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Switch to a target structure in build.rs
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‎build.rs‎

Lines changed: 77 additions & 39 deletions
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,50 @@
11
use std::{collections::BTreeMap, env, path::PathBuf, sync::atomic::Ordering};
22

3+
#[allow(dead_code)]
4+
struct Target {
5+
triple: String,
6+
os: String,
7+
arch: String,
8+
vendor: String,
9+
env: String,
10+
pointer_width: u8,
11+
little_endian: bool,
12+
features: Vec<String>,
13+
}
14+
15+
impl Target {
16+
fn from_env() -> Self {
17+
let little_endian = match env::var("CARGO_CFG_TARGET_LITTLE_ENDIAN").unwrap().as_str() {
18+
"little" => true,
19+
"big" => false,
20+
x => panic!("unknown endian {x}"),
21+
};
22+
23+
Self {
24+
triple: env::var("TARGET").unwrap(),
25+
os: env::var("CARGO_CFG_TARGET_OS").unwrap(),
26+
arch: env::var("CARGO_CFG_TARGET_ARCH").unwrap(),
27+
vendor: env::var("CARGO_CFG_TARGET_VENDOR").unwrap(),
28+
env: env::var("CARGO_CFG_TARGET_ENV").unwrap(),
29+
pointer_width: env::var("CARGO_CFG_TARGET_POINTER_WIDTH")
30+
.unwrap()
31+
.parse()
32+
.unwrap(),
33+
little_endian,
34+
features: env::var("CARGO_CFG_TARGET_FEATURES")
35+
.unwrap()
36+
.split(",")
37+
.map(ToOwned::to_owned)
38+
.collect(),
39+
}
40+
}
41+
}
42+
343
fn main() {
444
println!("cargo:rerun-if-changed=build.rs");
545
configure_check_cfg();
646

7-
let target = env::var("TARGET").unwrap();
47+
let target = Target::from_env();
848
let cwd = env::current_dir().unwrap();
949

1050
println!("cargo:compiler-rt={}", cwd.join("compiler-rt").display());
@@ -14,43 +54,43 @@ fn main() {
1454
println!("cargo:rustc-cfg=feature=\"unstable\"");
1555

1656
// Emscripten's runtime includes all the builtins
17-
if target.contains("emscripten") {
57+
if target.env == "emscripten" {
1858
return;
1959
}
2060

2161
// OpenBSD provides compiler_rt by default, use it instead of rebuilding it from source
22-
if target.contains("openbsd") {
62+
if target.os == "openbsd" {
2363
println!("cargo:rustc-link-search=native=/usr/lib");
2464
println!("cargo:rustc-link-lib=compiler_rt");
2565
return;
2666
}
2767

2868
// Forcibly enable memory intrinsics on wasm & SGX as we don't have a libc to
2969
// provide them.
30-
if (target.contains("wasm") && !target.contains("wasi"))
31-
|| (target.contains("sgx") && target.contains("fortanix"))
32-
|| target.contains("-none")
33-
|| target.contains("nvptx")
34-
|| target.contains("uefi")
35-
|| target.contains("xous")
70+
if (target.triple.contains("wasm") && !target.triple.contains("wasi"))
71+
|| (target.triple.contains("sgx") && target.triple.contains("fortanix"))
72+
|| target.triple.contains("-none")
73+
|| target.triple.contains("nvptx")
74+
|| target.triple.contains("uefi")
75+
|| target.triple.contains("xous")
3676
{
3777
println!("cargo:rustc-cfg=feature=\"mem\"");
3878
}
3979

4080
// These targets have hardware unaligned access support.
4181
println!("cargo::rustc-check-cfg=cfg(feature, values(\"mem-unaligned\"))");
42-
if target.contains("x86_64")
43-
|| target.contains("i686")
44-
|| target.contains("aarch64")
45-
|| target.contains("bpf")
82+
if target.arch.contains("x86_64")
83+
|| target.arch.contains("i686")
84+
|| target.arch.contains("aarch64")
85+
|| target.arch.contains("bpf")
4686
{
4787
println!("cargo:rustc-cfg=feature=\"mem-unaligned\"");
4888
}
4989

