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SCons: Refactor LTO options with lto=<none|thin|full>

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Adds support for LTO on macOS and Android. We don't have much experience
with LTO on these platforms so for now we keep it disabled by default
even when `production=yes` is set.

Similarly for iOS where we ship object files for the user to link in
Xcode so LTO makes builds extremely slow to link.

`production=yes` defaults to full LTO.
ThinLTO is much faster for LLVM-based compilers but seems to produce
bigger binaries (at least for the Web platform).
This commit is contained in:
Rémi Verschelde
2022-07-21 15:15:54 +02:00
parent 69233093d7
commit c2c659db32
7 changed files with 94 additions and 60 deletions
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62
SConstruct
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@@ -170,7 +170,7 @@ opts.Add(EnumVariable("arch", "CPU architecture", "auto", ["auto"] + architectur
opts.Add(EnumVariable("float", "Floating-point precision", "32", ("32", "64")))
opts.Add(EnumVariable("optimize", "Optimization type", "speed", ("speed", "size", "none")))
opts.Add(BoolVariable("production", "Set defaults to build Godot for use in production", False))
opts.Add(BoolVariable("use_lto", "Use link-time optimization", False))
opts.Add(EnumVariable("lto", "Link-time optimization (for production buids)", "none", ("none", "thin", "full")))
# Components
opts.Add(BoolVariable("deprecated", "Enable compatibility code for deprecated and removed features", True))
@@ -438,35 +438,6 @@ if selected_platform in platform_list:
)
env.SetOption("num_jobs", safer_cpu_count)
# 'dev' and 'production' are aliases to set default options if they haven't been set
# manually by the user.
if env["dev"]:
env["verbose"] = methods.get_cmdline_bool("verbose", True)
env["warnings"] = ARGUMENTS.get("warnings", "extra")
env["werror"] = methods.get_cmdline_bool("werror", True)
if env["tools"]:
env["tests"] = methods.get_cmdline_bool("tests", True)
if env["production"]:
env["use_static_cpp"] = methods.get_cmdline_bool("use_static_cpp", True)
env["use_lto"] = methods.get_cmdline_bool("use_lto", True)
env["debug_symbols"] = methods.get_cmdline_bool("debug_symbols", False)
if not env["tools"] and env["target"] == "debug":
print(
"WARNING: Requested `production` build with `tools=no target=debug`, "
"this will give you a full debug template (use `target=release_debug` "
"for an optimized template with debug features)."
)
if env.msvc:
print(
"WARNING: For `production` Windows builds, you should use MinGW with GCC "
"or Clang instead of Visual Studio, as they can better optimize the "
"GDScript VM in a very significant way. MSVC LTO also doesn't work "
"reliably for our use case."
"If you want to use MSVC nevertheless for production builds, set "
"`debug_symbols=no use_lto=no` instead of the `production=yes` option."
)
Exit(255)
env.extra_suffix = ""
if env["extra_suffix"] != "":
@@ -517,6 +488,37 @@ if selected_platform in platform_list:
# We apply it to CCFLAGS (both C and C++ code) in case it impacts C features.
env.Prepend(CCFLAGS=["/std:c++17"])
# 'dev' and 'production' are aliases to set default options if they haven't been set
# manually by the user.
if env["dev"]:
env["verbose"] = methods.get_cmdline_bool("verbose", True)
env["warnings"] = ARGUMENTS.get("warnings", "extra")
env["werror"] = methods.get_cmdline_bool("werror", True)
if env["tools"]:
env["tests"] = methods.get_cmdline_bool("tests", True)
if env["production"]:
env["use_static_cpp"] = methods.get_cmdline_bool("use_static_cpp", True)
env["lto"] = ARGUMENTS.get("lto", "full")
env["debug_symbols"] = methods.get_cmdline_bool("debug_symbols", False)
if not env["tools"] and env["target"] == "debug":
print(
"WARNING: Requested `production` build with `tools=no target=debug`, "
"this will give you a full debug template (use `target=release_debug` "
"for an optimized template with debug features)."
)
if env.msvc:
print(
"WARNING: For `production` Windows builds, you should use MinGW with GCC "
"or Clang instead of Visual Studio, as they can better optimize the "
"GDScript VM in a very significant way. MSVC LTO also doesn't work "
"reliably for our use case."
"If you want to use MSVC nevertheless for production builds, set "
"`debug_symbols=no lto=none` instead of the `production=yes` option."
)
Exit(255)
if env["lto"] != "none":
print("Using LTO: " + env["lto"])
# Enforce our minimal compiler version requirements
cc_version = methods.get_compiler_version(env) or {
"major": None,