SERVER-49466 Introduce a flag to opt in to newer mongodb SCons tools as a groupr4.4.1-rc0

(cherry picked from commit c40e96ea0b650402af0b52bd6a70f5ea67464054)

2 files changed, 18 insertions, 6 deletions

diff --git a/SConstruct b/SConstruct
index da262bd2575..47b553a1649 100644
--- a/SConstruct
+++ b/SConstruct
@@ -117,6 +117,13 @@ add_option('prefix',
     help='installation prefix (conficts with DESTDIR, PREFIX, and --install-mode=hygienic)',
 )
 
+add_option('build-tools',
+    choices=['stable', 'next'],
+    default='stable',
+    type='choice',
+    help='Enable experimental build tools',
+)
+
 add_option('legacy-tarball',
     choices=['true', 'false'],
     default='false',
@@ -1112,6 +1119,13 @@ if get_option('install-mode') != 'hygienic':
     envDict["LIBFUZZER_TEST_ALIAS"] = "libfuzzer_tests"
     envDict["BENCHMARK_ALIAS"] = "benchmarks"
 
+# By default, we will get the normal SCons tool search. But if the
+# user has opted into the next gen tools, add our experimental tool
+# directory into the default toolpath, ahead of whatever is already in
+# there so it overrides it.
+if get_option('build-tools') == 'next' or get_option('ninja') == 'next':
+    SCons.Tool.DefaultToolpath.insert(0, os.path.abspath('site_scons/site_tools/next'))
+
 env = Environment(variables=env_vars, **envDict)
 
 # Only print the spinner if stdout is a tty
@@ -3902,11 +3916,8 @@ if get_option('ninja') != 'disabled':
         if env['ICECREAM_VERSION'] < parse_version("1.2"):
             env.FatalError("Use of ccache is mandatory with --ninja and icecream older than 1.2. You are running {}.".format(env['ICECREAM_VERSION']))
 
-    if get_option('ninja') == 'stable':
-        ninja_builder = Tool("ninja")
-        ninja_builder.generate(env)
-    else:
-        ninja_builder = Tool("ninja_next")
+    ninja_builder = Tool("ninja")
+    if get_option('build-tools') == 'next' or get_option('ninja') == 'next':
         env["NINJA_BUILDDIR"] = env.Dir("$BUILD_DIR/ninja")
         ninja_builder.generate(env)
 
@@ -3915,7 +3926,8 @@ if get_option('ninja') != 'disabled':
         })
         env['NINJA_COMPDB_EXPAND'] = ninjaConf.CheckNinjaCompdbExpand()
         ninjaConf.Finish()
-
+    else:
+        ninja_builder.generate(env)
 
     # idlc.py has the ability to print it's implicit dependencies
     # while generating, Ninja can consume these prints using the
diff --git a/site_scons/site_tools/ninja_next.py b/site_scons/site_tools/next/ninja.py
index aff20498b60..aff20498b60 100644
--- a/site_scons/site_tools/ninja_next.py
+++ b/site_scons/site_tools/next/ninja.py