Revert "Remove raspi-2 -fno-exception hack. (#1490)" (#1544)

This reverts commit 4a5738d.

Seems to be causing many raspi tests to fail.

b/219073252

build/config/compiler/BUILD.gn

@@ -1899,8 +1899,11 @@ config("no_exceptions") {
       defines = [ "_HAS_EXCEPTIONS=0" ]
     }
   } else {
+    # This hack ensures raspi does not compile anything with -fno-exceptions.
+    if (!defined(enable_exceptions_override) || !enable_exceptions_override) {
     cflags_cc = [ "-fno-exceptions" ]
     cflags_objcc = cflags_cc
+    }
   }
 }
 

starboard/nplb/BUILD.gn

@@ -231,7 +231,11 @@ target(gtest_target_type, "nplb") {
     "window_get_size_test.cc",
   ]
 
-  configs += [ "//starboard/build/config:starboard_implementation" ]
+  configs += [
+    "//build/config/compiler:exceptions",
+    "//starboard/build/config:starboard_implementation",
+  ]
+  configs -= [ "//build/config/compiler:no_exceptions" ]
 
   deps = [
     "//starboard",

starboard/raspi/shared/platform_configuration/configuration.gni

@@ -37,6 +37,9 @@ if (current_toolchain == default_toolchain &&
   speed_config_path = "//starboard/raspi/shared/platform_configuration:speed"
   size_config_path = "//starboard/raspi/shared/platform_configuration:size"
 
+  # TODO(b/219073252): Enable -fno-exceptions and don't mix it with -fexceptions.
+  enable_exceptions_override = true
+
   v8_enable_webassembly = true
 
   is_raspi = true

third_party/llvm-project/libcxxabi/BUILD.gn

@@ -23,6 +23,7 @@ config("cxxabi_config") {
     "-std=c++17",
     "-nostdinc++",
     "-fPIC",
+    "-fexceptions",
     "-frtti",
     "-Werror=return-type",
     "-fvisibility-inlines-hidden",
@@ -64,19 +65,11 @@ static_library("cxxabi") {
     "src/cxa_aux_runtime.cpp",
     "src/cxa_default_handlers.cpp",
     "src/cxa_demangle.cpp",
-
-    # Requires exception support
-    #"src/cxa_exception.cpp",
-
+    "src/cxa_exception.cpp",
     "src/cxa_exception_storage.cpp",
-
     "src/cxa_guard.cpp",
     "src/cxa_handlers.cpp",
-    "src/cxa_noexception.cpp",
-
-    # Requires exception support
-    #"src/cxa_personality.cpp",
-
+    "src/cxa_personality.cpp",
     "src/cxa_vector.cpp",
     "src/cxa_virtual.cpp",
     "src/fallback_malloc.cpp",
@@ -86,6 +79,9 @@ static_library("cxxabi") {
     "src/stdlib_stdexcept.cpp",
     "src/stdlib_typeinfo.cpp",
 
+    # src/cxa_noexception.cpp is omitted because this file breaks the build and
+    # we utilize exception handling.
+
     # src/cxa_thread_atexit.cpp is unneeded. It introduces
     # "__cxa_thread_atexit_impl" as an API leak.
   ]