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[SCons] Move the GodotCPP build to its own tool.
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@Faless
Faless committed Aug 29, 2023
1 parent 6d9416e commit f8b4f60
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Showing 2 changed files with 315 additions and 276 deletions.
282 changes: 6 additions & 276 deletions SConstruct
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Original file line number Diff line number Diff line change
Expand Up @@ -7,54 +7,9 @@ import subprocess
from binding_generator import scons_generate_bindings, scons_emit_files
from SCons.Errors import UserError

EnsureSConsVersion(4, 0)


def add_sources(sources, dir, extension):
for f in os.listdir(dir):
if f.endswith("." + extension):
sources.append(dir + "/" + f)


def normalize_path(val):
return val if os.path.isabs(val) else os.path.join(env.Dir("#").abspath, val)


def validate_file(key, val, env):
if not os.path.isfile(normalize_path(val)):
raise UserError("'%s' is not a file: %s" % (key, val))


def validate_dir(key, val, env):
if not os.path.isdir(normalize_path(val)):
raise UserError("'%s' is not a directory: %s" % (key, val))


def validate_parent_dir(key, val, env):
if not os.path.isdir(normalize_path(os.path.dirname(val))):
raise UserError("'%s' is not a directory: %s" % (key, os.path.dirname(val)))


def get_gdextension_dir(env):
return normalize_path(env.get("gdextension_dir", env.Dir("gdextension").abspath))


def get_api_file(env):
return normalize_path(env.get("custom_api_file", os.path.join(get_gdextension_dir(env), "extension_api.json")))

EnsureSConsVersion(4, 0)

# Try to detect the host platform automatically.
# This is used if no `platform` argument is passed
if sys.platform.startswith("linux"):
default_platform = "linux"
elif sys.platform == "darwin":
default_platform = "macos"
elif sys.platform == "win32" or sys.platform == "msys":
default_platform = "windows"
elif ARGUMENTS.get("platform", ""):
default_platform = ARGUMENTS.get("platform")
else:
raise ValueError("Could not detect platform automatically, please specify with platform=<platform>")

try:
Import("env")
Expand All @@ -65,24 +20,6 @@ except:

env.PrependENVPath("PATH", os.getenv("PATH"))

# Default num_jobs to local cpu count if not user specified.
# SCons has a peculiarity where user-specified options won't be overridden
# by SetOption, so we can rely on this to know if we should use our default.
initial_num_jobs = env.GetOption("num_jobs")
altered_num_jobs = initial_num_jobs + 1
env.SetOption("num_jobs", altered_num_jobs)
if env.GetOption("num_jobs") == altered_num_jobs:
cpu_count = os.cpu_count()
if cpu_count is None:
print("Couldn't auto-detect CPU count to configure build parallelism. Specify it with the -j argument.")
else:
safer_cpu_count = cpu_count if cpu_count <= 4 else cpu_count - 1
print(
"Auto-detected %d CPU cores available for build parallelism. Using %d cores by default. You can override it with the -j argument."
% (cpu_count, safer_cpu_count)
)
env.SetOption("num_jobs", safer_cpu_count)

# Custom options and profile flags.
customs = ["custom.py"]
profile = ARGUMENTS.get("profile", "")
Expand All @@ -92,159 +29,11 @@ if profile:
elif os.path.isfile(profile + ".py"):
customs.append(profile + ".py")
opts = Variables(customs, ARGUMENTS)

platforms = ("linux", "macos", "windows", "android", "ios", "javascript")
opts.Add(
EnumVariable(
key="platform",
help="Target platform",
default=env.get("platform", default_platform),
allowed_values=platforms,
ignorecase=2,
)
)

# Editor and template_debug are compatible (i.e. you can use the same binary for Godot editor builds and Godot debug templates).
# Godot release templates are only compatible with "template_release" builds.
# For this reason, we default to template_debug builds, unlike Godot which defaults to editor builds.
opts.Add(
EnumVariable(
key="target",
help="Compilation target",
default=env.get("target", "template_debug"),
allowed_values=("editor", "template_release", "template_debug"),
)
)
opts.Add(
PathVariable(
key="gdextension_dir",
help="Path to a custom directory containing GDExtension interface header and API JSON file",
default=env.get("gdextension_dir", None),
validator=validate_dir,
)
)
opts.Add(
PathVariable(
key="custom_api_file",
help="Path to a custom GDExtension API JSON file (takes precedence over `gdextension_dir`)",
default=env.get("custom_api_file", None),
validator=validate_file,
)
)
opts.Add(
BoolVariable(
key="generate_bindings",
help="Force GDExtension API bindings generation. Auto-detected by default.",
default=env.get("generate_bindings", False),
)
)
opts.Add(
BoolVariable(
key="generate_template_get_node",
help="Generate a template version of the Node class's get_node.",
default=env.get("generate_template_get_node", True),
)
)

opts.Add(BoolVariable(key="build_library", help="Build the godot-cpp library.", default=env.get("build_library", True)))
opts.Add(
EnumVariable(
key="precision",
help="Set the floating-point precision level",
default=env.get("precision", "single"),
allowed_values=("single", "double"),
)
)

