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do not call python interpreter when cross compiling

This commit is contained in:
Matt Pelland 2019-01-23 23:01:02 -05:00
parent 80a6318b43
commit 6e4c2b71e0
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GPG Key ID: A696205C3D16B22E
1 changed files with 124 additions and 24 deletions
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148
build.rs
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@ -3,8 +3,12 @@ extern crate version_check;
use regex::Regex;
use std::collections::HashMap;
use std::convert::AsRef;
use std::env;
use std::fmt;
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::path::Path;
use std::process::Command;
use std::process::Stdio;
use version_check::{is_min_date, is_min_version, supports_features};
@ -74,11 +78,99 @@ static SYSCONFIG_VALUES: [&'static str; 1] = [
"Py_UNICODE_SIZE", // note - not present on python 3.3+, which is always wide
];
/// Attempts to parse the header at the given path, returning a map of definitions to their values.
/// Each entry in the map directly corresponds to a `#define` in the given header.
fn parse_header_defines<P: AsRef<Path>>(
pyconfig_path: P,
) -> Result<HashMap<String, String>, String> {
let define_regex =
Regex::new(r"^\s*#define\s+(?P<ident>[a-zA-Z0-9_]+)\s+(?P<value>.+)\s*$").unwrap();
let header_file = File::open(pyconfig_path).map_err(|e| e.to_string())?;
let header_reader = BufReader::new(&header_file);
let definitions = header_reader
.lines()
.filter_map(|maybe_line| {
let line = if let Ok(l) = maybe_line {
l
} else {
return None;
};
let captures = if let Some(c) = define_regex.captures(&line) {
c
} else {
return None;
};
if captures.name("ident").is_some() && captures.name("value").is_some() {
Some((
captures.name("ident").unwrap().as_str().to_owned(),
captures.name("value").unwrap().as_str().to_owned(),
))
} else {
None
}
})
.collect();
Ok(definitions)
}
fn fix_config_map(mut config_map: HashMap<String, String>) -> 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());
config_map.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());
config_map.insert("COUNT_ALLOCS".to_owned(), "1".to_owned());
}
config_map
}
fn load_cross_compile_info() -> Result<(PythonVersion, HashMap<String, String>, Vec<String>), String>
{
let python_include_dir =
env::var("PYO3_XC_PYTHON_INCLUDE_DIR").expect("PYO3_XC_PYTHON_INCLUDE_DIR must be defined");
let python_include_dir = Path::new(&python_include_dir);
let patchlevel_defines = parse_header_defines(python_include_dir.join("patchlevel.h"))?;
let major = patchlevel_defines
.get("PY_MAJOR_VERSION")
.and_then(|major| major.parse::<u8>().ok())
.expect("PY_MAJOR_VERSION undefined");
let minor = patchlevel_defines
.get("PY_MINOR_VERSION")
.and_then(|minor| minor.parse::<u8>().ok())
.expect("PY_MINOR_VERSION undefined");
let python_version = PythonVersion {
major,
minor: Some(minor),
};
let config_map = parse_header_defines(python_include_dir.join("pyconfig.h"))?;
let config_lines = vec![
"".to_owned(), // compatibility, not used when cross compiling.
env::var("PYO3_XC_PYTHON_LIB_DIR").expect("PYO3_XC_PYTHON_LIB_DIR must be defined"),
config_map
.get("Py_ENABLE_SHARED")
.expect("Py_ENABLE_SHARED undefined")
.to_owned(),
format!("{}.{}", major, minor),
"".to_owned(), // compatibility, not used when cross compiling.
];
Ok((python_version, fix_config_map(config_map), config_lines))
}
/// Examine python's compile flags to pass to cfg by launching
/// the interpreter and printing variables of interest from
/// sysconfig.get_config_vars.
