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|
extern crate cmake;
extern crate convert_case;
use convert_case::{Case, Casing, StateConverter};
use std::{
env, io,
path::PathBuf,
process::{Command, Stdio},
};
use cmake::Config;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
let llvm_components = ["core", "analysis", "bit_reader", "bit_writer", "i_r_reader"]
.iter()
.map(|comp| comp.from_case(Case::Snake));
let msvc = is_msvc();
let (llvm_dir, additonal_cmake_file) = get_llvm_dir();
let (cmake_profile, out_dir) =
build_cmake_targets(llvm_components.clone(), llvm_dir, additonal_cmake_file);
emit_compile_and_linking_information(llvm_components, cmake_profile, out_dir, msvc)
}
fn is_msvc() -> bool {
env::var("CARGO_CFG_TARGET_ENV").unwrap() == "msvc"
}
fn get_llvm_dir() -> (PathBuf, PathBuf) {
let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
let mut additional_cmake_file = manifest_dir.clone();
additional_cmake_file.push("build.cmake");
let mut llvm_dir = manifest_dir.parent().unwrap().to_path_buf();
llvm_dir.push("llvm-project");
llvm_dir.push("llvm");
println!("cargo:rerun-if-changed={}", llvm_dir.display());
println!("cargo:rerun-if-changed={}", additional_cmake_file.display());
(llvm_dir, additional_cmake_file)
}
fn build_cmake_targets<'a>(
components: impl Iterator<Item = StateConverter<'a, &'static str>>,
llvm_dir: PathBuf,
additional_cmake_file: PathBuf,
) -> (String, PathBuf) {
let mut cmake = Config::new(llvm_dir);
use_ninja(&mut cmake);
cmake
.always_configure(true)
// Should be detected automatically, but we have reports of
// LLVM fiding ZLIB on Windows and then failing to link it.
// Out of caution we explicitly disable all autodetectable components
.define("LLVM_ENABLE_LIBXML2", "OFF")
.define("LLVM_ENABLE_ZLIB", "OFF")
.define("LLVM_ENABLE_ZSTD", "OFF")
.define("LLVM_ENABLE_CURL", "OFF")
.define("LLVM_ENABLE_HTTPLIB", "OFF")
.define("LLVM_ENABLE_LIBEDIT", "OFF")
.define("LLVM_ENABLE_TERMINFO", "OFF")
.define("LLVM_BUILD_TOOLS", "OFF")
.define("LLVM_TARGETS_TO_BUILD", "")
.define("LLVM_ENABLE_PROJECTS", "")
.define("CMAKE_PROJECT_INCLUDE_BEFORE", additional_cmake_file);
// Unfortunately CMake crate does not support building mutliple targets at once
for component in components {
cmake
.build_target(&format!("LLVM{}", component.to_case(Case::Pascal)))
.build();
}
(
cmake.get_profile().to_string(),
cmake.build_target("llvm-config").build(),
)
}
fn use_ninja(cmake: &mut Config) {
if let Ok(exit_status) = Command::new("ninja")
.stdin(Stdio::null())
.stdout(Stdio::null())
.stderr(Stdio::null())
.arg("--version")
.status()
{
if !exit_status.success() {
return;
}
cmake.generator("Ninja");
}
}
fn emit_compile_and_linking_information<'a>(
llvm_components: impl Iterator<Item = StateConverter<'a, &'static str>> + Clone,
cmake_profile: String,
out_dir: PathBuf,
is_msvc: bool,
) {
// MSBuild uses didfferent output path from ninja or Makefile.
// Not sure how to query CMake about it, so we just try once with
// ninja/Makefile path and then once with MSBuild path
let llvm_config_output = execute_llvm_config(
&out_dir,
&["build", "bin", "llvm-config"],
llvm_components.clone(),
)
.or_else(|_| {
execute_llvm_config(
&out_dir,
&["build", &*cmake_profile, "bin", "llvm-config"],
llvm_components,
)
})
.unwrap();
if !llvm_config_output.status.success() {
panic!()
}
let output = String::from_utf8_lossy(&llvm_config_output.stdout);
let lines = (&output).lines().collect::<Vec<_>>();
let (cxxflags, ldflags, libdir, libnames, system_libs) = match &*lines {
[cxxflags, ldflags, libdir, libnames, system_libs, ..] => {
(cxxflags, ldflags, libdir, libnames, system_libs)
}
_ => panic!(),
};
println!("cargo:cxxflags={}", cxxflags);
println!("cargo:rustc-link-arg={}", ldflags);
println!("cargo:rustc-link-search={}", libdir);
for lib in libnames.split_ascii_whitespace() {
let lib = if is_msvc {
// For some reason rustc appends .lib twice on msvc
&lib[..lib.len() - 4]
} else {
// On Linux, we get "libLLVMIRReader.a", so we cut "lib" and ".a"
&lib[3..lib.len() - 2]
};
println!("cargo:rustc-link-lib=static={}", lib);
}
for lib in system_libs.split_ascii_whitespace() {
let lib = if is_msvc {
&lib[..lib.len() - 4]
} else {
// On Linux, we get it as "-lxml2", so we cut "-l" part
&lib[2..]
};
println!("cargo:rustc-link-lib={}", lib);
}
if !is_msvc {
println!("cargo:rustc-link-lib=stdc++");
}
}
fn execute_llvm_config<'a>(
out_dir: &PathBuf,
llvm_config_exe_relative: &[&str],
llvm_components: impl Iterator<Item = StateConverter<'a, &'static str>>,
) -> io::Result<std::process::Output> {
let mut llvm_config_path = out_dir.clone();
llvm_config_path.extend(llvm_config_exe_relative);
let mut llvm_config_cmd = Command::new(&llvm_config_path);
llvm_config_cmd.args([
"--cxxflags",
"--ldflags",
"--libdir",
"--libnames",
"--system-libs",
"--link-static",
]);
for component in llvm_components {
llvm_config_cmd.arg(&component.to_case(Case::Flat));
}
llvm_config_cmd
.stdin(Stdio::null())
.stderr(Stdio::null())
.output()
}
|
