Update IBC source branch names (#2931)

mmitche · web-flow · commit 03ebd38e3fd6 · 2025-10-15T11:07:09.000-07:00
diff --git a/repo-projects/msbuild.proj b/repo-projects/msbuild.proj
@@ -15,8 +15,7 @@
   </ItemGroup>
 
   <PropertyGroup Condition="'$(BuildOS)' == 'windows' and '$(OfficialBuildId)' != '' and '$(EnableIBCOptimization)' == 'true'">
-    <!-- Main is probably going to need to be changed https://github.com/dotnet/source-build/issues/4843 -->
-    <BuildArgs>$(BuildArgs) /p:VisualStudioIbcSourceBranchName=main</BuildArgs>
+    <BuildArgs>$(BuildArgs) /p:VisualStudioIbcSourceBranchName=vs18.0</BuildArgs>
     <BuildArgs>$(BuildArgs) /p:VisualStudioDropAccessToken=$(IBCDropAccessToken)</BuildArgs>
     <!-- This is set to the name of the repository that msbuild builds its official build from. -->
     <BuildArgs>$(BuildArgs) /p:VisualStudioIbcRepositoryName=DotNet-msbuild-Trusted</BuildArgs>
diff --git a/repo-projects/roslyn.proj b/repo-projects/roslyn.proj
@@ -20,8 +20,7 @@
     <BuildArgs Condition="'$(EnableIBCOptimization)' != 'true'">$(BuildArgs) $(FlagParameterPrefix)officialSourceBranchName placeholder</BuildArgs>
     <BuildArgs Condition="'$(EnableIBCOptimization)' != 'true'">$(BuildArgs) $(FlagParameterPrefix)officialVisualStudioDropAccessToken placeholder</BuildArgs>
     <BuildArgs Condition="'$(EnableIBCOptimization)' != 'true'">$(BuildArgs) $(FlagParameterPrefix)officialSkipApplyOptimizationData true</BuildArgs>
-    <!-- Main is probably going to need to be changed https://github.com/dotnet/source-build/issues/4843 -->
-    <BuildArgs Condition="'$(EnableIBCOptimization)' == 'true'">$(BuildArgs) $(FlagParameterPrefix)officialSourceBranchName main</BuildArgs>
+    <BuildArgs Condition="'$(EnableIBCOptimization)' == 'true'">$(BuildArgs) $(FlagParameterPrefix)officialSourceBranchName release/dev18.0</BuildArgs>
     <BuildArgs Condition="'$(EnableIBCOptimization)' == 'true'">$(BuildArgs) $(FlagParameterPrefix)officialVisualStudioDropAccessToken $(IBCDropAccessToken)</BuildArgs>
     <BuildArgs Condition="'$(EnableIBCOptimization)' == 'true'">$(BuildArgs) $(FlagParameterPrefix)officialSkipApplyOptimizationData false</BuildArgs>
     <BuildArgs Condition="'$(EnableIBCOptimization)' == 'true'">$(BuildArgs) /p:IgnoreIbcMergeErrors=true</BuildArgs>
