[wasm/wasi] Fix size regression (#95992)

* [wasm/wasi] Fix size regression

Blazor size regression was fixed by:

```
commit ec31705
Author: Ankit Jain <[email protected]>
Date:   Wed Dec 6 05:36:59 2023 -0500

    [wasm] Fix regressed file sizes for blazor (#92664)
```

.. but a subsequent PR created close to that undid some of the changes:

```
commit a128c15
Author: Ankit Jain <[email protected]>
Date:   Mon Dec 11 15:45:58 2023 -0500

    [wasm/wasi] Consolidate build targets (#95775)
```

Essentially, `-g` was being passed to the link, and compile-bc steps.

Found in dotnet/perf-autofiling-issues#25891 .

* [wasm] Add flag missed in the consolidate PR

Author: radical

src/mono/wasi/build/WasiApp.targets

@@ -190,6 +190,8 @@
       <_WasiClangCFlags Include="&quot;-I%(_WasmCommonIncludePaths.Identity)&quot;" />
       <_WasiClangCFlags Include="-I&quot;$(MicrosoftNetCoreAppRuntimePackRidNativeDir.Replace('\', '/'))include&quot;" />
 
+      <_WasiClangCFlags Include="-g" Condition="'$(WasmNativeDebugSymbols)' == 'true'" />
+
       <_WasiClangCFlags Condition="'@(WasiAfterRuntimeLoadedDeclarations)' != ''"
                          Include="-D WASI_AFTER_RUNTIME_LOADED_DECLARATIONS=&quot;@(WasiAfterRuntimeLoadedDeclarations, ' ')&quot;" />
       <_WasiClangCFlags Condition="'@(WasiAfterRuntimeLoadedCalls)' != ''"

src/mono/wasm/build/BrowserWasmApp.targets

@@ -31,7 +31,6 @@
     <WasmEnableLegacyJsInterop Condition="'$(WasmEnableLegacyJsInterop)' == ''">true</WasmEnableLegacyJsInterop>
     <WasmEnableJsInteropByValue Condition="'$(WasmEnableJsInteropByValue)' == '' and ( '$(WasmEnableThreads)' == 'true' or '$(MonoWasmBuildVariant)' == 'multithread' )">true</WasmEnableJsInteropByValue>
     <WasmEnableJsInteropByValue Condition="'$(WasmEnableJsInteropByValue)' == ''">false</WasmEnableJsInteropByValue>
-    <WasmNativeDebugSymbols Condition="'$(WasmNativeDebugSymbols)' == ''">true</WasmNativeDebugSymbols>
 
     <!-- Temporarily `false`, till sdk gets a fix for supporting the new file -->
     <WasmEmitSymbolMap Condition="'$(WasmEmitSymbolMap)' == '' and '$(RunAOTCompilation)' != 'true'">false</WasmEmitSymbolMap>
@@ -288,7 +287,7 @@
 
       <_EmccCommonFlags Include="$(_DefaultEmccFlags)" />
       <_EmccCommonFlags Include="$(EmccFlags)" />
-      <_EmccCommonFlags Include="-g"                                       Condition="'$(WasmNativeDebugSymbols)' == 'true'" />
+      <_EmccCommonFlags Include="-g"                                       Condition="'$(WasmNativeStrip)' == 'false'" />
       <_EmccCommonFlags Include="-v"                                       Condition="'$(EmccVerbose)' != 'false'" />
       <_EmccCommonFlags Include="-s DISABLE_EXCEPTION_CATCHING=0"          Condition="'$(WasmEnableExceptionHandling)' == 'false'" />
       <_EmccCommonFlags Include="-fwasm-exceptions"                        Condition="'$(WasmEnableExceptionHandling)' == 'true'" />
@@ -317,11 +316,12 @@
       <_EmccCFlags Include="-emit-llvm" />
 
       <_EmccCFlags Include="&quot;-I%(_EmccIncludePaths.Identity)&quot;" />
+      <_EmccCFlags Include="-g"                                Condition="'$(WasmNativeDebugSymbols)' == 'true'" />
 
       <!-- Adding optimization flag at the top, so it gets precedence -->
       <_EmccLDFlags Include="$(WasmLinkOptimizationFlag)" />
       <_EmccLDFlags Include="@(_EmccCommonFlags)" />
-      <_EmccLDFlags Include="-s EXPORT_ES6=1" />
+      <_EmccLDFlags Include="-s EXPORT_ES6=1 -lexports.js" />
       <_EmccLDFlags Condition="'$(WasmEnableExceptionHandling)' != 'false'" Include="-s EXPORT_EXCEPTION_HANDLING_HELPERS=1"   />
 
       <_RuntimeCDependencies Include="$(_WasmPInvokeHPath);$(_WasmICallTablePath)" />

src/mono/wasm/build/WasmApp.Common.targets

@@ -117,7 +117,6 @@
       $(PrepareInputsForWasmBuildDependsOn);
       _SetupToolchain;
       _SetWasmBuildNativeDefaults;
-      _SetWasmNativeStripDefault;
       _GetDefaultWasmAssembliesToBundle;
       _WasmGetRuntimeConfigPath;
       _ReadWasmProps;
@@ -516,7 +515,6 @@
 
       <WasmBuildNative Condition="'$(WasmBuildNative)' == '' and @(NativeFileReference->Count()) > 0" >true</WasmBuildNative>
       <WasmBuildNative Condition="'$(WasmBuildNative)' == '' and '$(WasmSingleFileBundle)' == 'true'">true</WasmBuildNative>
-      <WasmBuildNative Condition="'$(WasmBuildNative)' == ''">false</WasmBuildNative>
     </PropertyGroup>
 
     <!-- When Publishing -->
@@ -531,15 +529,20 @@
 
       <!-- default to relinking in Release config -->
       <WasmBuildNative Condition="'$(WasmBuildNative)' == '' and '$(Configuration)' == 'Release'">true</WasmBuildNative>
+    </PropertyGroup>
 
+    <PropertyGroup>
       <WasmBuildNative Condition="'$(WasmBuildNative)' == ''">false</WasmBuildNative>
     </PropertyGroup>
-  </Target>
 
-  <Target Name="_SetWasmNativeStripDefault" Condition="'$(WasmNativeStrip)' == ''">
+    <!-- Default with nothing set: Build+relink+config=debug -->
+    <PropertyGroup Condition="'$(WasmNativeDebugSymbols)' == '' and '$(WasmNativeStrip)' == '' and '$(WasmBuildingForNestedPublish)' != 'true' and '$(WasmBuildNative)' == 'true' and '$(Configuration)' == 'Debug'">
+      <WasmNativeDebugSymbols>true</WasmNativeDebugSymbols>
+      <WasmNativeStrip>false</WasmNativeStrip>
+    </PropertyGroup>
+
     <PropertyGroup>
-      <!-- Build+relink+config=debug -->
-      <WasmNativeStrip Condition="'$(WasmBuildingForNestedPublish)' != 'true' and '$(WasmBuildNative)' == 'true' and '$(Configuration)' == 'Debug'">false</WasmNativeStrip>
+      <WasmNativeDebugSymbols Condition="'$(WasmNativeDebugSymbols)' == ''">true</WasmNativeDebugSymbols>
       <WasmNativeStrip Condition="'$(WasmNativeStrip)' == ''">true</WasmNativeStrip>
     </PropertyGroup>
   </Target>