Auto-generate well_known_types_embed.cc

Until now this file was just checked into the repo, but actually it
should be generated from any.js, struct.js, and timestamp.js. This
change updates the build system to make this happen. To make it work I
also had to remove some C++11 features from embed.cc.

.gitignore

@@ -47,6 +47,7 @@ any_test.pb.*
 map*unittest.pb.*
 unittest*.pb.*
 cpp_test*.pb.*
+src/google/protobuf/compiler/js/well_known_types_embed.cc
 src/google/protobuf/util/**/*.pb.cc
 src/google/protobuf/util/**/*.pb.h
 
@@ -60,6 +61,7 @@ python/build/
 python/google/protobuf/compiler/
 python/google/protobuf/util/
 
+src/js_embed
 src/protoc
 src/unittest_proto_middleman
 

cmake/libprotoc.cmake

@@ -94,6 +94,18 @@ set(libprotoc_files
   ${protobuf_source_dir}/src/google/protobuf/compiler/zip_writer.cc
 )
 
+set(js_well_known_types_sources,
+  ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types/any.js
+  ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types/struct.js
+  ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types/timestamp.js
+)
+add_executable(js_embed ${protobuf_source_dir}/src/google/protobuf/compiler/js/embed.cc)
+add_custom_command(
+  OUTPUT ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types_embed.cc
+  DEPENDS js_embed ${js_well_known_types_sources}
+  COMMAND js_embed ${js_well_known_types_sources} > ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types_embed.cc
+)
+
 add_library(libprotoc ${protobuf_SHARED_OR_STATIC}
   ${libprotoc_files})
 target_link_libraries(libprotoc libprotobuf)

src/Makefile.am

@@ -483,10 +483,20 @@ libprotoc_la_SOURCES =                                         \
   google/protobuf/compiler/csharp/csharp_wrapper_field.cc      \
   google/protobuf/compiler/csharp/csharp_wrapper_field.h
 
-bin_PROGRAMS = protoc
+bin_PROGRAMS = protoc js_embed
 protoc_LDADD = $(PTHREAD_LIBS) libprotobuf.la libprotoc.la
 protoc_SOURCES = google/protobuf/compiler/main.cc
 
+# The special JS code for the well-known types is linked into the compiler via
+# well_known_types_embed.cc, which is generated from .js source files.
+js_embed_SOURCES = google/protobuf/compiler/js/embed.cc
+js_well_known_types_sources =                                  \
+	google/protobuf/compiler/js/well_known_types/any.js          \
+	google/protobuf/compiler/js/well_known_types/struct.js       \
+	google/protobuf/compiler/js/well_known_types/timestamp.js
+google/protobuf/compiler/js/well_known_types_embed.cc: js_embed$(EXEEXT) $(js_well_known_types_sources)
+	./js_embed$(EXEEXT) $(js_well_known_types_sources) > $@
+
 # Tests ==============================================================
 
 protoc_inputs =                                                   \
@@ -661,7 +671,7 @@ protoc_outputs =                                                  \
   google/protobuf/util/message_differencer_unittest.pb.cc         \
   google/protobuf/util/message_differencer_unittest.pb.h
 
-BUILT_SOURCES = $(protoc_outputs)
+BUILT_SOURCES = $(protoc_outputs) google/protobuf/compiler/js/well_known_types_embed.cc
 
 if USE_EXTERNAL_PROTOC
 

src/google/protobuf/compiler/js/embed.cc

@@ -48,7 +48,8 @@ static char ToDecimalDigit(int num) {
 static std::string CEscape(const std::string& str) {
   std::string dest;
 
-  for (unsigned char ch : str) {
+  for (int i = 0; i < str.size(); ++i) {
+    unsigned char ch = str[i];
     switch (ch) {
       case '\n': dest += "\\n"; break;
       case '\r': dest += "\\r"; break;
@@ -96,18 +97,16 @@ static void AddFile(const char* name, std::basic_ostream<char>* out) {
 }
 
 int main(int argc, char *argv[]) {
-  auto& out = std::cout;
-
-  out << "#include "
+  std::cout << "#include "
                "\"google/protobuf/compiler/js/well_known_types_embed.h\"\n";
-  out << "struct FileToc well_known_types_js[] = {\n";
+  std::cout << "struct FileToc well_known_types_js[] = {\n";
 
   for (int i = 1; i < argc; i++) {
-    AddFile(argv[i], &out);
+    AddFile(argv[i], &std::cout);
   }
 
-  out << "  {NULL, NULL}  // Terminate the list.\n";
-  out << "};\n";
+  std::cout << "  {NULL, NULL}  // Terminate the list.\n";
+  std::cout << "};\n";
 
   return EXIT_SUCCESS;
 }