5090
// NOTE we are going to assume that llvm-target, what determines our codegen option, matches the
5191
// target triple. This is usually correct for our built-in targets but can break in presence of
5292
// custom targets, which can have arbitrary names.
53-
let llvm_target = target.split('-').collect::<Vec<_>>();
93+
let llvm_target = target.triple.split('-').collect::<Vec<_>>();
5494

5595
// Build missing intrinsics from compiler-rt C source code. If we're
5696
// mangling names though we assume that we're also in test mode so we don't
@@ -60,7 +100,7 @@ fn main() {
60100
// Don't use a C compiler for these targets:
61101
//
62102
// * nvptx - everything is bitcode, not compatible with mixed C/Rust
63-
if !target.contains("nvptx") {
103+
if !target.arch.contains("nvptx") {
64104
#[cfg(feature = "c")]
65105
c::compile(&llvm_target, &target);
66106
}
@@ -86,7 +126,7 @@ fn main() {
86126
println!("cargo::rustc-check-cfg=cfg(kernel_user_helpers)");
87127
if llvm_target[0] == "armv4t"
88128
|| llvm_target[0] == "armv5te"
89-
|| target == "arm-linux-androideabi"
129+
|| target.triple == "arm-linux-androideabi"
90130
{
91131
println!("cargo:rustc-cfg=kernel_user_helpers")
92132
}
@@ -227,6 +267,8 @@ mod c {
227267
use std::io::Write;
228268
use std::path::{Path, PathBuf};
229269

270+
use super::Target;
271+
230272
struct Sources {
231273
// SYMBOL -> PATH TO SOURCE
232274
map: BTreeMap<&'static str, &'static str>,
@@ -267,11 +309,7 @@ mod c {
267309
}
268310

269311
/// Compile intrinsics from the compiler-rt C source code
270-
pub fn compile(llvm_target: &[&str], target: &String) {
271-
let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
272-
let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
273-
let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
274-
let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
312+
pub fn compile(llvm_target: &[&str], target: &Target) {
275313
let mut consider_float_intrinsics = true;
276314
let cfg = &mut cc::Build::new();
277315

@@ -280,7 +318,7 @@ mod c {
280318
//
281319
// Therefore, evaluate if those flags are present and set a boolean that causes any
282320
// compiler-rt intrinsics that contain floating point source to be excluded for this target.
283-
if target_arch == "aarch64" {
321+
if target.arch == "aarch64" {
284322
let cflags_key = String::from("CFLAGS_") + &(target.to_owned().replace("-", "_"));
285323
if let Ok(cflags_value) = env::var(cflags_key) {
286324
if cflags_value.contains("+nofp") || cflags_value.contains("+nosimd") {
@@ -299,7 +337,7 @@ mod c {
299337

300338
cfg.warnings(false);
301339

302-
if target_env == "msvc" {
340+
if target.env == "msvc" {
303341
// Don't pull in extra libraries on MSVC
304342
cfg.flag("/Zl");
305343

@@ -328,7 +366,7 @@ mod c {
328366
// at odds with compiling with `-ffreestanding`, as the header
329367
// may be incompatible or not present. Create a minimal stub
330368
// header to use instead.
331-
if target_os == "uefi" {
369+
if target.os == "uefi" {
332370
let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
333371
let include_dir = out_dir.join("include");
334372
if !include_dir.exists() {
@@ -373,7 +411,7 @@ mod c {
373411

374412
// On iOS and 32-bit OSX these are all just empty intrinsics, no need to
375413
// include them.
376-
if target_vendor != "apple" || target_arch != "x86" {
414+
if target.vendor != "apple" || target.arch != "x86" {
377415
sources.extend(&[
378416
("__absvti2", "absvti2.c"),
379417
("__addvti3", "addvti3.c"),
@@ -392,7 +430,7 @@ mod c {
392430
}
393431
}
394432

395-
if target_vendor == "apple" {
433+
if target.vendor == "apple" {
396434
sources.extend(&[
397435
("atomic_flag_clear", "atomic_flag_clear.c"),
398436
("atomic_flag_clear_explicit", "atomic_flag_clear_explicit.c"),
@@ -406,8 +444,8 @@ mod c {
406444
]);
407445
}
408446