# compiledb
opts.Add(
BoolVariable(
key="compiledb",
help="Generate compilation DB (`compile_commands.json`) for external tools",
default=env.get("compiledb", False),
)
)
opts.Add(
PathVariable(
key="compiledb_file",
help="Path to a custom `compile_commands.json` file",
default=env.get("compiledb_file", "compile_commands.json"),
validator=validate_parent_dir,
)
)

# Add platform options
tools = {}
for pl in platforms:
tool = Tool(pl, toolpath=["tools"])
if hasattr(tool, "options"):
tool.options(opts)
tools[pl] = tool

# CPU architecture options.
architecture_array = ["", "universal", "x86_32", "x86_64", "arm32", "arm64", "rv64", "ppc32", "ppc64", "wasm32"]
architecture_aliases = {
"x64": "x86_64",
"amd64": "x86_64",
"armv7": "arm32",
"armv8": "arm64",
"arm64v8": "arm64",
"aarch64": "arm64",
"rv": "rv64",
"riscv": "rv64",
"riscv64": "rv64",
"ppcle": "ppc32",
"ppc": "ppc32",
"ppc64le": "ppc64",
}
opts.Add(
EnumVariable(
key="arch",
help="CPU architecture",
default=env.get("arch", ""),
allowed_values=architecture_array,
map=architecture_aliases,
)
)

# Targets flags tool (optimizations, debug symbols)
target_tool = Tool("targets", toolpath=["tools"])
target_tool.options(opts)

cpp_tool = Tool("godotcpp", toolpath=["tools"])
cpp_tool.options(opts, env)
opts.Update(env)
Help(opts.GenerateHelpText(env))

# Process CPU architecture argument.
if env["arch"] == "":
# No architecture specified. Default to arm64 if building for Android,
# universal if building for macOS or iOS, wasm32 if building for web,
# otherwise default to the host architecture.
if env["platform"] in ["macos", "ios"]:
env["arch"] = "universal"
elif env["platform"] == "android":
env["arch"] = "arm64"
elif env["platform"] == "javascript":
env["arch"] = "wasm32"
else:
host_machine = platform.machine().lower()
if host_machine in architecture_array:
env["arch"] = host_machine
elif host_machine in architecture_aliases.keys():
env["arch"] = architecture_aliases[host_machine]
elif "86" in host_machine:
# Catches x86, i386, i486, i586, i686, etc.
env["arch"] = "x86_32"
else:
print("Unsupported CPU architecture: " + host_machine)
Exit()

tool = Tool(env["platform"], toolpath=["tools"])

if tool is None or not tool.exists(env):
raise ValueError("Required toolchain not found for platform " + env["platform"])

tool.generate(env)
target_tool.generate(env)
Help(opts.GenerateHelpText(env))

# Detect and print a warning listing unknown SCons variables to ease troubleshooting.
unknown = opts.UnknownVariables()
Expand All @@ -253,71 +42,12 @@ if unknown:
for item in unknown.items():
print(" " + item[0] + "=" + item[1])

print("Building for architecture " + env["arch"] + " on platform " + env["platform"])

# Require C++17
if env.get("is_msvc", False):
env.Append(CXXFLAGS=["/std:c++17"])
else:
env.Append(CXXFLAGS=["-std=c++17"])

if env["precision"] == "double":
env.Append(CPPDEFINES=["REAL_T_IS_DOUBLE"])

# compile_commands.json
if env.get("compiledb", False):
env.Tool("compilation_db")
env.Alias("compiledb", env.CompilationDatabase(normalize_path(env["compiledb_file"])))

# Generate bindings
env.Append(BUILDERS={"GenerateBindings": Builder(action=scons_generate_bindings, emitter=scons_emit_files)})

bindings = env.GenerateBindings(
env.Dir("."),
[get_api_file(env), os.path.join(get_gdextension_dir(env), "gdextension_interface.h"), "binding_generator.py"],
)

scons_cache_path = os.environ.get("SCONS_CACHE")
if scons_cache_path is not None:
CacheDir(scons_cache_path)
Decider("MD5")

# Forces bindings regeneration.
if env["generate_bindings"]:
AlwaysBuild(bindings)
NoCache(bindings)

# Includes
env.Append(CPPPATH=[[env.Dir(d) for d in [get_gdextension_dir(env), "include", os.path.join("gen", "include")]]])

# Sources to compile
sources = []
add_sources(sources, "src", "cpp")
add_sources(sources, "src/classes", "cpp")
add_sources(sources, "src/core", "cpp")
add_sources(sources, "src/variant", "cpp")
sources.extend([f for f in bindings if str(f).endswith(".cpp")])

suffix = ".{}.{}".format(env["platform"], env["target"])
if env.dev_build:
suffix += ".dev"
if env["precision"] == "double":
suffix += ".double"
suffix += "." + env["arch"]
if env["ios_simulator"]:
suffix += ".simulator"

# Expose it when included from another project
env["suffix"] = suffix

library = None
env["OBJSUFFIX"] = suffix + env["OBJSUFFIX"]
library_name = "libgodot-cpp{}{}".format(suffix, env["LIBSUFFIX"])

if env["build_library"]:
library = env.StaticLibrary(target=env.File("bin/%s" % library_name), source=sources)
Default(library)
cpp_tool.generate(env)
library = env.GodotCPP()

env.Append(LIBPATH=[env.Dir("bin")])
env.Append(LIBS=library_name)
Return("env")
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