Use clang for inspecting macros instead of compiling the binary. (#11)
This commit is contained in:
Nebojsa Sabovic
GitHub
parent
b65d0de4b0
commit
8eb9fa688f
@ -190,6 +190,16 @@ version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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[[package]]
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name = "clang"
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version = "2.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "84c044c781163c001b913cd018fc95a628c50d0d2dfea8bca77dad71edb16e37"
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dependencies = [
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"clang-sys",
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"libc",
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]
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[[package]]
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name = "clang-sys"
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version = "1.7.0"
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@ -290,6 +300,7 @@ version = "2.0.0+ffmpeg-7.0"
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dependencies = [
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"bindgen",
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"cc",
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"clang",
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"libc",
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"pkg-config",
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"vcpkg",
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@ -32,6 +32,7 @@ libc = "0.2"
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cc = "1.0"
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pkg-config = "0.3"
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bindgen = { version = "0.69", default-features = false, features = ["runtime"] }
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clang = { version = "2.0.0", features = ["clang_3_9", "runtime"] }
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[target.'cfg(target_env = "msvc")'.build-dependencies]
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vcpkg = "0.2"
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@ -1,11 +1,13 @@
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extern crate bindgen;
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extern crate cc;
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extern crate clang;
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extern crate pkg_config;
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use std::collections::HashMap;
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use std::env;
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use std::fmt::Write as FmtWrite;
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use std::fs::{self, File};
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use std::io::{self, BufRead, BufReader, Write};
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use std::io::{self, BufRead, BufReader};
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use std::path::{Path, PathBuf};
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use std::process::Command;
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use std::str;
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@ -229,7 +231,6 @@ static AVFORMAT_FEATURES: &[AVFeature] = &[
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AVFeature::new("ALLOW_FLUSH"),
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AVFeature::new("AVSTREAM_SIDE_DATA"),
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AVFeature::new("GET_DUR_ESTIMATE_METHOD"),
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AVFeature::new("R_FRAME_RATE"),
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];
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static AVDEVICE_FEATURES: &[AVFeature] = &[
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@ -715,135 +716,86 @@ fn add_pkg_config_path() {
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fn add_pkg_config_path() {}
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fn check_features(include_paths: &[PathBuf]) {
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let mut includes_code = String::new();
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let mut main_code = String::new();
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let clang = clang::Clang::new().expect("Cannot find clang");
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let index = clang::Index::new(&clang, false, false);
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for lib in LIBRARIES.iter().filter(|lib| lib.enabled()) {
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let header = format!("lib{}/{}.h", lib.name, lib.name);
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for feature in lib.features {
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let var = format!("FF_API_{}", feature.name);
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let enabled_libraries = || LIBRARIES.iter().filter(|lib| lib.enabled());
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let include = format!("#include <{}>", header);
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if !includes_code.contains(&include) {
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includes_code.push_str(&include);
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includes_code.push('\n');
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let mut code = String::new();
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for lib in enabled_libraries() {
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let _ = writeln!(code, "#include <lib{}/{}.h>", lib.name, lib.name);
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}
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let _ = write!(
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includes_code,
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r#"
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#ifndef {var}_is_defined
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#ifndef {var}
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#define {var} 0
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#define {var}_is_defined 0
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#else
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#define {var}_is_defined 1
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#endif
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#endif
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"#,
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var = var
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let mut features_defined_enabled = enabled_libraries()
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.flat_map(|lib| lib.features)
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.map(|feature| {
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let feature_name = format!("FF_API_{}", feature.name);
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let _ = writeln!(code, "#ifdef {feature_name}");
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let _ = writeln!(
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code,
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" int {} = {feature_name};",
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feature_name.to_lowercase()
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);
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let _ = writeln!(code, "#endif");
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(feature_name.to_lowercase(), (false, false))
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})
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.collect::<HashMap<_, _>>();
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let _ = write!(
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main_code,
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r#"printf("[{var}]%d%d\n", {var}, {var}_is_defined);
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"#,
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var = var
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);
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}
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}
