[javascript] Disable stack trace logging when TI_EMSCRIPTENED (JS 9/n) (

#4117)

taichi/system/traceback.cpp

@@ -15,8 +15,8 @@
 #include <mutex>
 #include "spdlog/fmt/bundled/color.h"
 
-#if defined(__APPLE__) || \
-    (defined(__unix__) && !defined(__linux__)) && !defined(ANDROID)
+#if defined(__APPLE__) || (defined(__unix__) && !defined(__linux__)) && \
+                              !defined(ANDROID) && !defined(TI_EMSCRIPTENED)
 #include <execinfo.h>
 #include <cxxabi.h>
 #endif
@@ -308,6 +308,12 @@ void print_traceback() {
   fmt::print(fg(fmt::color::magenta), "* Taichi Compiler Stack Traceback *\n");
   fmt::print(fg(fmt::color::magenta), "***********************************\n");
   fmt::print(fg(fmt::color::magenta), "NOT SUPPORTED ON ANDROID\n");
+#elif defined(TI_EMSCRIPTENED)
+  // Not supported
+  fmt::print(fg(fmt::color::magenta), "***********************************\n");
+  fmt::print(fg(fmt::color::magenta),
+             "* Emscriptened Taichi Compiler Stack Traceback *\n");
+  fmt::print(fg(fmt::color::magenta), "***********************************\n");
 #else
   // Based on http://man7.org/linux/man-pages/man3/backtrace.3.html
   constexpr int BT_BUF_SIZE = 1024;