A temporary hack to deal with a bug in MSVC v142 - VS 2019 build tools

Author: josetr

.github/workflows/llvm.yml

@@ -40,6 +40,11 @@ jobs:
           )
           endlocal
 
+      - name: Fix intrin.h file
+        if: matrix.config.vs > 0
+        shell: powershell
+        run: build/intrin.ps1
+
       - name: Clone LLVM
         shell: bash
         run: build/premake.sh --file=build/scripts/LLVM.lua clone_llvm

.github/workflows/main.yml

@@ -30,6 +30,11 @@ jobs:
         shell: bash
         run: echo "/c/Program Files (x86)/Microsoft Visual Studio/$VS_VERSION/Enterprise/MSBuild/Current/Bin" >> $GITHUB_PATH
 
+      - name: Fix intrin.h file
+        if: matrix.config.vs > 0
+        shell: powershell
+        run: build/intrin.ps1
+
       - name: Setup
         shell: bash
         run: build/Setup.sh

build/intrin.ps1

@@ -0,0 +1,8 @@
+$intrin = 'C:/Program Files (x86)/Microsoft Visual Studio/2019/Enterprise/VC/Tools/MSVC/14.28.29333/include/intrin0.h'
+if (!(Test-Path $intrin)) {
+  Write-Warning "This hack is no longer needed and should be removed."
+}
+else {
+    $content = ((Get-Content $intrin) -replace 'ifdef __clang__', 'ifdef __avoid_this_path__')
+    [IO.File]::WriteAllLines($intrin, $content)
+}