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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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14
platform/web/detect.py
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@ -31,7 +31,6 @@ def get_opts():
return [
("initial_memory", "Initial WASM memory (in MiB)", 32),
BoolVariable("use_assertions", "Use Emscripten runtime assertions", False),
BoolVariable("use_thinlto", "Use ThinLTO", False),
BoolVariable("use_ubsan", "Use Emscripten undefined behavior sanitizer (UBSAN)", False),
BoolVariable("use_asan", "Use Emscripten address sanitizer (ASAN)", False),
BoolVariable("use_lsan", "Use Emscripten leak sanitizer (LSAN)", False),
@ -110,12 +109,13 @@ def configure(env):
env["ENV"] = os.environ
# LTO
if env["use_thinlto"]:
env.Append(CCFLAGS=["-flto=thin"])
env.Append(LINKFLAGS=["-flto=thin"])
elif env["use_lto"]:
env.Append(CCFLAGS=["-flto=full"])
env.Append(LINKFLAGS=["-flto=full"])
if env["lto"] != "none":
if env["lto"] == "thin":
env.Append(CCFLAGS=["-flto=thin"])
env.Append(LINKFLAGS=["-flto=thin"])
else:
env.Append(CCFLAGS=["-flto"])
env.Append(LINKFLAGS=["-flto"])
# Sanitizers
if env["use_ubsan"]: