SCons: Add CPPEXTPATH for external includes

(cherry picked from commit 30bfa6f215)

tools/godotcpp.py

@@ -2,6 +2,7 @@ import os
 import platform
 import sys
 
+from SCons import __version__ as scons_raw_version
 from SCons.Action import Action
 from SCons.Builder import Builder
 from SCons.Errors import UserError
@@ -380,6 +381,8 @@ def options(opts, env):
 
 
 def generate(env):
+    env.scons_version = env._get_major_minor_revision(scons_raw_version)
+
     # Default num_jobs to local cpu count if not user specified.
     # SCons has a peculiarity where user-specified options won't be overridden
     # by SetOption, so we can rely on this to know if we should use our default.
@@ -437,6 +440,17 @@ def generate(env):
     else:  # Release
         opt_level = "speed"
 
+    # Allow marking includes as external/system to avoid raising warnings.
+    if env.scons_version < (4, 2):
+        env["_CPPEXTINCFLAGS"] = "${_concat(EXTINCPREFIX, CPPEXTPATH, EXTINCSUFFIX, __env__, RDirs, TARGET, SOURCE)}"
+    else:
+        env["_CPPEXTINCFLAGS"] = (
+            "${_concat(EXTINCPREFIX, CPPEXTPATH, EXTINCSUFFIX, __env__, RDirs, TARGET, SOURCE, affect_signature=False)}"
+        )
+    env["CPPEXTPATH"] = []
+    env["EXTINCPREFIX"] = "-isystem "
+    env["EXTINCSUFFIX"] = ""
+
     env["optimize"] = ARGUMENTS.get("optimize", opt_level)
     env["debug_symbols"] = get_cmdline_bool("debug_symbols", env.dev_build)
 

tools/windows.py

@@ -130,6 +130,11 @@ def generate(env):
         if env["silence_msvc"] and not env.GetOption("clean"):
             silence_msvc(env)
 
+        if not env["use_llvm"]:
+            env.AppendUnique(CCFLAGS=["/experimental:external", "/external:anglebrackets"])
+        env.AppendUnique(CCFLAGS=["/external:W0"])
+        env["EXTINCPREFIX"] = "/external:I"
+
     elif (sys.platform == "win32" or sys.platform == "msys") and not env["mingw_prefix"]:
         env["use_mingw"] = True
         mingw.generate(env)