409-
if target_env != "msvc" {
410-
if target_arch == "x86" {
447+
if target.env != "msvc" {
448+
if target.arch == "x86" {
411449
sources.extend(&[
412450
("__ashldi3", "i386/ashldi3.S"),
413451
("__ashrdi3", "i386/ashrdi3.S"),
@@ -421,7 +459,7 @@ mod c {
421459
}
422460
}
423461

424-
if target_arch == "arm" && target_vendor != "apple" && target_env != "msvc" {
462+
if target.arch == "arm" && target.vendor != "apple" && target.env != "msvc" {
425463
sources.extend(&[
426464
("__aeabi_div0", "arm/aeabi_div0.c"),
427465
("__aeabi_drsub", "arm/aeabi_drsub.c"),
@@ -441,7 +479,7 @@ mod c {
441479
("__umodsi3", "arm/umodsi3.S"),
442480
]);
443481

444-
if target_os == "freebsd" {
482+
if target.os == "freebsd" {
445483
sources.extend(&[("__clear_cache", "clear_cache.c")]);
446484
}
447485

@@ -513,7 +551,7 @@ mod c {
513551
]);
514552
}
515553

516-
if (target_arch == "aarch64" || target_arch == "arm64ec") && consider_float_intrinsics {
554+
if (target.arch == "aarch64" || target.arch == "arm64ec") && consider_float_intrinsics {
517555
sources.extend(&[
518556
("__comparetf2", "comparetf2.c"),
519557
("__floatditf", "floatditf.c"),
@@ -526,16 +564,16 @@ mod c {
526564
("__fe_raise_inexact", "fp_mode.c"),
527565
]);
528566

529-
if target_os != "windows" {
567+
if target.os != "windows" {
530568
sources.extend(&[("__multc3", "multc3.c")]);
531569
}
532570
}
533571

534-
if target_arch == "mips" || target_arch == "riscv32" || target_arch == "riscv64" {
572+
if target.arch == "mips" || target.arch == "riscv32" || target.arch == "riscv64" {
535573
sources.extend(&[("__bswapsi2", "bswapsi2.c")]);
536574
}
537575

538-
if target_arch == "mips64" {
576+
if target.arch == "mips64" {
539577
sources.extend(&[
540578
("__netf2", "comparetf2.c"),
541579
("__floatsitf", "floatsitf.c"),
@@ -544,7 +582,7 @@ mod c {
544582
]);
545583
}
546584

547-
if target_arch == "loongarch64" {
585+
if target.arch == "loongarch64" {
548586
sources.extend(&[
549587
("__netf2", "comparetf2.c"),
550588
("__floatsitf", "floatsitf.c"),
@@ -554,7 +592,7 @@ mod c {
554592
}
555593

556594
// Remove the assembly implementations that won't compile for the target
557-
if llvm_target[0] == "thumbv6m" || llvm_target[0] == "thumbv8m.base" || target_os == "uefi"
595+
if llvm_target[0] == "thumbv6m" || llvm_target[0] == "thumbv8m.base" || target.os == "uefi"
558596
{
559597
let mut to_remove = Vec::new();
560598
for (k, v) in sources.map.iter() {
@@ -570,7 +608,7 @@ mod c {
570608
}
571609

572610
// Android uses emulated TLS so we need a runtime support function.
573-
if target_os == "android" {
611+
if target.os == "android" {
574612
sources.extend(&[("__emutls_get_address", "emutls.c")]);
575613

576614
// Work around a bug in the NDK headers (fixed in
@@ -580,7 +618,7 @@ mod c {
580618
}
581619

582620
// OpenHarmony also uses emulated TLS.
583-
if target_env == "ohos" {
621+
if target.env == "ohos" {
584622
sources.extend(&[("__emutls_get_address", "emutls.c")]);
585623
}
586624

@@ -607,7 +645,7 @@ mod c {
607645
// sets of flags to the same source file.
608646
// Note: Out-of-line aarch64 atomics are not supported by the msvc toolchain (#430).
609647
let src_dir = root.join("lib/builtins");
610-
if target_arch == "aarch64" && target_env != "msvc" {
648+
if target.arch == "aarch64" && target.env != "msvc" {
611649
// See below for why we're building these as separate libraries.
612650
build_aarch64_out_of_line_atomics_libraries(&src_dir, cfg);
613651

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