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import os
import subprocess
def _parse_cflags(cflags: str):
info = {
"march": None,
"mabi": None,
"rv_bits": None, # 32 or 64
"has_f": False,
"has_d": False,
}
if not cflags:
return info
parts = cflags.split()
for flag in parts:
if flag.startswith("-march="):
info["march"] = flag.split("=", 1)[1]
if "rv32" in info["march"]:
info["rv_bits"] = 32
elif "rv64" in info["march"]:
info["rv_bits"] = 64
# crude feature detection
m = info["march"]
if m:
info["has_f"] = ("f" in m)
info["has_d"] = ("d" in m)
elif flag.startswith("-mabi="):
info["mabi"] = flag.split("=", 1)[1]
if info["mabi"] in ("ilp32d", "ilp32f", "lp64d", "lp64f"):
# floating-point ABI implies FPU availability
info["has_f"] = True
info["has_d"] = info["mabi"].endswith("d")
return info
def detect_rust_target(has, rtconfig):
"""
Decide the Rust target triple based on RT-Thread Kconfig and rtconfig.*.
`has` is a callable: has("SYMBOL") -> bool
"""
# ARM Cortex-M
if has("ARCH_ARM"):
# FPU hints from flags/macros
cflags = getattr(rtconfig, "CFLAGS", "")
hard_float = "-mfloat-abi=hard" in cflags or has("ARCH_ARM_FPU") or has("ARCH_FPU_VFP")
if has("ARCH_ARM_CORTEX_M3"):
return "thumbv7m-none-eabi"
if has("ARCH_ARM_CORTEX_M4") or has("ARCH_ARM_CORTEX_M7"):
return "thumbv7em-none-eabihf" if hard_float else "thumbv7em-none-eabi"
if has("ARCH_ARM_CORTEX_M33"):
# v8m.main
return "thumbv8m.main-none-eabi"
if has("ARCH_ARM_CORTEX_A"):
return "armv7a-none-eabi"
# AArch64
if has("ARCH_AARCH64") or has("ARCH_ARMV8") or has("ARCH_ARM64"):
if has("ARCH_CPU_FLOAT_ABI_SOFT"):
return "aarch64-unknown-none-softfloat"
return "aarch64-unknown-none"
# RISC-V
if has("ARCH_RISCV32") or has("ARCH_RISCV64"):
cflags = getattr(rtconfig, "CFLAGS", "")
info = _parse_cflags(cflags)
# fallback to Kconfig hint if march not present
rv_bits = info["rv_bits"] or (32 if has("ARCH_RISCV32") else 64)
# ABI must carry f/d to actually use hard-float calling convention
abi = info["mabi"] or ""
abi_has_fp = abi.endswith("f") or abi.endswith("d")
if rv_bits == 32:
# Only pick *f* target when ABI uses hard-float; otherwise use soft-float even if core has F/D
return "riscv32imafc-unknown-none-elf" if abi_has_fp else "riscv32imac-unknown-none-elf"
else:
# rv64: prefer gc (includes fd) only when ABI uses hard-float
return "riscv64gc-unknown-none-elf" if abi_has_fp else "riscv64imac-unknown-none-elf"
# Fallback by ARCH string or CFLAGS
arch = getattr(rtconfig, "ARCH", None)
if arch:
arch_l = arch.lower()
if "aarch64" in arch_l:
return "aarch64-unknown-none"
if "arm" == arch_l or "armv7" in arch_l:
return "armv7a-none-eabi"
if "riscv32" in arch_l:
return "riscv32imac-unknown-none-elf"
if "riscv64" in arch_l or "risc-v" in arch_l:
# Many BSPs use "risc-v" token; assume 64-bit for virt64
return "riscv64imac-unknown-none-elf"
# Parse CFLAGS for hints
cflags = getattr(rtconfig, "CFLAGS", "")
if "-mcpu=cortex-m3" in cflags:
return "thumbv7m-none-eabi"
if "-mcpu=cortex-m4" in cflags or "-mcpu=cortex-m7" in cflags:
if "-mfpu=" in cflags and "-mfloat-abi=hard" in cflags:
return "thumbv7em-none-eabihf"
return "thumbv7em-none-eabi"
if "-march=rv32" in cflags:
march_val = None
mabi_val = None
for flag in cflags.split():
if flag.startswith("-march="):
march_val = flag[len("-march="):]
elif flag.startswith("-mabi="):
mabi_val = flag[len("-mabi="):]
has_f_or_d = False
if march_val and any(x in march_val for x in ("f", "d")):
has_f_or_d = True
if mabi_val and any(x in mabi_val for x in ("f", "d")):
has_f_or_d = True