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let version_check_info = [("avcodec", 56, 62, 0, 108)];
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for &(lib, begin_version_major, end_version_major, begin_version_minor, end_version_minor) in
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version_check_info.iter()
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{
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for version_major in begin_version_major..end_version_major {
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for version_minor in begin_version_minor..end_version_minor {
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let _ = write!(
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main_code,
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r#"printf("[{lib}_version_greater_than_{version_major}_{version_minor}]%d\n", LIB{lib_uppercase}_VERSION_MAJOR > {version_major} || (LIB{lib_uppercase}_VERSION_MAJOR == {version_major} && LIB{lib_uppercase}_VERSION_MINOR > {version_minor}));
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"#,
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lib = lib,
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lib_uppercase = lib.to_uppercase(),
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version_major = version_major,
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version_minor = version_minor
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);
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let mut versions = enabled_libraries()
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.map(|lib| (lib.name, (0, 0)))
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.collect::<HashMap<_, _>>();
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let include_args = include_paths
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.iter()
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.map(|path| format!("-I{}", path.to_string_lossy()))
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.collect::<Vec<_>>();
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let tu = index
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.parser("check.c")
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.arguments(&include_args)
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.detailed_preprocessing_record(true)
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.unsaved(&[clang::Unsaved::new("check.c", &code)])
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.parse()
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.expect("Unable to parse generated file");
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tu.get_entity().visit_children(|entity, _parent| {
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if let Some(name) = entity.get_name() {
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if entity.get_kind() == clang::EntityKind::VarDecl && name.starts_with("ff_api") {
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if let Some(clang::EvaluationResult::SignedInteger(value)) = entity.evaluate() {
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if let Some(val) = features_defined_enabled.get_mut(&name) {
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*val = (true, value != 0);
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}
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}
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}
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}
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clang::EntityVisitResult::Continue
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});
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for def in clang::sonar::find_definitions(tu.get_entity().get_children()) {
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if let clang::sonar::DefinitionValue::Integer(_, value) = def.value {
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if let Some(name) = def.name.strip_prefix("LIB") {
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if let Some(name) = name.strip_suffix("_VERSION_MAJOR") {
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if let Some(ver) = versions.get_mut(name.to_lowercase().as_str()) {
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ver.0 = value;
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}
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} else if let Some(name) = name.strip_suffix("_VERSION_MINOR") {
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if let Some(ver) = versions.get_mut(name.to_lowercase().as_str()) {
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ver.1 = value;
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}
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}
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}
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let out_dir = output();
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write!(
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File::create(out_dir.join("check.c")).expect("Failed to create file"),
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r#"
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#include <stdio.h>
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{includes_code}
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int main()
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{{
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{main_code}
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return 0;
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}}
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"#,
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includes_code = includes_code,
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main_code = main_code
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)
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.expect("Write failed");
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let executable = out_dir.join(if cfg!(windows) { "check.exe" } else { "check" });
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let mut compiler = cc::Build::new()
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.target(&env::var("HOST").unwrap()) // don't cross-compile this
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.get_compiler()
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.to_command();
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for dir in include_paths {
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compiler.arg("-I");
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compiler.arg(dir.to_string_lossy().into_owned());
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}
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if !compiler
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.current_dir(&out_dir)
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.arg("-o")
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.arg(&executable)
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.arg("check.c")
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.status()
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.expect("Command failed")
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.success()
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{
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panic!("Compile failed");
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}
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let check_output = Command::new(out_dir.join(&executable))
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.current_dir(&out_dir)
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.output()
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.expect("Check failed");
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if !check_output.status.success() {
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panic!(
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"{} failed: {}\n{}",
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executable.display(),
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String::from_utf8_lossy(&check_output.stdout),
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String::from_utf8_lossy(&check_output.stderr)
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);
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}
