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//! Build script for rustfs-mimalloc-sys.
//!
//! Compiles mimalloc V3 as a static library using the `cc` crate.
//! Handles platform-specific flags, feature gates, and linker requirements.
use std::env;
struct TargetCfg {
triple: String,
arch: String,
env: String,
os: String,
vendor: String,
}
impl TargetCfg {
fn from_env() -> Self {
Self {
triple: env::var("TARGET").unwrap_or_default(),
arch: env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default(),
env: env::var("CARGO_CFG_TARGET_ENV").unwrap_or_default(),
os: env::var("CARGO_CFG_TARGET_OS").unwrap_or_default(),
vendor: env::var("CARGO_CFG_TARGET_VENDOR").unwrap_or_default(),
}
}
fn is_apple(&self) -> bool {
self.vendor == "apple"
}
fn is_msvc(&self) -> bool {
self.env == "msvc"
}
fn is_musl(&self) -> bool {
self.env == "musl"
}
fn is_windows(&self) -> bool {
self.os == "windows"
}
fn supports_initial_exec_tls(&self) -> bool {
self.is_apple() || matches!(self.os.as_str(), "linux" | "freebsd")
}
fn needs_armv6_atomic(&self) -> bool {
self.arch == "arm"
&& (self.triple.starts_with("armv6") || self.triple.starts_with("arm-unknown"))
}
}
fn main() {
let target = TargetCfg::from_env();
let is_debug = env::var("PROFILE").as_deref() == Ok("debug");
// Tell Cargo to re-run if features change
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-env-changed=CARGO_FEATURE_SECURE");
println!("cargo:rerun-if-env-changed=CARGO_FEATURE_DEBUG");
println!("cargo:rerun-if-env-changed=CARGO_FEATURE_DEBUG_IN_DEBUG");
println!("cargo:rerun-if-env-changed=CARGO_FEATURE_OVERRIDE");
println!("cargo:rerun-if-env-changed=CARGO_FEATURE_LOCAL_DYNAMIC_TLS");
println!("cargo:rerun-if-env-changed=CARGO_FEATURE_WIN_DIRECT_TLS");
println!("cargo:rerun-if-env-changed=CARGO_FEATURE_NO_THP");
let mut build = cc::Build::new();
build.file("c_src/mimalloc/src/static.c");
build.include("c_src/mimalloc/include");
build.include("c_src/mimalloc/src");
// Optimization flags
if !is_debug {
build.opt_level(3);
build.define("NDEBUG", None);
build.define("MI_BUILD_RELEASE", None);
} else {
build.opt_level(0);
build.debug(true);
}
// Debug mode: either explicit feature or auto-enable in debug builds
if env::var_os("CARGO_FEATURE_DEBUG").is_some()
|| (env::var_os("CARGO_FEATURE_DEBUG_IN_DEBUG").is_some() && is_debug)
{
build.define("MI_DEBUG", "2");
} else {
build.define("MI_DEBUG", "0");
}
// Secure mode: encrypt heap allocations
if env::var_os("CARGO_FEATURE_SECURE").is_some() {
build.define("MI_SECURE", "4");
}
// TLS model: default is initial-exec for performance.
// Use `local_dynamic_tls` feature to switch to local-dynamic model,
// which fixes compatibility with projects like polars that have TLS issues.
// See: https://github.com/purpleprotocol/mimalloc_rust/issues/138
if env::var_os("CARGO_FEATURE_LOCAL_DYNAMIC_TLS").is_some() {
build.flag_if_supported("-ftls-model=local-dynamic");
} else if target.supports_initial_exec_tls() {
build.flag_if_supported("-ftls-model=initial-exec");
}
if target.is_windows() && env::var_os("CARGO_FEATURE_WIN_DIRECT_TLS").is_some() {
build.define("MI_WIN_DIRECT_TLS", "1");
}
// Disable THP on Linux/Android if requested
// See: https://github.com/purpleprotocol/mimalloc_rust/pull/112
if env::var_os("CARGO_FEATURE_NO_THP").is_some() {
build.define("MI_NO_THP", "1");
}
// macOS: enable dyld interposing for proper override support
// See: https://github.com/purpleprotocol/mimalloc_rust/pull/145
if target.is_apple() && env::var_os("CARGO_FEATURE_OVERRIDE").is_some() {
build.define("MI_OSX_ZONE", "1");
build.define("MI_OSX_INTERPOSE", "1");
}
// Platform-specific compiler flags
if target.is_msvc() {
// MSVC: use correct runtime library based on debug/release
// See: https://github.com/purpleprotocol/mimalloc_rust/pull/167
if is_debug {
build.flag("/MDd");
} else {
build.flag("/MD");
}
// Suppress common MSVC warnings
build.flag("/wd4100"); // unreferenced formal parameter
build.flag("/wd4127"); // conditional expression is constant
build.flag("/wd4201"); // nameless struct/union
} else {
// Unix-like: standard warning suppression
build.flag_if_supported("-Wno-unused-function");
build.flag_if_supported("-Wno-unused-parameter");
// Fix musl + release build failures with __DATE__ / __TIME__ macros
// See: https://github.com/purpleprotocol/mimalloc_rust/pull/139
if target.is_musl() {
build.flag_if_supported("-Wno-error=date-time");
}
}
// ARM-specific: do NOT force ARMv8.1-A (fixes Raspberry Pi 4 compatibility)
// See: https://github.com/purpleprotocol/mimalloc_rust/issues/165
// We let the compiler use the target's default architecture level.
// If the user wants ARMv8.1-A optimizations, they can set RUSTFLAGS.
build.compile("mimalloc");
// Link required system libraries
link_system_libs(&target);
// Export include directory for downstream crates
let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
println!("cargo:include={manifest_dir}/c_src/mimalloc/include");
// Print version info
println!("cargo:version=30501"); // MI_MALLOC_VERSION from mimalloc.h
}
/// Link required system libraries based on the target platform.
fn link_system_libs(target: &TargetCfg) {
if target.is_windows() {
// Windows: required for crypto (BCryptGenRandom), process info (psapi),
// and token manipulation (advapi32 for large pages)
// See: https://github.com/purpleprotocol/mimalloc_rust/issues/135
println!("cargo:rustc-link-lib=advapi32");
println!("cargo:rustc-link-lib=bcrypt");
println!("cargo:rustc-link-lib=psapi");
println!("cargo:rustc-link-lib=shell32");
println!("cargo:rustc-link-lib=user32");
}
// ARMv6: needs libatomic for 64-bit atomic operations
// See: https://github.com/purpleprotocol/mimalloc_rust/pull/115
if target.needs_armv6_atomic() {
println!("cargo:rustc-link-lib=atomic");
}
}