return "riscv32imafc-unknown-none-elf" if has_f_or_d else "riscv32imac-unknown-none-elf"
if "-march=rv64" in cflags:
march_val = None
mabi_val = None
for flag in cflags.split():
if flag.startswith("-march="):
march_val = flag[len("-march="):]
elif flag.startswith("-mabi="):
mabi_val = flag[len("-mabi="):]
has_f_or_d = False
if mabi_val and (("lp64d" in mabi_val) or ("lp64f" in mabi_val)):
has_f_or_d = True
if march_val and any(x in march_val for x in ("f", "d")):
has_f_or_d = True
if mabi_val and any(x in mabi_val for x in ("f", "d")):
has_f_or_d = True
if has_f_or_d:
return "riscv64gc-unknown-none-elf"
return "riscv64imac-unknown-none-elf"
return None
def make_rustflags(rtconfig, target: str):
rustflags = [
"-C", "opt-level=z",
"-C", "panic=abort",
"-C", "relocation-model=static",
]
if "riscv" in target:
rustflags += [
"-C", "code-model=medium",
"-C", "link-dead-code",
]
# propagate march/mabi for consistency (use link-arg for staticlib builds – harmless)
cflags = getattr(rtconfig, "CFLAGS", "")
for flag in cflags.split():
if flag.startswith("-march=") or flag.startswith("-mabi="):
rustflags += ["-C", f"link-arg={flag}"]
if "thumb" in target or "aarch64" in target:
rustflags += ["-C", "link-arg=-nostartfiles"]
return " ".join(rustflags)
def collect_features(has):
feats = []
if has("RT_USING_SMP"):
feats.append("smp")
return feats
def verify_rust_toolchain():
try:
r1 = subprocess.run(["rustc", "--version"], capture_output=True, text=True)
r2 = subprocess.run(["cargo", "--version"], capture_output=True, text=True)
return r1.returncode == 0 and r2.returncode == 0
except Exception:
return False
def ensure_rust_target_installed(target: str):
try:
result = subprocess.run(["rustup", "target", "list", "--installed"], capture_output=True, text=True)
if result.returncode == 0 and target in result.stdout:
return True
print(f"Rust target '{target}' is not installed.")
print(f"Please install it with: rustup target add {target}")
except Exception:
print("Warning: Failed to check rustup target list (rustup missing?)")
return False
def cargo_build_staticlib(rust_dir: str, target: str, features, debug: bool, rustflags: str = None):
build_root = os.path.join((os.path.abspath(os.path.join(rust_dir, os.pardir, os.pardir))), "build", "rust")
target_dir = os.path.join(build_root, "target")
os.makedirs(build_root, exist_ok=True)
env = os.environ.copy()
if rustflags:
prev = env.get("RUSTFLAGS", "").strip()
env["RUSTFLAGS"] = (prev + " " + rustflags).strip() if prev else rustflags
env["CARGO_TARGET_DIR"] = target_dir
cmd = ["cargo", "build", "--target", target, "--manifest-path", os.path.join(rust_dir, "Cargo.toml")]
if not debug:
cmd.insert(2, "--release")
if features:
cmd += ["--no-default-features", "--features", ",".join(features)]
print("Building Rust component (cargo)…")
res = subprocess.run(cmd, cwd=rust_dir, env=env, capture_output=True, text=True)
if res.returncode != 0:
print("Warning: Rust build failed")
if res.stderr:
print(res.stderr)
return None
mode = "debug" if debug else "release"
lib_path = os.path.join(target_dir, target, mode, "librt_rust.a")
if os.path.exists(lib_path):
print("Rust component built successfully")
return lib_path
print("Warning: Library not found at expected location")
return None
def clean_rust_build(bsp_root: str, artifact_type: str = "rust"):
"""Return the build directory path for SCons Clean operation"""
build_dir = os.path.join(bsp_root, "build", artifact_type)
return build_dir
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