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build: simplify build script

This commit is contained in:
David Hewitt 2020-12-30 16:27:18 +00:00
parent 1d8c14a5ca
commit 6fdcfdebe1
1 changed files with 69 additions and 136 deletions
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193
build.rs
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@ -1,7 +1,7 @@
use std::{
collections::HashMap,
convert::AsRef,
env, fmt,
env,
fs::{self, DirEntry, File},
io::{self, BufRead, BufReader},
path::{Path, PathBuf},
@ -36,45 +36,26 @@ struct InterpreterConfig {
calcsize_pointer: Option<u32>,
}
#[derive(Debug, Clone)]
struct PythonVersion {
major: u8,
minor: u8,
implementation: PythonInterpreterKind,
}
#[derive(Debug, Clone, PartialEq)]
pub enum PythonInterpreterKind {
CPython,
PyPy,
}
#[derive(Debug, Clone)]
struct PythonVersion {
major: u8,
// minor == None means any minor version will do
minor: Option<u8>,
implementation: PythonInterpreterKind,
}
impl PartialEq for PythonVersion {
fn eq(&self, o: &PythonVersion) -> bool {
self.major == o.major && (self.minor.is_none() || self.minor == o.minor)
}
}
impl fmt::Display for PythonVersion {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.major.fmt(f)?;
f.write_str(".")?;
match self.minor {
Some(minor) => minor.fmt(f)?,
None => f.write_str("*")?,
};
Ok(())
}
}
impl FromStr for PythonInterpreterKind {
type Err = Box<dyn std::error::Error>;
fn from_str(s: &str) -> Result<Self> {
match s {
"CPython" => Ok(PythonInterpreterKind::CPython),
"PyPy" => Ok(PythonInterpreterKind::PyPy),
_ => Err(format!("Invalid interpreter: {}", s).into()),
_ => bail!("Invalid interpreter: {}", s),
}
}
}
@ -93,7 +74,7 @@ impl GetPrimitive for HashMap<String, String> {
{
"1" | "true" | "True" => Ok(true),
"0" | "false" | "False" => Ok(false),
_ => Err(format!("{} must be a bool (1/true/True or 0/false/False", key).into()),
_ => bail!("{} must be a bool (1/true/True or 0/false/False", key),
}
}
@ -232,11 +213,11 @@ fn parse_header_defines(header_path: impl AsRef<Path>) -> Result<HashMap<String,
fn fix_config_map(
mut config_map: HashMap<String, String>,
version_minor: Option<u8>,
version_minor: u8,
) -> HashMap<String, String> {
if let Some("1") = config_map.get("Py_DEBUG").as_ref().map(|s| s.as_str()) {
config_map.insert("Py_REF_DEBUG".to_owned(), "1".to_owned());
if version_minor.map_or(false, |minor| minor <= 7) {
if version_minor <= 7 {
// Py_DEBUG only implies Py_TRACE_REFS until Python 3.7
config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());
}
@ -393,7 +374,6 @@ fn load_cross_compile_from_sysconfigdata(
let sysconfig_path = find_sysconfigdata(&python_paths)?;
let config_map = parse_sysconfigdata(sysconfig_path)?;
let shared = config_map.get_bool("Py_ENABLE_SHARED")?;
let major = config_map.get_numeric("version_major")?;
let minor = config_map.get_numeric("version_minor")?;
let ld_version = match config_map.get("LDVERSION") {
@ -404,14 +384,14 @@ fn load_cross_compile_from_sysconfigdata(
let python_version = PythonVersion {
major,
minor: Some(minor),
minor,
implementation: PythonInterpreterKind::CPython,
};
let interpreter_config = InterpreterConfig {
version: python_version,
libdir: python_paths.lib_dir.to_str().map(String::from),
shared,
shared: config_map.get_bool("Py_ENABLE_SHARED")?,
ld_version,
base_prefix: "".to_string(),
executable: PathBuf::new(),
@ -433,17 +413,16 @@ fn load_cross_compile_from_headers(
let python_version = PythonVersion {
major,
minor: Some(minor),
minor,
implementation: PythonInterpreterKind::CPython,
};
let config_map = parse_header_defines(python_include_dir.join("pyconfig.h"))?;
let shared = config_map.get_bool("Py_ENABLE_SHARED")?;
let interpreter_config = InterpreterConfig {
version: python_version,
libdir: python_paths.lib_dir.to_str().map(String::from),
shared,
shared: config_map.get_bool("Py_ENABLE_SHARED")?,
ld_version: format!("{}.{}", major, minor),
base_prefix: "".to_string(),
executable: PathBuf::new(),
@ -581,86 +560,29 @@ fn run_python_script(interpreter: &Path, script: &str) -> Result<String> {
}
}
fn get_library_link_name(version: &PythonVersion, ld_version: &str) -> String {
if cfg!(target_os = "windows") {
// Mirrors the behavior in CPython's `PC/pyconfig.h`.
