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Add lto scons option, defaulting to "none".

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This commit is contained in:
Lukas Tenbrink
2024-09-21 12:52:50 +02:00
parent 57bd88ad99
commit 5f7cf05043
8 changed files with 69 additions and 0 deletions
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30
tools/common_compiler_flags.py
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@@ -22,6 +22,10 @@ def exists(env):
def generate(env):
assert env["lto"] in ["thin", "full", "none"], "Unrecognized lto: {}".format(env["lto"])
if env["lto"] != "none":
print("Using LTO: " + env["lto"])
# Require C++17
if env.get("is_msvc", False):
env.Append(CXXFLAGS=["/std:c++17"])
@@ -64,6 +68,22 @@ def generate(env):
env.Append(LINKFLAGS=["/OPT:REF"])
elif env["optimize"] == "debug" or env["optimize"] == "none":
env.Append(CCFLAGS=["/Od"])
if env["lto"] == "thin":
if not env["use_llvm"]:
print("ThinLTO is only compatible with LLVM, use `use_llvm=yes` or `lto=full`.")
env.Exit(255)
env.Append(CCFLAGS=["-flto=thin"])
env.Append(LINKFLAGS=["-flto=thin"])
elif env["lto"] == "full":
if env["use_llvm"]:
env.Append(CCFLAGS=["-flto"])
env.Append(LINKFLAGS=["-flto"])
else:
env.AppendUnique(CCFLAGS=["/GL"])
env.AppendUnique(ARFLAGS=["/LTCG"])
env.AppendUnique(LINKFLAGS=["/LTCG"])
else:
if env["debug_symbols"]:
# Adding dwarf-4 explicitly makes stacktraces work with clang builds,
@@ -91,3 +111,13 @@ def generate(env):
env.Append(CCFLAGS=["-Og"])
elif env["optimize"] == "none":
env.Append(CCFLAGS=["-O0"])
if env["lto"] == "thin":
if (env["platform"] == "windows" or env["platform"] == "linux") and not env["use_llvm"]:
print("ThinLTO is only compatible with LLVM, use `use_llvm=yes` or `lto=full`.")
env.Exit(255)
env.Append(CCFLAGS=["-flto=thin"])
env.Append(LINKFLAGS=["-flto=thin"])
elif env["lto"] == "full":
env.Append(CCFLAGS=["-flto"])
env.Append(LINKFLAGS=["-flto"])