SCons: Unify tools/target build type configuration

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

New `target` presets
====================

The `tools` option is removed and `target` changes to use three new presets,
which match the builds users are familiar with. These targets control the
default optimization level and enable editor-specific and debugging code:

- `editor`: Replaces `tools=yes target=release_debug`.
  * Defines: `TOOLS_ENABLED`, `DEBUG_ENABLED`, `-O2`/`/O2`
- `template_debug`: Replaces `tools=no target=release_debug`.
  * Defines: `DEBUG_ENABLED`, `-O2`/`/O2`
- `template_release`: Replaces `tools=no target=release`.
  * Defines: `-O3`/`/O2`

New `dev_build` option
======================

The previous `target=debug` is now replaced by a separate `dev_build=yes`
option, which can be used in combination with either of the three targets,
and changes the following:

- `dev_build`: Defines `DEV_ENABLED`, disables optimization (`-O0`/`/0d`),
  enables generating debug symbols, does not define `NDEBUG` so `assert()`
  works in thirdparty libraries, adds a `.dev` suffix to the binary name.

Note: Unlike previously, `dev_build` defaults to off so that users who
compile Godot from source get an optimized and small build by default.
Engine contributors should now set `dev_build=yes` in their build scripts or
IDE configuration manually.

Changed binary names
====================

The name of generated binaries and object files are changed too, to follow
this format:

`godot.<platform>.<target>[.dev][.double].<arch>[.<extra_suffix>][.<ext>]`

For example:
- `godot.linuxbsd.editor.dev.arm64`
- `godot.windows.template_release.double.x86_64.mono.exe`

Be sure to update your links/scripts/IDE config accordingly.

More flexible `optimize` and `debug_symbols` options
====================================================

The optimization level and whether to generate debug symbols can be further
specified with the `optimize` and `debug_symbols` options. So the default
values listed above for the various `target` and `dev_build` combinations
are indicative and can be replaced when compiling, e.g.:

`scons p=linuxbsd target=template_debug dev_build=yes optimize=debug`
will make a "debug" export template with dev-only code enabled, `-Og`
optimization level for GCC/Clang, and debug symbols. Perfect for debugging
complex crashes at runtime in an exported project.

3 files changed, 5 insertions, 8 deletions

diff --git a/modules/mono/SCsub b/modules/mono/SCsub
index 7764ba0b45..a4667f784d 100644
--- a/modules/mono/SCsub
+++ b/modules/mono/SCsub
@@ -26,6 +26,6 @@ if env["platform"] in ["macos", "ios"]:
 elif env["platform"] == "android":
     env_mono.add_source_files(env.modules_sources, "mono_gd/android_mono_config.gen.cpp")
 
-if env["tools"]:
+if env.editor_build:
     env_mono.add_source_files(env.modules_sources, "editor/*.cpp")
     SConscript("editor/script_templates/SCsub")
diff --git a/modules/mono/build_scripts/mono_configure.py b/modules/mono/build_scripts/mono_configure.py
index 5d63773096..5cec8f41f5 100644
--- a/modules/mono/build_scripts/mono_configure.py
+++ b/modules/mono/build_scripts/mono_configure.py
@@ -20,10 +20,7 @@ def configure(env, env_mono):
     # is_ios = env["platform"] == "ios"
     # is_ios_sim = is_ios and env["arch"] in ["x86_32", "x86_64"]
 
-    tools_enabled = env["tools"]
-
-    if tools_enabled and not module_supports_tools_on(env["platform"]):
-        raise RuntimeError("This module does not currently support building for this platform with tools enabled")
-
-    if env["tools"]:
+    if env.editor_build:
+        if not module_supports_tools_on(env["platform"]):
+            raise RuntimeError("This module does not currently support building for this platform for editor builds.")
         env_mono.Append(CPPDEFINES=["GD_MONO_HOT_RELOAD"])
diff --git a/modules/mono/config.py b/modules/mono/config.py
index 15fe79ef8c..a36083b64b 100644
--- a/modules/mono/config.py
+++ b/modules/mono/config.py
@@ -7,7 +7,7 @@ def can_build(env, platform):
     if env["arch"].startswith("rv"):
         return False
 
-    if env["tools"]:
+    if env.editor_build:
         env.module_add_dependencies("mono", ["regex"])
 
     return True