fn get_rustc_link_lib(config: &InterpreterConfig) -> String {
let link_name = if env::var("CARGO_CFG_TARGET_OS").unwrap().as_str() == "windows" {
// Link against python3.lib for the stable ABI on Windows.
// See https://www.python.org/dev/peps/pep-0384/#linkage
//
// This contains only the limited ABI symbols.
if env::var_os("CARGO_FEATURE_ABI3").is_some() {
return "python3".to_string();
format!("python3")
} else {
format!("python{}{}", config.version.major, config.version.minor)
}
} else {
match config.version.implementation {
PythonInterpreterKind::CPython => format!("python{}", config.ld_version),
PythonInterpreterKind::PyPy => format!("pypy{}-c", config.version.major),
}
let minor_or_empty_string = match version.minor {
Some(minor) => format!("{}", minor),
None => String::new(),
};
format!("python{}{}", version.major, minor_or_empty_string)
} else {
match version.implementation {
PythonInterpreterKind::CPython => format!("python{}", ld_version),
PythonInterpreterKind::PyPy => format!("pypy{}-c", version.major),
}
}
}
fn get_rustc_link_lib(config: &InterpreterConfig) -> Result<String> {
match env::var("CARGO_CFG_TARGET_OS").unwrap().as_str() {
"windows" => get_rustc_link_lib_windows(config),
"macos" => get_rustc_link_lib_macos(config),
_ => get_rustc_link_lib_unix(config),
}
}
fn get_rustc_link_lib_unix(config: &InterpreterConfig) -> Result<String> {
if config.shared {
Ok(format!(
"cargo:rustc-link-lib={}",
get_library_link_name(&config.version, &config.ld_version)
))
} else {
Ok(format!(
"cargo:rustc-link-lib=static={}",
get_library_link_name(&config.version, &config.ld_version)
))
}
}
fn get_macos_linkmodel(config: &InterpreterConfig) -> Result<String> {
// PyPy 3.6 ships with a shared library, but doesn't have Py_ENABLE_SHARED.
if config.version.implementation == PythonInterpreterKind::PyPy {
return Ok("shared".to_string());
}
let script = r#"
import sysconfig
if sysconfig.get_config_var("PYTHONFRAMEWORK"):
print("framework")
elif sysconfig.get_config_var("Py_ENABLE_SHARED"):
print("shared")
else:
print("static")
"#;
let out = run_python_script(&config.executable, script)?;
Ok(out.trim_end().to_owned())
}
fn get_rustc_link_lib_macos(config: &InterpreterConfig) -> Result<String> {
// os x can be linked to a framework or static or dynamic, and
// Py_ENABLE_SHARED is wrong; framework means shared library
let link_name = get_library_link_name(&config.version, &config.ld_version);
match get_macos_linkmodel(config)?.as_ref() {
"static" => Ok(format!("cargo:rustc-link-lib=static={}", link_name,)),
"shared" => Ok(format!("cargo:rustc-link-lib={}", link_name)),
"framework" => Ok(format!("cargo:rustc-link-lib={}", link_name,)),
other => bail!("unknown linkmodel {}", other),
}
}
fn get_rustc_link_lib_windows(config: &InterpreterConfig) -> Result<String> {
// Py_ENABLE_SHARED doesn't seem to be present on windows.
