Resolve x64 libc++ being included with linux-arm64 to browser-wasm cross-compiler (#93027)

* Resolve x64 libc++ being included with linux-arm64 to browser-wasm cross-compilers, due to incorrect assumption that the build architecture should be used for wasm cases.

Closes: #93015

Author: directhex

src/mono/mono.proj

@@ -254,9 +254,10 @@
 
   <!-- Mono runtime build -->
   <Target Name="BuildMonoRuntime">
-    <PropertyGroup>
-      <_MonoLLVMTargetArchitecture Condition="'$(TargetArchitecture)' == 'wasm' and '$(MonoUseLLVMPackage)' == 'true'">$(BuildArchitecture)</_MonoLLVMTargetArchitecture>
-      <_MonoLLVMTargetArchitecture Condition="'$(TargetArchitecture)' != 'wasm' and '$(MonoUseLLVMPackage)' == 'true'">$(TargetArchitecture)</_MonoLLVMTargetArchitecture>
+    <PropertyGroup Condition="'$(MonoUseLLVMPackage)' == 'true'">
+      <_MonoLLVMTargetArchitecture Condition="'$(TargetArchitecture)' == 'wasm'">$(BuildArchitecture)</_MonoLLVMTargetArchitecture>
+      <_MonoLLVMTargetArchitecture Condition="'$(TargetArchitecture)' != 'wasm'">$(TargetArchitecture)</_MonoLLVMTargetArchitecture>
+      <_MonoLLVMHostArchitecture Condition="'$(AotHostArchitecture)' != ''">$(AotHostArchitecture)</_MonoLLVMHostArchitecture>
     </PropertyGroup>
     <ItemGroup>
       <_MonoCMakeArgs Condition="'$(_MonoUseNinja)' == 'true'" Include="-G Ninja"/>
@@ -698,14 +699,14 @@
       <MonoAotOffsetsPrefix Condition="'$(Platform)' == 'arm64'">$(MonoCrossDir)/usr/lib/gcc/aarch64-linux-gnu/5</MonoAotOffsetsPrefix>
     </PropertyGroup>
 
-    <PropertyGroup>
-      <_MonoLLVMTargetArchitecture Condition="'$(MonoUseLLVMPackage)' == 'true'">$(BuildArchitecture)</_MonoLLVMTargetArchitecture>
-      <_MonoLLVMTargetArchitecture Condition="'$(MonoUseLLVMPackage)' == 'true'">$(AotHostArchitecture)</_MonoLLVMTargetArchitecture>
+    <PropertyGroup Condition="'$(MonoUseLLVMPackage)' == 'true'">
+      <_MonoLLVMTargetArchitecture>$(TargetArchitecture)</_MonoLLVMTargetArchitecture>
+      <_MonoLLVMHostArchitecture>$(AotHostArchitecture)</_MonoLLVMHostArchitecture>
     </PropertyGroup>
 
     <ItemGroup Condition="'$(HostOS)' == 'Linux' and (('$(MonoAOTEnableLLVM)' == 'true' and '$(MonoUseLibCxx)' == 'true') or '$(TargetArchitecture)' == 'wasm')">
-      <_MonoAOTCXXFLAGS Include="-I$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\include\c++\v1" />
-      <_MonoAOTCXXFLAGS Include="-L$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\lib" />
+      <_MonoAOTCXXFLAGS Include="-I$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\include\c++\v1" />
+      <_MonoAOTCXXFLAGS Include="-L$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\lib" />
       <_MonoAOTCXXFLAGS Include="-stdlib=libc++" />
       <MonoAOTCMakeArgs Include="-DMONO_SET_RPATH_ORIGIN=true" />
     </ItemGroup>
@@ -854,7 +855,7 @@
       <!-- Link in only the components neeeded for AOT compilation -->
       <MonoAOTCMakeArgs Include="-DAOT_COMPONENTS=1 -DSTATIC_COMPONENTS=1;" />
       <MonoAOTCMakeArgs Condition="'$(MonoAotOffsetsFile)' != ''" Include="-DAOT_OFFSETS_FILE=&quot;$(MonoAotOffsetsFile)&quot;" />
-      <MonoAOTCMakeArgs Condition="'$(MonoAOTEnableLLVM)' == 'true'" Include="-DLLVM_PREFIX=$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)" />
+      <MonoAOTCMakeArgs Condition="'$(MonoAOTEnableLLVM)' == 'true'" Include="-DLLVM_PREFIX=$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)" />
       <MonoAOTCMakeArgs Include="$(_MonoAOTCFLAGSOption)" />
       <MonoAOTCMakeArgs Include="$(_MonoAOTCXXFLAGSOption)" />
       <!-- thread suspend -->
@@ -946,8 +947,7 @@
       <_MonoAotCrossPdbFilePath>$(MonoObjCrossDir)out\bin\$(MonoAotCrossPdbFileName)</_MonoAotCrossPdbFilePath>
     </PropertyGroup>
     <PropertyGroup>
-      <_MonoLLVMTargetArchitecture>$(BuildArchitecture)</_MonoLLVMTargetArchitecture>
-      <_MonoLLVMTargetArchitecture Condition="'$(TargetArchitecture)' != 'wasm'">$(AotHostArchitecture)</_MonoLLVMTargetArchitecture>
+      <_MonoLLVMHostArchitecture>$(AotHostArchitecture)</_MonoLLVMHostArchitecture>
     </PropertyGroup>
 
