SCons: Add DEV_ENABLED defines for target=debug builds

This will allow adding developer checks which will be fully compiled out in
user builds, unlike `DEBUG_ENABLED` which is included in debug tempates and
the editor builds.

This define is not used yet, but we'll soon add code that uses it, and change
some existing `DEBUG_ENABLED` checks to be performed only in dev builds.

Related to https://github.com/godotengine/godot-proposals/issues/3371.

platform/android/detect.py

@@ -207,7 +207,7 @@ def configure(env):
     elif env["target"] == "debug":
         env.Append(LINKFLAGS=["-O0"])
         env.Append(CCFLAGS=["-O0", "-g", "-fno-limit-debug-info"])
-        env.Append(CPPDEFINES=["_DEBUG", "DEBUG_ENABLED"])
+        env.Append(CPPDEFINES=["_DEBUG", "DEBUG_ENABLED", "DEV_ENABLED"])
         env.Append(CPPFLAGS=["-UNDEBUG"])
 
     # Compiler configuration

platform/iphone/detect.py

@@ -62,7 +62,7 @@ def configure(env):
 
     elif env["target"] == "debug":
         env.Append(CCFLAGS=["-gdwarf-2", "-O0"])
-        env.Append(CPPDEFINES=["_DEBUG", ("DEBUG", 1), "DEBUG_ENABLED"])
+        env.Append(CPPDEFINES=["_DEBUG", ("DEBUG", 1), "DEBUG_ENABLED", "DEV_ENABLED"])
 
     if env["use_lto"]:
         env.Append(CCFLAGS=["-flto"])

platform/javascript/detect.py

@@ -81,6 +81,7 @@ def configure(env):
             env.Append(LINKFLAGS=["--profiling-funcs"])
     else:  # "debug"
         env.Append(CPPDEFINES=["DEBUG_ENABLED"])
+        env.Append(CPPDEFINES=["DEV_ENABLED"])
         env.Append(CCFLAGS=["-O1", "-g"])
         env.Append(LINKFLAGS=["-O1", "-g"])
         env["use_assertions"] = True

platform/osx/detect.py

@@ -66,6 +66,7 @@ def configure(env):
     elif env["target"] == "debug":
         env.Prepend(CCFLAGS=["-g3"])
         env.Prepend(CPPDEFINES=["DEBUG_ENABLED"])
+        env.Prepend(CPPDEFINES=["DEV_ENABLED"])
         env.Prepend(LINKFLAGS=["-Xlinker", "-no_deduplicate"])
 
     ## Architecture

platform/server/detect.py

@@ -74,6 +74,7 @@ def configure(env):
     elif env["target"] == "debug":
         env.Prepend(CCFLAGS=["-g3"])
         env.Prepend(CPPDEFINES=["DEBUG_ENABLED"])
+        env.Prepend(CPPDEFINES=["DEV_ENABLED"])
         env.Append(LINKFLAGS=["-rdynamic"])
 
     ## Architecture

platform/uwp/detect.py

@@ -71,6 +71,7 @@ def configure(env):
         env.Append(CCFLAGS=["/Zi"])
         env.Append(CCFLAGS=["/MDd"])
         env.Append(CPPDEFINES=["DEBUG_ENABLED"])
+        env.Append(CPPDEFINES=["DEV_ENABLED"])
         env.Append(LINKFLAGS=["/SUBSYSTEM:CONSOLE"])
         env.Append(LINKFLAGS=["/DEBUG"])
 

platform/windows/detect.py

@@ -199,6 +199,7 @@ def configure_msvc(env, manual_msvc_config):
     elif env["target"] == "debug":
         env.AppendUnique(CCFLAGS=["/Zi", "/FS", "/Od", "/EHsc"])
         env.AppendUnique(CPPDEFINES=["DEBUG_ENABLED"])
+        env.AppendUnique(CPPDEFINES=["DEV_ENABLED"])
         env.Append(LINKFLAGS=["/SUBSYSTEM:CONSOLE"])
         env.Append(LINKFLAGS=["/DEBUG"])
 
@@ -334,6 +335,7 @@ def configure_mingw(env):
     elif env["target"] == "debug":
         env.Append(CCFLAGS=["-g3"])
         env.Append(CPPDEFINES=["DEBUG_ENABLED"])
+        env.Append(CPPDEFINES=["DEV_ENABLED"])
 
     ## Compiler configuration
 

platform/x11/detect.py

@@ -113,6 +113,7 @@ def configure(env):
         env.Prepend(CCFLAGS=["-ggdb"])
         env.Prepend(CCFLAGS=["-g3"])
         env.Prepend(CPPDEFINES=["DEBUG_ENABLED"])
+        env.Prepend(CPPDEFINES=["DEV_ENABLED"])
         env.Append(LINKFLAGS=["-rdynamic"])
 
     ## Architecture