Ok(format!(
"cargo:rustc-link-lib=pythonXY:{}",
get_library_link_name(&config.version, &config.ld_version)
))
format!(
"cargo:rustc-link-lib={link_model}{link_name}",
link_model = if config.shared { "" } else { "static=" },
link_name = link_name
)
}
fn find_interpreter() -> Result<PathBuf> {
@ -731,20 +653,34 @@ if libdir is not None:
print("libdir", libdir)
print("ld_version", sysconfig.get_config_var('LDVERSION') or sysconfig.get_config_var('py_version_short'))
print("base_prefix", sys.base_prefix)
print("framework", bool(sysconfig.get_config_var('PYTHONFRAMEWORK')))
print("shared", PYPY or ANACONDA or bool(sysconfig.get_config_var('Py_ENABLE_SHARED')))
print("executable", sys.executable)
print("calcsize_pointer", struct.calcsize("P"))
"#;
let output = run_python_script(interpreter, script)?;
let map: HashMap<String, String> = parse_script_output(&output);
let shared = match (
env::var("CARGO_CFG_TARGET_OS").unwrap().as_str(),
map["framework"].as_str(),
map["shared"].as_str(),
) {
(_, _, "True") // Py_ENABLE_SHARED is set
| ("windows", _, _) // Windows always uses shared linking
| ("macos", "True", _) // MacOS framework package uses shared linking
=> true,
(_, _, "False") => false, // Any other platform, Py_ENABLE_SHARED not set
_ => bail!("Unrecognised link model combination")
};
Ok(InterpreterConfig {
version: PythonVersion {
major: map["version_major"].parse()?,
minor: Some(map["version_minor"].parse()?),
minor: map["version_minor"].parse()?,
implementation: map["implementation"].parse()?,
},
libdir: map.get("libdir").cloned(),
shared: map["shared"] == "True",
shared,
ld_version: map["ld_version"].clone(),
base_prefix: map["base_prefix"].clone(),
executable: map["executable"].clone().into(),
@ -753,22 +689,20 @@ print("calcsize_pointer", struct.calcsize("P"))
}
fn configure(interpreter_config: &InterpreterConfig) -> Result<String> {
if let Some(minor) = interpreter_config.version.minor {
if minor < PY3_MIN_MINOR {
if interpreter_config.version.minor < PY3_MIN_MINOR {
bail!(
"Python 3 required version is 3.{}, current version is 3.{}",
PY3_MIN_MINOR,
minor
interpreter_config.version.minor
);
}
}
check_target_architecture(interpreter_config)?;
let target_os = env::var_os("CARGO_CFG_TARGET_OS").unwrap();
let is_extension_module = env::var_os("CARGO_FEATURE_EXTENSION_MODULE").is_some();
if !is_extension_module || target_os == "windows" || target_os == "android" {
println!("{}", get_rustc_link_lib(&interpreter_config)?);
println!("{}", get_rustc_link_lib(&interpreter_config));
if let Some(libdir) = &interpreter_config.libdir {
println!("cargo:rustc-link-search=native={}", libdir);
} else if target_os == "windows" {
@ -796,25 +730,24 @@ fn configure(interpreter_config: &InterpreterConfig) -> Result<String> {
// Check any `abi3-py3*` feature is set. If not, use the interpreter version.
let abi3_minor = (PY3_MIN_MINOR..=ABI3_MAX_MINOR)
.find(|i| env::var_os(format!("CARGO_FEATURE_ABI3_PY3{}", i)).is_some());
match (abi3_minor, interpreter_config.version.minor) {
(Some(abi3_minor), Some(interpreter_minor)) if abi3_minor > interpreter_minor => bail!(
"You cannot set a mininimum Python version {} higher than the interpreter version {}",
abi3_minor,
interpreter_minor
match abi3_minor {
Some(minor) if minor > interpreter_config.version.minor => bail!(
"You cannot set a mininimum Python version 3.{} higher than the interpreter version 3.{}",
minor,
interpreter_config.version.minor
),
_ => abi3_minor.or(interpreter_config.version.minor),
Some(minor) => minor,
None => interpreter_config.version.minor
}
} else {
interpreter_config.version.minor
};
if let Some(minor) = minor {
for i in PY3_MIN_MINOR..=minor {
println!("cargo:rustc-cfg=Py_3_{}", i);
flags += format!("CFG_Py_3_{},", i).as_ref();
}
}
println!("cargo:rustc-cfg=Py_3");
Ok(flags)
}
@ -906,7 +839,7 @@ fn main() -> Result<()> {
}
// WITH_THREAD is always on for 3.7
if interpreter_config.version.major == 3 && interpreter_config.version.minor.unwrap_or(0) >= 7 {
if interpreter_config.version.major == 3 && interpreter_config.version.minor >= 7 {
config_map.insert("WITH_THREAD".to_owned(), "1".to_owned());
}