     <!-- Copy Mono runtime files to artifacts directory -->
@@ -987,25 +987,25 @@
       <_MonoRuntimeArtifacts Condition="'$(HostOS)' == 'Linux' and ('$(MonoBundleLLVMOptimizer)' == 'true' or '$(MonoEnableLLVM)' == 'true') and '$(TargetArchitecture)' != 'wasm' and '$(MonoUseLibCxx)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\lib\libc++abi.so.1">
         <Destination>$(RuntimeBinDir)libc++abi.so.1</Destination>
       </_MonoRuntimeArtifacts>
-      <_MonoRuntimeArtifacts Condition="'$(HostOS)' == 'Linux' and ((('$(MonoAOTBundleLLVMOptimizer)' == 'true' or '$(MonoAOTEnableLLVM)' == 'true') and '$(MonoUseLibCxx)' == 'true') or '$(TargetArchitecture)' == 'wasm')" Include="$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\lib\libc++.so.1">
+      <_MonoRuntimeArtifacts Condition="'$(HostOS)' == 'Linux' and ((('$(MonoAOTBundleLLVMOptimizer)' == 'true' or '$(MonoAOTEnableLLVM)' == 'true') and '$(MonoUseLibCxx)' == 'true') or '$(TargetArchitecture)' == 'wasm')" Include="$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\lib\libc++.so.1">
         <Destination>$(RuntimeBinDir)cross\$(OutputRID)\libc++.so.1</Destination>
       </_MonoRuntimeArtifacts>
-      <_MonoRuntimeArtifacts Condition="'$(HostOS)' == 'Linux' and ((('$(MonoAOTBundleLLVMOptimizer)' == 'true' or '$(MonoAOTEnableLLVM)' == 'true') and '$(MonoUseLibCxx)' == 'true') or '$(TargetArchitecture)' == 'wasm')" Include="$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\lib\libc++abi.so.1">
+      <_MonoRuntimeArtifacts Condition="'$(HostOS)' == 'Linux' and ((('$(MonoAOTBundleLLVMOptimizer)' == 'true' or '$(MonoAOTEnableLLVM)' == 'true') and '$(MonoUseLibCxx)' == 'true') or '$(TargetArchitecture)' == 'wasm')" Include="$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\lib\libc++abi.so.1">
         <Destination>$(RuntimeBinDir)cross\$(OutputRID)\libc++abi.so.1</Destination>
       </_MonoRuntimeArtifacts>
       <_MonoRuntimeArtifacts Include="$(_MonoAotCrossPdbFilePath)" Condition="Exists('$(_MonoAotCrossPdbFilePath)')">
         <Destination>$(RuntimeBinDir)cross\$(OutputRID)\$(MonoAotCrossPdbFileName)</Destination>
       </_MonoRuntimeArtifacts>
-      <_MonoRuntimeArtifacts Condition="'$(MonoBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\bin\llc$(ExeSuffix)">
+      <_MonoRuntimeArtifacts Condition="'$(MonoBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\bin\llc$(ExeSuffix)">
         <Destination>$(RuntimeBinDir)\llc$(ExeSuffix)</Destination>
       </_MonoRuntimeArtifacts>
-      <_MonoRuntimeArtifacts Condition="'$(MonoBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\bin\opt$(ExeSuffix)">
+      <_MonoRuntimeArtifacts Condition="'$(MonoBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\bin\opt$(ExeSuffix)">
         <Destination>$(RuntimeBinDir)\opt$(ExeSuffix)</Destination>
       </_MonoRuntimeArtifacts>
-      <_MonoRuntimeArtifacts Condition="'$(MonoAOTBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\bin\llc$(ExeSuffix)">
+      <_MonoRuntimeArtifacts Condition="'$(MonoAOTBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\bin\llc$(ExeSuffix)">
         <Destination>$(RuntimeBinDir)cross\$(OutputRID)\llc$(ExeSuffix)</Destination>
       </_MonoRuntimeArtifacts>
-      <_MonoRuntimeArtifacts Condition="'$(MonoAOTBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMTargetArchitecture)\bin\opt$(ExeSuffix)">
+      <_MonoRuntimeArtifacts Condition="'$(MonoAOTBundleLLVMOptimizer)' == 'true'" Include="$(MonoLLVMDir)\$(_MonoLLVMHostArchitecture)\bin\opt$(ExeSuffix)">
         <Destination>$(RuntimeBinDir)cross\$(OutputRID)\opt$(ExeSuffix)</Destination>
       </_MonoRuntimeArtifacts>
       <_MonoIncludeArtifacts Include="$(MonoObjDir)out\include\**" />