Optimize build size: disable exceptions

    platform        | before | after
    ----------------+--------+------
    darwin-x64.node | 867K   | 826K
    linux-x64.node  | 858K   | 818K
    win32-ia32.node | 536K   | 486K
    win32-x64.node  | 692K   | 670K

Author: strager

.github/workflows/build-website.yml

@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: C++ configure
-        run: emcmake cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS='-Os -flto' -DCMAKE_CXX_FLAGS='-Os -fno-exceptions -flto'
+        run: emcmake cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS='-Os -flto' -DCMAKE_CXX_FLAGS='-Os -flto'
       - name: C++ build
         run: emmake cmake --build build --target quick-lint-js-vscode quick-lint-js-vscode-licenses
       - name: C++ install

cmake/QuickLintJSCompiler.cmake

@@ -64,8 +64,10 @@ endfunction ()
 
 function (quick_lint_js_configure_exception_handling)
   if (MSVC)
-    add_compile_options(/EHcs)
+    add_compile_options(/EHc-s-)
+    add_definitions(-D_HAS_EXCEPTIONS=0)
   endif ()
+  quick_lint_js_add_cxx_flag_if_supported(-fno-exceptions QUICK_LINT_JS_HAVE_FNO_EXCEPTIONS)
 endfunction ()
 
 # RTTI stands for Run-Time Type Information.