Configure MSBuild debug path and save any logs

We have had many problems in the CI with MSBuild failing, and not
capturing the failure logs.

See https://github.com/dotnet/coreclr/issues/20236.

So, for all msbuild invocations, set MSBUILDDEBUGPATH to a new,
distinguished, subdirectory of the bin\Logs directory, named
"MsbuildDebugLogs". Change the CI to upload any log files found
there.

1 files changed, 8 insertions, 3 deletions

diff --git a/build.cmd b/build.cmd
index cc0345489d..dec253b5e3 100644
--- a/build.cmd
+++ b/build.cmd
@@ -58,6 +58,7 @@ set "__PackagesDir=%DotNetRestorePackagesPath%"
 if [%__PackagesDir%]==[] set "__PackagesDir=%__ProjectDir%\packages"
 set "__RootBinDir=%__ProjectDir%\bin"
 set "__LogsDir=%__RootBinDir%\Logs"
+set "__MsbuildDebugLogsDir=%__LogsDir%\MsbuildDebugLogs"
 
 set __BuildAll=
 
@@ -319,9 +320,13 @@ REM Generate path to be set for CMAKE_INSTALL_PREFIX to contain forward slash
 set "__CMakeBinDir=%__BinDir%"
 set "__CMakeBinDir=%__CMakeBinDir:\=/%"
 
-if not exist "%__BinDir%"           md "%__BinDir%"
-if not exist "%__IntermediatesDir%" md "%__IntermediatesDir%"
-if not exist "%__LogsDir%"          md "%__LogsDir%"
+if not exist "%__BinDir%"              md "%__BinDir%"
+if not exist "%__IntermediatesDir%"    md "%__IntermediatesDir%"
+if not exist "%__LogsDir%"             md "%__LogsDir%"
+if not exist "%__MsbuildDebugLogsDir%" md "%__MsbuildDebugLogsDir%"
+
+REM Set up the directory for MSBuild debug logs.
+set MSBUILDDEBUGPATH=%__MsbuildDebugLogsDir%
 
 REM It is convenient to have your Nuget search path include the location where the build
 REM will place packages.  However nuget used during the build will fail if that directory