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Single Compilation Unit build.

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Adds support for simple SCU build (DEV_ENABLED only).
This speeds up compilation by compiling multiple cpp files within a single translation unit.
This commit is contained in:
lawnjelly
2023-05-17 16:22:26 +01:00
parent 543750a1b3
commit b69c8b4791
29 changed files with 531 additions and 137 deletions
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12
SConstruct
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@@ -55,6 +55,7 @@ _helper_module("modules.modules_builders", "modules/modules_builders.py")
import methods
import glsl_builders
import gles3_builders
import scu_builders
from platform_methods import architectures, architecture_aliases
if ARGUMENTS.get("target", "editor") == "editor":
@@ -223,6 +224,7 @@ opts.Add(
"",
)
opts.Add(BoolVariable("use_precise_math_checks", "Math checks use very precise epsilon (debug option)", False))
opts.Add(EnumVariable("scu_build", "Use single compilation unit build", "none", ("none", "dev", "all")))
# Thirdparty libraries
opts.Add(BoolVariable("builtin_certs", "Use the built-in SSL certificates bundles", True))
@@ -428,14 +430,20 @@ if env_base.debug_features:
# to give *users* extra debugging information for their game development.
env_base.Append(CPPDEFINES=["DEBUG_ENABLED"])
if env_base.dev_build:
# DEV_ENABLED enables *engine developer* code which should only be compiled for those
# working on the engine itself.
env_base.Append(CPPDEFINES=["DEV_ENABLED"])
env_base["use_scu"] = env_base["scu_build"] in ("dev", "all")
else:
# Disable assert() for production targets (only used in thirdparty code).
env_base.Append(CPPDEFINES=["NDEBUG"])
# SCU builds currently use a lot of compiler memory
# in release builds, so disallow outside of DEV builds unless "all" is set.
env_base["use_scu"] = env_base["scu_build"] == "all"
# SCons speed optimization controlled by the `fast_unsafe` option, which provide
# more than 10 s speed up for incremental rebuilds.
# Unsafe as they reduce the certainty of rebuilding all changed files, so it's
@@ -550,6 +558,10 @@ if selected_platform in platform_list:
# LTO "auto" means we handle the preferred option in each platform detect.py.
env["lto"] = ARGUMENTS.get("lto", "auto")
# Run SCU file generation script if in a SCU build.
if env["use_scu"]:
methods.set_scu_folders(scu_builders.generate_scu_files(env["verbose"], env_base.dev_build == False))
# Must happen after the flags' definition, as configure is when most flags
# are actually handled to change compile options, etc.
detect.configure(env)