From 8fa1402b1fc05bced4490fe555b4f11d75bf749f Mon Sep 17 00:00:00 2001
From: Chris Rummel <crummel@microsoft.com>
Date: Mon, 19 Sep 2022 15:56:42 -0500
Subject: [PATCH 1/2] Enable binlog in source-build bootstrap run.

---
 eng/SourceBuild.props | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eng/SourceBuild.props b/eng/SourceBuild.props
index 949c084ed77..b64d55ec24d 100644
--- a/eng/SourceBuild.props
+++ b/eng/SourceBuild.props
@@ -24,7 +24,7 @@
           BeforeTargets="RunInnerSourceBuildCommand">
 
     <Exec
-      Command="./build.sh --bootstrap --skipBuild"
+      Command="./build.sh --bootstrap --skipBuild -bl"
       WorkingDirectory="$(InnerSourceBuildRepoRoot)"
       EnvironmentVariables="@(InnerBuildEnv);DotNetBuildFromSource=true" />
   </Target>

From 9c51ee309380b975fd314209857f9714da3daa00 Mon Sep 17 00:00:00 2001
From: Chris Rummel <crummel@microsoft.com>
Date: Mon, 19 Sep 2022 16:08:54 -0500
Subject: [PATCH 2/2] Add comments on how this works.

---
 eng/SourceBuild.props | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/eng/SourceBuild.props b/eng/SourceBuild.props
index b64d55ec24d..0be49467823 100644
--- a/eng/SourceBuild.props
+++ b/eng/SourceBuild.props
@@ -23,6 +23,13 @@
           DependsOnTargets="PrepareInnerSourceBuildRepoRoot"
           BeforeTargets="RunInnerSourceBuildCommand">
 
+    <!-- this runs the source-build bootstrap path as described in https://github.com/dotnet/fsharp/blob/95df49e380ea8dbf33653fa4209f89dba29413f5/eng/build.sh#L247
+         Note that we *are not* passing -source-build here so we do this bootstrap build in the outer build.
+         the important parts here are:
+         -bootstrap will build the "Proto" config of F# which includes tools and a bootstrap compiler
+         -skipBuild skips the rest of the build
+         -bl enables the binlogs for the tools and Proto builds, which make debugging failures here easier
+    -->
     <Exec
       Command="./build.sh --bootstrap --skipBuild -bl"
       WorkingDirectory="$(InnerSourceBuildRepoRoot)"