Enable rtp_rtcp WASM build.

Author: jianjunz

talk/owt/BUILD.gn

@@ -295,7 +295,7 @@ static_library("owt_sdk_base") {
       "sdk/base/customizedaudiodevicemodule.h",
     ]
   }
-  if (is_clang) {
+  if (is_clang && !is_wasm) {
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
   if (is_win && is_clang) {
@@ -329,17 +329,21 @@ static_library("owt_sdk_p2p") {
     "sdk/p2p/p2psignalingsenderimpl.cc",
     "sdk/p2p/p2psignalingsenderimpl.h",
   ]
-  if (is_clang) {
+  if (is_clang && !is_wasm) {
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }
 
-wasm_lib("owt_wasm") {
-  name = "owt"
-  deps = [ "//third_party/webrtc/modules/rtp_rtcp" ]
-  sources=[
-    "sdk/wasm/main.cc",
-  ]
+if (is_wasm) {
+  wasm_lib("owt_wasm") {
+    name = "owt"
+    deps = [
+      "//third_party/webrtc/modules/rtp_rtcp:rtp_rtcp",
+      "//third_party/webrtc/rtc_base:rtc_json",
+      "//third_party/boringssl",
+    ]
+    sources = [ "sdk/wasm/main.cc" ]
+  }
 }
 
 static_library("owt_sdk_conf") {
@@ -366,7 +370,7 @@ static_library("owt_sdk_conf") {
     "sdk/include/cpp/owt/conference/remotemixedstream.h",
     "sdk/include/cpp/owt/conference/user.h",
   ]
-  if (is_clang) {
+  if (is_clang && !is_wasm) {
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 

talk/owt/sdk/wasm/gn/BUILD.gn

@@ -65,15 +65,15 @@ template("gcc_like_toolchain") {
 
     tool("cc") {
       depfile = "{{output}}.d"
-      command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -fno-stack-protector ${external_cflags} -msimd128 -pthread -D__wasm__ -c {{source}} -o {{output}}"
+      command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -fno-stack-protector ${external_cflags} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       outputs = [ "$object_subdir/{{source_name_part}}.o" ]
       description = "compile {{source}}"
     }
 
     tool("cxx") {
       depfile = "{{output}}.d"
-      command = "$cc_wrapper $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -fno-stack-protector ${external_cflags} -msimd128 -pthread -D__wasm__ ${external_cxxflags} -c {{source}} -o {{output}}"
+      command = "$cc_wrapper $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -fno-stack-protector ${external_cflags} ${external_cxxflags} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       outputs = [ "$object_subdir/{{source_name_part}}.o" ]
       description = "compile {{source}}"
@@ -173,8 +173,8 @@ gcc_like_toolchain("wasm") {
   # emsdk_dir and em_config are defined in wasm.gni.
   cpu = host_cpu
   os = host_os
-  ar = "emar --em-config $em_config"
-  cc = "emcc --em-config $em_config"
-  cxx = "em++ --em-config $em_config"
+  ar = "$emsdk_dir/emscripten/emar --em-config $em_config"
+  cc = "$emsdk_dir/emscripten/emcc --em-config $em_config"
+  cxx = "$emsdk_dir/emscripten/em++ --em-config $em_config"
   strip = ""
 }

talk/owt/sdk/wasm/gn/BUILDCONFIG.gn

@@ -23,7 +23,7 @@ import("wasm_vars.gni")
 
 # Used by //gn/standalone/toolchain/BUILD.gn .
 em_config = rebase_path("/home/jianjunz/code/emsdk/.emscripten", "")
-emsdk_dir = rebase_path("//buildtools/linux64/emsdk", "")
+emsdk_dir = rebase_path("/home/jianjunz/code/emsdk/upstream", "")
 
 # Defines a WASM library target.
 # Args:

talk/owt/sdk/wasm/gn/wasm.gni

@@ -17,4 +17,4 @@
 # limitations under the License.
 
 wasm_toolchain = "//talk/owt/sdk/wasm/gn:wasm"
-is_wasm = current_toolchain == wasm_toolchain
+# is_wasm = current_toolchain == wasm_toolchain