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let stdout = str::from_utf8(&check_output.stdout).unwrap();
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println!("stdout of {}={}", executable.display(), stdout);
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for lib in LIBRARIES.iter().filter(|lib| lib.enabled()) {
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for feature in lib.features {
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let var = format!("FF_API_{}", feature.name);
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let var_str = format!("[{var}]");
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let pos = var_str.len()
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+ stdout
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.find(&var_str)
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.unwrap_or_else(|| panic!("Variable '{}' not found in stdout output", var_str));
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if &stdout[pos..pos + 1] == "1" {
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for (var, (var_defined, var_enabled)) in features_defined_enabled {
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if var_enabled {
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println!(r#"cargo:rustc-cfg=feature="{}""#, var.to_lowercase());
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println!(r#"cargo:{}=true"#, var.to_lowercase());
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}
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// Also find out if defined or not (useful for cases where only the definition of a macro
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// can be used as distinction)
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if &stdout[pos + 1..pos + 2] == "1" {
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if var_defined {
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println!(
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r#"cargo:rustc-cfg=feature="{}_is_defined""#,
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var.to_lowercase()
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@ -851,30 +803,24 @@ fn check_features(include_paths: &[PathBuf]) {
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println!(r#"cargo:{}_is_defined=true"#, var.to_lowercase());
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}
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}
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}
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let version_check_info = [("avcodec", 56, 62, 0, 108)];
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for &(lib, begin_version_major, end_version_major, begin_version_minor, end_version_minor) in
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version_check_info.iter()
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&version_check_info
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{
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let libversion = *versions
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.get(lib)
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.expect("Unable to find the version for lib{lib}");
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for version_major in begin_version_major..end_version_major {
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for version_minor in begin_version_minor..end_version_minor {
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let search_str = format!(
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"[{lib}_version_greater_than_{version_major}_{version_minor}]",
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version_major = version_major,
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version_minor = version_minor,
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lib = lib
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);
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let pos = stdout
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.find(&search_str)
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.expect("Variable not found in output")
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+ search_str.len();
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if &stdout[pos..pos + 1] == "1" {
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if libversion >= (version_major, version_minor) {
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println!(
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r#"cargo:rustc-cfg=feature="{}""#,
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&search_str[1..(search_str.len() - 1)]
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r#"cargo:rustc-cfg=feature="{lib}_version_greater_than_{version_major}_{version_minor}""#
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);
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println!(
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r#"cargo:{lib}_version_greater_than_{version_major}_{version_minor}=true"#
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);
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println!(r#"cargo:{}=true"#, &search_str[1..(search_str.len() - 1)]);
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}
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}
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}
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@ -897,19 +843,13 @@ fn check_features(include_paths: &[PathBuf]) {
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("ffmpeg_6_1", 60, 31),
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("ffmpeg_7_0", 61, 3),
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];
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for &(ffmpeg_version_flag, lavc_version_major, lavc_version_minor) in
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ffmpeg_lavc_versions.iter()
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{
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let search_str = format!(
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"[avcodec_version_greater_than_{lavc_version_major}_{lavc_version_minor}]",
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lavc_version_major = lavc_version_major,
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lavc_version_minor = lavc_version_minor - 1
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);
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let pos = stdout
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.find(&search_str)
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.expect("Variable not found in output")
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+ search_str.len();
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if &stdout[pos..pos + 1] == "1" {
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let lavc_version = *versions
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.get("avcodec")
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.expect("Unable to find the version for lib{lib}");
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for &(ffmpeg_version_flag, lavc_version_major, lavc_version_minor) in &ffmpeg_lavc_versions {
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if lavc_version >= (lavc_version_major, lavc_version_minor) {
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println!(r#"cargo:rustc-cfg=feature="{}""#, ffmpeg_version_flag);
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println!(r#"cargo:{}=true"#, ffmpeg_version_flag);
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}
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@ -998,10 +938,7 @@ fn main() {
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let _ = pkgconfig.probe(&lib.lib_name()).unwrap();
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}
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pkgconfig
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.probe("libavcodec")
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.unwrap()
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.include_paths
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pkgconfig.probe("libavcodec").unwrap().include_paths
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};
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if statik && cfg!(target_os = "macos") {
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