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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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16
platform/linuxbsd/detect.py
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@ -31,7 +31,6 @@ def get_opts():
return [
EnumVariable("linker", "Linker program", "default", ("default", "bfd", "gold", "lld", "mold")),
BoolVariable("use_llvm", "Use the LLVM compiler", False),
BoolVariable("use_thinlto", "Use ThinLTO (LLVM only, requires linker=lld, implies use_lto=yes)", False),
BoolVariable("use_static_cpp", "Link libgcc and libstdc++ statically for better portability", True),
BoolVariable("use_coverage", "Test Godot coverage", False),
BoolVariable("use_ubsan", "Use LLVM/GCC compiler undefined behavior sanitizer (UBSAN)", False),
@ -129,13 +128,6 @@ def configure(env):
else:
env.Append(LINKFLAGS=["-fuse-ld=%s" % env["linker"]])
if env["use_thinlto"]:
if not env["use_llvm"] or env["linker"] != "lld":
print("ThinLTO is only compatible with LLVM and the LLD linker, use `use_llvm=yes linker=lld`.")
sys.exit(255)
else:
env["use_lto"] = True # ThinLTO implies LTO
if env["use_coverage"]:
env.Append(CCFLAGS=["-ftest-coverage", "-fprofile-arcs"])
env.Append(LINKFLAGS=["-ftest-coverage", "-fprofile-arcs"])
@ -178,8 +170,12 @@ def configure(env):
env.Append(CCFLAGS=["-fsanitize-recover=memory"])
env.Append(LINKFLAGS=["-fsanitize=memory"])
if env["use_lto"]:
if env["use_thinlto"]:
# LTO
if env["lto"] != "none":
if env["lto"] == "thin":
if not env["use_llvm"]:
print("ThinLTO is only compatible with LLVM, use `use_llvm=yes` or `lto=full`.")
sys.exit(255)
env.Append(CCFLAGS=["-flto=thin"])
env.Append(LINKFLAGS=["-flto=thin"])
elif not env["use_llvm"] and env.GetOption("num_jobs") > 1: