Try VS2019 GHA build

.github/workflows/msbuild.yml

@@ -20,9 +20,12 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Add MSBuild to PATH
-      uses: microsoft/setup-msbuild@v1
-      with:
-        vs-version: '12.0.40629.0'
+      uses: microsoft/[email protected]
+
+    - name: Enable VS2019
+      working-directory: sp/src/vpc_scripts
+      shell: bash
+      run: sed -i 's/^\($Conditional[ 	]\+VS2019[ 	]\+\).*/\1"1"/' default.vgc
 
     - name: Create projectfiles
       working-directory: sp/src
@@ -37,8 +40,13 @@ jobs:
       # Add additional options to the MSBuild command line here (like platform or verbosity level).
       # See https://docs.microsoft.com/visualstudio/msbuild/msbuild-command-line-reference
       shell: cmd
-      # call refreshenv
       run: |
+        msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} mathlib\mathlib.vcxproj
+        msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} raytrace\raytrace.vcxproj
+        msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} responserules\runtime\responserules.vcxproj
+        msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} tier1\tier1.vcxproj
+        msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} vgui2\vgui_controls\vgui_controls.vcxproj
+        msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} vscript\vscript.vcxproj
         msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} game\client\client_ntks.vcxproj
         msbuild -m -p:Configuration=${{env.BUILD_CONFIGURATION}} game\server\server_ntks.vcxproj
 

sp/src/public/tier0/memoverride.cpp

@@ -282,6 +282,9 @@ ALLOC_CALL void * __cdecl _recalloc ( void * memblock, size_t count, size_t size
 }
 
 size_t _msize_base( void *pMem )
+#if _MSC_VER >= 1925 //VS2019+
+	throw()
+#endif
 {
 	return g_pMemAlloc->GetSize(pMem);
 }