#[cfg(not(target_os = "windows"))]
fn get_config_vars(python_path: &String) -> Result<HashMap<String, String>, String> {
fn get_config_vars(python_path: &str) -> Result<HashMap<String, String>, String> {
// FIXME: We can do much better here using serde:
// import json, sysconfig; print(json.dumps({k:str(v) for k, v in sysconfig.get_config_vars().items()}))
@ -103,7 +195,7 @@ fn get_config_vars(python_path: &String) -> Result<HashMap<String, String>, Stri
));
}
let all_vars = SYSCONFIG_FLAGS.iter().chain(SYSCONFIG_VALUES.iter());
let mut all_vars = all_vars.zip(split_stdout.iter()).fold(
let all_vars = all_vars.zip(split_stdout.iter()).fold(
HashMap::new(),
|mut memo: HashMap<String, String>, (&k, &v)| {
if !(v.to_owned() == "None" && is_value(k)) {
@ -113,18 +205,11 @@ fn get_config_vars(python_path: &String) -> Result<HashMap<String, String>, Stri
},
);
let debug = Some(&"1".to_string()) == all_vars.get("Py_DEBUG");
if debug {
all_vars.insert("Py_REF_DEBUG".to_owned(), "1".to_owned());
all_vars.insert("Py_TRACE_REFS".to_owned(), "1".to_owned());
all_vars.insert("COUNT_ALLOCS".to_owned(), "1".to_owned());
}
Ok(all_vars)
Ok(fix_config_map(all_vars))
}
#[cfg(target_os = "windows")]
fn get_config_vars(_: &String) -> Result<HashMap<String, String>, String> {
fn get_config_vars(_: &str) -> Result<HashMap<String, String>, String> {
// sysconfig is missing all the flags on windows, so we can't actually
// query the interpreter directly for its build flags.
//
@ -267,7 +352,8 @@ fn get_rustc_link_lib(version: &PythonVersion, _: &str, _: bool) -> Result<Strin
/// 4. `python{major version}.{minor version}`
///
/// If none of the above works, an error is returned
fn find_interpreter_and_get_config() -> Result<(PythonVersion, String, Vec<String>), String> {
fn find_interpreter_and_get_config(
) -> Result<(PythonVersion, HashMap<String, String>, Vec<String>), String> {
let version = version_from_env();
if let Some(sys_executable) = env::var_os("PYTHON_SYS_EXECUTABLE") {
@ -284,7 +370,11 @@ fn find_interpreter_and_get_config() -> Result<(PythonVersion, String, Vec<Strin
interpreter_version
);
} else {
return Ok((interpreter_version, interpreter_path.to_owned(), lines));
return Ok((
interpreter_version,
fix_config_map(get_config_vars(interpreter_path)?),
lines,
));
}
};
@ -297,7 +387,11 @@ fn find_interpreter_and_get_config() -> Result<(PythonVersion, String, Vec<Strin
let interpreter_path = "python";
let (interpreter_version, lines) = get_config_from_interpreter(interpreter_path)?;
if expected_version == interpreter_version {
return Ok((interpreter_version, interpreter_path.to_owned(), lines));
return Ok((
interpreter_version,
fix_config_map(get_config_vars(interpreter_path)?),
lines,
));
}
let major_interpreter_path = &format!("python{}", expected_version.major);
@ -305,7 +399,7 @@ fn find_interpreter_and_get_config() -> Result<(PythonVersion, String, Vec<Strin
if expected_version == interpreter_version {
return Ok((
interpreter_version,
major_interpreter_path.to_owned(),
fix_config_map(get_config_vars(major_interpreter_path)?),
lines,
));
}
@ -316,7 +410,7 @@ fn find_interpreter_and_get_config() -> Result<(PythonVersion, String, Vec<Strin
if expected_version == interpreter_version {
return Ok((
interpreter_version,
minor_interpreter_path.to_owned(),
fix_config_map(get_config_vars(minor_interpreter_path)?),
lines,
));
}
@ -463,19 +557,25 @@ fn check_rustc_version() {
fn main() {
check_rustc_version();
// 1. Setup cfg variables so we can do conditional compilation in this
// library based on the python interpeter's compilation flags. This is
// necessary for e.g. matching the right unicode and threading interfaces.
//
// This locates the python interpreter based on the PATH, which should
// work smoothly with an activated virtualenv.
// 1. Setup cfg variables so we can do conditional compilation in this library based on the
// python interpeter's compilation flags. This is necessary for e.g. matching the right unicode
// and threading interfaces. First check if we're cross compiling, if so, we cannot run the
// target Python interpreter and have to parse pyconfig.h instead. If we're not cross
// compiling, locate the python interpreter based on the PATH, which should work smoothly with
// an activated virtualenv, and load from there.
//
// If you have troubles with your shell accepting '.' in a var name,
// try using 'env' (sorry but this isn't our fault - it just has to
// match the pkg-config package name, which is going to have a . in it).
let (interpreter_version, interpreter_path, lines) = find_interpreter_and_get_config().unwrap();
let cross_compiling = env::var("PYO3_XC").is_ok();
let (interpreter_version, mut config_map, lines) = if cross_compiling {
load_cross_compile_info()
} else {
find_interpreter_and_get_config()
}
.unwrap();
let flags = configure(&interpreter_version, lines).unwrap();
let mut config_map = get_config_vars(&interpreter_path).unwrap();
// WITH_THREAD is always on for 3.7
if interpreter_version.major == 3 && interpreter_version.minor.unwrap_or(0) >= 7 {