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SCons: Add fast_unsafe option for faster rebuilds #57806

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merged 1 commit into from
Feb 9, 2022
Merged

SCons: Add fast_unsafe option for faster rebuilds #57806

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14 changes: 13 additions & 1 deletion SConstruct
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Original file line number Diff line number Diff line change
Expand Up @@ -179,9 +179,10 @@ opts.Add(BoolVariable("use_volk", "Use the volk library to load the Vulkan loade

# Advanced options
opts.Add(BoolVariable("dev", "If yes, alias for verbose=yes warnings=extra werror=yes", False))
opts.Add(BoolVariable("progress", "Show a progress indicator during compilation", True))
opts.Add(BoolVariable("tests", "Build the unit tests", False))
opts.Add(BoolVariable("fast_unsafe", "Enable unsafe options for faster rebuilds", False))
opts.Add(BoolVariable("verbose", "Enable verbose output for the compilation", False))
opts.Add(BoolVariable("progress", "Show a progress indicator during compilation", True))
opts.Add(EnumVariable("warnings", "Level of compilation warnings", "all", ("extra", "all", "moderate", "no")))
opts.Add(BoolVariable("werror", "Treat compiler warnings as errors", False))
opts.Add("extra_suffix", "Custom extra suffix added to the base filename of all generated binary files", "")
Expand Down Expand Up @@ -360,6 +361,17 @@ if env_base["target"] == "debug":
# working on the engine itself.
env_base.Append(CPPDEFINES=["DEV_ENABLED"])

# 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
# enabled by default for `debug` builds, and can be overridden from command line.
# Ref: https://github.com/SCons/scons/wiki/GoFastButton
if methods.get_cmdline_bool("fast_unsafe", env_base["target"] == "debug"):
# Renamed to `content-timestamp` in SCons >= 4.2, keeping MD5 for compat.
env_base.Decider("MD5-timestamp")
env_base.SetOption("implicit_cache", 1)
env_base.SetOption("max_drift", 60)

if env_base["use_precise_math_checks"]:
env_base.Append(CPPDEFINES=["PRECISE_MATH_CHECKS"])

Expand Down