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.

1 files changed, 7 insertions, 10 deletions

diff --git a/.github/actions/godot-build/action.yml b/.github/actions/godot-build/action.yml
index 75f3d9ab37..377480b123 100644
--- a/.github/actions/godot-build/action.yml
+++ b/.github/actions/godot-build/action.yml
@@ -2,16 +2,13 @@ name: Build Godot
 description: Build Godot with the provided options.
 inputs:
   target:
-    description: The scons target (debug/release_debug/release).
-    default: "debug"
-  tools:
-    description: If tools are to be built.
-    default: false
+    description: Build target (editor, template_release, template_debug).
+    default: "editor"
   tests:
-    description: If tests are to be built.
+    description: Unit tests.
     default: false
   platform:
-    description: The Godot platform to build.
+    description: Target platform.
     required: false
   sconsflags:
     default: ""
@@ -33,7 +30,7 @@ runs:
           SCONS_CACHE: ${{ inputs.scons-cache }}
           SCONS_CACHE_LIMIT: ${{ inputs.scons-cache-limit }}
       run: |
-        echo "Building with flags:" ${{ env.SCONSFLAGS }}
-        if ! ${{ inputs.tools }}; then rm -rf editor; fi  # Ensure we don't include editor code.
-        scons p=${{ inputs.platform }} target=${{ inputs.target }} tools=${{ inputs.tools }} tests=${{ inputs.tests }} ${{ env.SCONSFLAGS }}
+        echo "Building with flags:" platform=${{ inputs.platform }} target=${{ inputs.target }} tests=${{ inputs.tests }} ${{ env.SCONSFLAGS }}
+        if [ "${{ inputs.target }}" != "editor" ]; then rm -rf editor; fi  # Ensure we don't include editor code.
+        scons platform=${{ inputs.platform }} target=${{ inputs.target }} tests=${{ inputs.tests }} ${{ env.SCONSFLAGS }}
         ls -l bin/