SERVER-76006 make compile half stream for smaller systems

1 files changed, 35 insertions, 0 deletions

diff --git a/SConstruct b/SConstruct
index 5244cc566db..339492823a5 100644
--- a/SConstruct
+++ b/SConstruct
@@ -6427,6 +6427,41 @@ if env.get('UNITTESTS_COMPILE_CONCURRENCY'):
         source_file_regex=r"^.*_test\.cpp$",
     )
 
+first_half_flag = False
+
+
+def half_source_emitter(target, source, env):
+    global first_half_flag
+    if first_half_flag:
+        first_half_flag = False
+        if not str(source[0]).endswith('_test.cpp'):
+            env.Alias('compile_first_half_non_test_source', target)
+    else:
+        first_half_flag = True
+    return target, source
+
+
+# Cribbed from Tool/cc.py and Tool/c++.py. It would be better if
+# we could obtain this from SCons.
+_CSuffixes = [".c"]
+if not SCons.Util.case_sensitive_suffixes(".c", ".C"):
+    _CSuffixes.append(".C")
+
+_CXXSuffixes = [".cpp", ".cc", ".cxx", ".c++", ".C++"]
+if SCons.Util.case_sensitive_suffixes(".c", ".C"):
+    _CXXSuffixes.append(".C")
+
+for object_builder in SCons.Tool.createObjBuilders(env):
+    emitterdict = object_builder.builder.emitter
+    for suffix in emitterdict.keys():
+        if not suffix in _CSuffixes + _CXXSuffixes:
+            continue
+        base = emitterdict[suffix]
+        emitterdict[suffix] = SCons.Builder.ListEmitter([
+            base,
+            half_source_emitter,
+        ])
+
 # Keep this late in the game so that we can investigate attributes set by all the tools that have run.
 if has_option("cache"):
     if get_option("cache") == "nolinked":