Disable exception handling codegen for Emscripten DEBUG build config.

Urho3D library does not use C++ exceptions feature. Emscripten already disables exception handling by default for -O1 and above.

.travis.yml

@@ -427,7 +427,7 @@ before_script:
   - git clone --depth 1 --branch $EMSCRIPTEN_BRANCH https://github.com/urho3d/emscripten-sdk.git && emscripten-sdk/emsdk activate --build=Release sdk-${EMSCRIPTEN_BRANCH}-64bit $BINARYEN && source emscripten-sdk/emsdk_env.sh
   - export PATH=$(whereis -b ccache |grep -o '\S*lib\S*'):$PATH; for f in $EMSCRIPTEN/{emcc,em++}; do touch -d "2015-09-01 00:00:00 +0800" $f; done
   - rake ci_setup_cache
-script: rake ci && if [[ "$TRAVIS_BRANCH" == "Web-CI" ]] && [[ ! $EMSCRIPTEN_WASM ]] && [[ "$TRAVIS_PULL_REQUEST" == "false" ]] && [[ "$URHO3D_LIB_TYPE" == "MODULE" ]]; then rake ci_emscripten_samples_update; fi && if [ $PACKAGE_UPLOAD ]; then rake ci_package_upload; fi && rake ci_timer
+script: rake ci && if [[ "$TRAVIS_BRANCH" == "Web-CI" ]] && [[ ! $EMSCRIPTEN_WASM ]] && [[ "$TRAVIS_PULL_REQUEST" == "false" ]] && [[ "$URHO3D_LIB_TYPE" == "SHARED" ]]; then rake ci_emscripten_samples_update; fi && if [ $PACKAGE_UPLOAD ]; then rake ci_package_upload; fi && rake ci_timer
 after_script: rake ci_teardown_cache
 
 ---

CMake/Modules/UrhoCommon.cmake

@@ -635,8 +635,10 @@ else ()
                 endif ()
                 set (CMAKE_C_FLAGS_RELEASE "-Oz -DNDEBUG")
                 set (CMAKE_CXX_FLAGS_RELEASE "-Oz -DNDEBUG")
-                set (CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} -O3 -s AGGRESSIVE_VARIABLE_ELIMINATION=1")     # Remove variables to make the -O3 regalloc easier
-                set (CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -g4")     # Preserve LLVM debug information, show line number debug comments, and generate source maps
+                # Remove variables to make the -O3 regalloc easier
+                set (CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} -O3 -s AGGRESSIVE_VARIABLE_ELIMINATION=1")
+                # Preserve LLVM debug information, show line number debug comments, and generate source maps; always disable exception handling codegen
+                set (CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -g4 -s DISABLE_EXCEPTION_CATCHING=1")
             endif ()
         elseif (MINGW)
             # MinGW-specific setup