Merge pull request #65745 from akien-mga/scons-production-lto-earlier

Refactor handling of `production` flag and per-platform LTO defaults

platform/ios/detect.py

@@ -39,9 +39,6 @@ def get_flags():
         ("arch", "arm64"),  # Default for convenience.
         ("tools", False),
         ("use_volk", False),
-        # Disable by default even if production is set, as it makes linking in Xcode
-        # on exports very slow and that's not what most users expect.
-        ("lto", "none"),
     ]
 
 
@@ -73,7 +70,11 @@ def configure(env):
         env.Append(CCFLAGS=["-gdwarf-2", "-O0"])
         env.Append(CPPDEFINES=["_DEBUG", ("DEBUG", 1)])
 
-    # LTO
+    ## LTO
+
+    if env["lto"] == "auto":  # Disable by default as it makes linking in Xcode very slow.
+        env["lto"] = "none"
+
     if env["lto"] != "none":
         if env["lto"] == "thin":
             env.Append(CCFLAGS=["-flto=thin"])