87 lines
3.0 KiB
Python
87 lines
3.0 KiB
Python
import os
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import subprocess
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import sys
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def using_clang(env):
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return "clang" in os.path.basename(env["CC"])
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def is_vanilla_clang(env):
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if not using_clang(env):
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return False
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try:
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version = subprocess.check_output([env.subst(env["CXX"]), "--version"]).strip().decode("utf-8")
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except (subprocess.CalledProcessError, OSError):
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print("Couldn't parse CXX environment variable to infer compiler version.")
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return False
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return not version.startswith("Apple")
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def exists(env):
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return True
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def generate(env):
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# Require C++17
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if env.get("is_msvc", False):
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env.Append(CXXFLAGS=["/std:c++17"])
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else:
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env.Append(CXXFLAGS=["-std=c++17"])
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# Disable exception handling. Godot doesn't use exceptions anywhere, and this
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# saves around 20% of binary size and very significant build time.
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if env["disable_exceptions"]:
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if env.get("is_msvc", False):
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env.Append(CPPDEFINES=[("_HAS_EXCEPTIONS", 0)])
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else:
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env.Append(CXXFLAGS=["-fno-exceptions"])
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elif env.get("is_msvc", False):
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env.Append(CXXFLAGS=["/EHsc"])
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# Set optimize and debug_symbols flags.
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# "custom" means do nothing and let users set their own optimization flags.
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if env.get("is_msvc", False):
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if env["debug_symbols"]:
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env.Append(CCFLAGS=["/Zi", "/FS"])
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env.Append(LINKFLAGS=["/DEBUG:FULL"])
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if env["optimize"] == "speed":
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env.Append(CCFLAGS=["/O2"])
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env.Append(LINKFLAGS=["/OPT:REF"])
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elif env["optimize"] == "speed_trace":
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env.Append(CCFLAGS=["/O2"])
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env.Append(LINKFLAGS=["/OPT:REF", "/OPT:NOICF"])
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elif env["optimize"] == "size":
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env.Append(CCFLAGS=["/O1"])
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env.Append(LINKFLAGS=["/OPT:REF"])
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elif env["optimize"] == "debug" or env["optimize"] == "none":
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env.Append(CCFLAGS=["/Od"])
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else:
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if env["debug_symbols"]:
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# Adding dwarf-4 explicitly makes stacktraces work with clang builds,
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# otherwise addr2line doesn't understand them.
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env.Append(CCFLAGS=["-gdwarf-4"])
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if env.dev_build:
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env.Append(CCFLAGS=["-g3"])
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else:
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env.Append(CCFLAGS=["-g2"])
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else:
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if using_clang(env) and not is_vanilla_clang(env):
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# Apple Clang, its linker doesn't like -s.
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env.Append(LINKFLAGS=["-Wl,-S", "-Wl,-x", "-Wl,-dead_strip"])
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else:
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env.Append(LINKFLAGS=["-s"])
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if env["optimize"] == "speed":
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env.Append(CCFLAGS=["-O3"])
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# `-O2` is friendlier to debuggers than `-O3`, leading to better crash backtraces.
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elif env["optimize"] == "speed_trace":
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env.Append(CCFLAGS=["-O2"])
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elif env["optimize"] == "size":
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env.Append(CCFLAGS=["-Os"])
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elif env["optimize"] == "debug":
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env.Append(CCFLAGS=["-Og"])
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elif env["optimize"] == "none":
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env.Append(CCFLAGS=["-O0"])
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