Get exceptions working as they were before.

This no longer uses headers from libcxxabi and
in fact uses libcxxabi a bit less than before.

This no longer lets some new C++11 stuff such as
exception_ptr work as the support for that relies
upon libcxxabi code.

emcc

@@ -1102,6 +1102,7 @@ try:
       o_s = []
       libc_files = [
         'dlmalloc.c',
+        os.path.join('libcxx', 'new.cpp'),
         os.path.join('libc', 'stdlib', 'getopt_long.c'),
         os.path.join('libc', 'gen', 'err.c'),
         os.path.join('libc', 'gen', 'errx.c'),
@@ -1165,8 +1166,7 @@ try:
         'ios.cpp',
         'locale.cpp',
         'regex.cpp',
-        'strstream.cpp',
-        'typeinfo.cpp'
+        'strstream.cpp'
       ]
       for src in libcxx_files:
         o = in_temp(src + '.o')
@@ -1189,14 +1189,8 @@ try:
       if DEBUG: print >> sys.stderr, 'emcc: building libcxxabi for cache'
       os = []
       libcxxabi_files = [
-        'abort_message.cpp',
-        'private_typeinfo.cpp',
         'typeinfo.cpp',
-        'cxa_new_delete.cpp',
-        'cxa_handlers.cpp',
-        'stdexcept.cpp',
-        'exception.cpp',
-        'cxa_exception_storage.cpp']:
+        'private_typeinfo.cpp'
       ]
       for src in libcxxabi_files:
         o = in_temp(src + '.o')

system/lib/libc.symbols

@@ -1,3 +1,33 @@
+_ZNKSt20bad_array_new_length4whatEv
+_ZNKSt9bad_alloc4whatEv
+_ZNSt20bad_array_new_lengthC1Ev
+_ZNSt20bad_array_new_lengthC2Ev
+_ZNSt20bad_array_new_lengthD0Ev
+_ZNSt20bad_array_new_lengthD1Ev
+_ZNSt20bad_array_new_lengthD2Ev
+_ZNSt9bad_allocC1Ev
+_ZNSt9bad_allocC2Ev
+_ZNSt9bad_allocD0Ev
+_ZNSt9bad_allocD1Ev
+_ZNSt9bad_allocD2Ev
+_ZSt15get_new_handlerv
+_ZSt15set_new_handlerPFvvE
+_ZSt17__throw_bad_allocv
+_ZSt7nothrow
+_ZTISt20bad_array_new_length
+_ZTISt9bad_alloc
+_ZTSSt20bad_array_new_length
+_ZTSSt9bad_alloc
+_ZTVSt20bad_array_new_length
+_ZTVSt9bad_alloc
+_ZdaPv
+_ZdaPvRKSt9nothrow_t
+_ZdlPv
+_ZdlPvRKSt9nothrow_t
+_Znaj
+_ZnajRKSt9nothrow_t
+_Znwj
+_ZnwjRKSt9nothrow_t
 _err
 _errx
 _verr

system/lib/libcxx/exception.cpp

@@ -77,6 +77,7 @@ get_terminate() _NOEXCEPT
     return __sync_fetch_and_add(&__terminate_handler, (terminate_handler)0);
 }
 
+#ifndef EMSCRIPTEN // We provide this in JS
 _LIBCPP_NORETURN
 void
 terminate() _NOEXCEPT
@@ -97,9 +98,10 @@ terminate() _NOEXCEPT
     }
 #endif  // _LIBCPP_NO_EXCEPTIONS
 }
+#endif // !EMSCRIPTEN
 #endif // !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION)
 
-#if !defined(LIBCXXRT) && !defined(__GLIBCXX__)
+#if !defined(LIBCXXRT) && !defined(__GLIBCXX__) && !defined(EMSCRIPTEN)
 bool uncaught_exception() _NOEXCEPT
 {
 #if __APPLE__ || defined(_LIBCPPABI_VERSION)