implementation = _protoc_gen_validate_cc_impl,

templates/BUILD.bazel

@@ -7,6 +7,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//templates/cc",
+        "//templates/ccnop",
         "//templates/go",
         "//templates/java",
         "//templates/shared",

templates/ccnop/BUILD.bazel

@@ -0,0 +1,15 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "ccnop",
+    srcs = [
+        "file.go",
+        "register.go",
+    ],
+    importpath = "github.com/envoyproxy/protoc-gen-validate/templates/ccnop",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//templates/cc",
+        "@com_github_lyft_protoc_gen_star//:protoc-gen-star",
+    ],
+)

templates/ccnop/file.go

@@ -0,0 +1,56 @@
+package ccnop
+
+const headerFileTpl = `// Code generated by protoc-gen-validate
+// source: {{ .InputPath }}
+// DO NOT EDIT!!!
+
+#pragma once
+
+#include <string>
+
+#include "validate/validate.h"
+#include "{{ output .File ".h" }}"
+
+{{ range .Package.ProtoName.Split }}
+namespace {{ . }} {
+{{- end }}
+
+using std::string;
+
+{{ range .AllMessages }}
+	extern inline bool Validate(__attribute__((unused)) const {{ class . }}& m, __attribute__((unused)) pgv::ValidationMsg* err) { return true; }
+{{ end }}
+
+{{ range .Package.ProtoName.Split -}}
+} // namespace
+{{ end }}
+
+#define X_{{ .Package.ProtoName.ScreamingSnakeCase }}_{{ .File.InputPath.BaseName | screaming_snake_case }}(X) \
+{{ range .AllMessages -}}
+{{- if not (ignored .) -}}
+	X({{class . }}) \
+{{ end -}}
+{{ end }}
+`
+
+const moduleFileTpl = `// Code generated by protoc-gen-validate
+// source: {{ .InputPath }}
+// DO NOT EDIT!!!
+
+#include "{{ output .File ".validate.h" }}"
+
+namespace pgv {
+namespace validate {
+using std::string;
+
+{{ range .AllMessages }}
+{{- if not (ignored .) -}}
+{{- if not (disabled .) -}}
+pgv::Validator<{{ class . }}> {{ staticVarName . }}(static_cast<bool(*)(const {{ class .}}&, pgv::ValidationMsg*)>({{ package .}}::Validate));
+{{- end -}}
+{{ end }}
+{{ end }}
+
+} // namespace validate
+} // namespace pgv
+`

templates/ccnop/register.go

@@ -0,0 +1,18 @@
+package ccnop
+
+import (
+	"text/template"
+
+	"github.com/envoyproxy/protoc-gen-validate/templates/cc"
+	pgs "github.com/lyft/protoc-gen-star"
+)
+
+func RegisterModule(tpl *template.Template, params pgs.Parameters) {
+	cc.RegisterModule(tpl, params)
+	template.Must(tpl.Parse(moduleFileTpl))
+}
+
+func RegisterHeader(tpl *template.Template, params pgs.Parameters) {
+	cc.RegisterHeader(tpl, params)
+	template.Must(tpl.Parse(headerFileTpl))
+}

templates/pkg.go

@@ -6,6 +6,7 @@ import (
 	"github.com/lyft/protoc-gen-star"
 	"github.com/lyft/protoc-gen-star/lang/go"
 	"github.com/envoyproxy/protoc-gen-validate/templates/cc"
+	"github.com/envoyproxy/protoc-gen-validate/templates/ccnop"
 	"github.com/envoyproxy/protoc-gen-validate/templates/go"
 	"github.com/envoyproxy/protoc-gen-validate/templates/java"
 	"github.com/envoyproxy/protoc-gen-validate/templates/shared"
@@ -23,16 +24,19 @@ func makeTemplate(ext string, fn RegisterFn, params pgs.Parameters) *template.Te
 
 func Template(params pgs.Parameters) map[string][]*template.Template {
 	return map[string][]*template.Template{
-		"cc":   {makeTemplate("h", cc.RegisterHeader, params), makeTemplate("cc", cc.RegisterModule, params)},
-		"go":   {makeTemplate("go", golang.Register, params)},
-		"java": {makeTemplate("java", java.Register, params)},
+		"cc":    {makeTemplate("h", cc.RegisterHeader, params), makeTemplate("cc", cc.RegisterModule, params)},
+		"ccnop": {makeTemplate("h", ccnop.RegisterHeader, params), makeTemplate("cc", ccnop.RegisterModule, params)},
+		"go":    {makeTemplate("go", golang.Register, params)},
+		"java":  {makeTemplate("java", java.Register, params)},
 	}
 }
 
 func FilePathFor(tpl *template.Template) FilePathFn {
 	switch tpl.Name() {
 	case "h":
 		return cc.CcFilePath
+	case "ccnop":
+		return cc.CcFilePath
 	case "cc":
 		return cc.CcFilePath
 	case "java":