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Improve android-ndk property interface
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PR rust-lang#102332 added support for NDK r25b, and removed support for r15. Since
the switch to r25b would have broken existing r15 users anyway, let's
take the opportunity to make the interface more user friendly.

Firstly move the android-ndk property to [build] instead of the
targets. This is possible now that the NDK has obsoleted the concept of
target-specific toolchains.

Also make the property take the NDK root directory instead of the
"toolchains/llvm/prebuilt/<host tag>" subdirectory.
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pcc committed Dec 10, 2022
1 parent 6f04af4 commit f19e8b0
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Showing 6 changed files with 62 additions and 74 deletions.
9 changes: 3 additions & 6 deletions config.toml.example
Original file line number Diff line number Diff line change
Expand Up @@ -341,6 +341,9 @@ changelog-seen = 2
# this is not intended to be used during local development.
#metrics = false

# Specify the location of the Android NDK. Used when targeting Android.
#android-ndk = "/path/to/android-ndk-r25b"

# =============================================================================
# General install configuration options
# =============================================================================
Expand Down Expand Up @@ -708,12 +711,6 @@ changelog-seen = 2
# it must link to `libgcc_eh.a` to get a working output, and this option have no effect.
#llvm-libunwind = 'no' if Linux, 'in-tree' if Fuchsia

# If this target is for Android, this option will be required to specify where
# the NDK for the target lives. This is used to find the C compiler to link and
# build native code.
# See `src/bootstrap/cc_detect.rs` for details.
#android-ndk = <none> (path)

# Build the sanitizer runtimes for this target.
# This option will override the same option under [build] section.
#sanitizers = build.sanitizers (bool)
Expand Down
74 changes: 44 additions & 30 deletions src/bootstrap/cc_detect.rs
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ use std::path::{Path, PathBuf};
use std::process::Command;
use std::{env, iter};

use crate::config::{Target, TargetSelection};
use crate::config::TargetSelection;
use crate::util::output;
use crate::{Build, CLang, GitRepo};

Expand Down Expand Up @@ -100,10 +100,11 @@ pub fn find(build: &mut Build) {
for target in targets.into_iter() {
let mut cfg = new_cc_build(build, target);
let config = build.config.target_config.get(&target);
if let Some(cc) = config.and_then(|c| c.cc.as_ref()) {
if let Some(cc) = config
.and_then(|c| c.cc.clone())
.or_else(|| default_compiler(&mut cfg, Language::C, target, build))
{
cfg.compiler(cc);
} else {
set_compiler(&mut cfg, Language::C, target, config, build);
}

let compiler = cfg.get_compiler();
Expand All @@ -120,12 +121,12 @@ pub fn find(build: &mut Build) {
// We'll need one anyways if the target triple is also a host triple
let mut cfg = new_cc_build(build, target);
cfg.cpp(true);
let cxx_configured = if let Some(cxx) = config.and_then(|c| c.cxx.as_ref()) {
let cxx_configured = if let Some(cxx) = config
.and_then(|c| c.cxx.clone())
.or_else(|| default_compiler(&mut cfg, Language::CPlusPlus, target, build))
{
cfg.compiler(cxx);
true
} else if build.hosts.contains(&target) || build.build == target {
set_compiler(&mut cfg, Language::CPlusPlus, target, config, build);
true
} else {
// Use an auto-detected compiler (or one configured via `CXX_target_triple` env vars).
cfg.try_get_compiler().is_ok()
Expand Down Expand Up @@ -155,68 +156,70 @@ pub fn find(build: &mut Build) {
}
}

fn set_compiler(
fn default_compiler(
cfg: &mut cc::Build,
compiler: Language,
target: TargetSelection,
config: Option<&Target>,
build: &Build,
) {
) -> Option<PathBuf> {
match &*target.triple {
// When compiling for android we may have the NDK configured in the
// config.toml in which case we look there. Otherwise the default
// compiler already takes into account the triple in question.
t if t.contains("android") => {
if let Some(ndk) = config.and_then(|c| c.ndk.as_ref()) {
cfg.compiler(ndk_compiler(compiler, &*target.triple, ndk));
}
}
t if t.contains("android") => build
.config
.android_ndk
.as_ref()
.map(|ndk| ndk_compiler(compiler, &*target.triple, ndk)),

// The default gcc version from OpenBSD may be too old, try using egcc,
// which is a gcc version from ports, if this is the case.
t if t.contains("openbsd") => {
let c = cfg.get_compiler();
let gnu_compiler = compiler.gcc();
if !c.path().ends_with(gnu_compiler) {
return;
return None;
}

let output = output(c.to_command().arg("--version"));
let i = match output.find(" 4.") {
Some(i) => i,
None => return,
};
let i = output.find(" 4.")?;
match output[i + 3..].chars().next().unwrap() {
'0'..='6' => {}
_ => return,
_ => return None,
}
let alternative = format!("e{}", gnu_compiler);
if Command::new(&alternative).output().is_ok() {
cfg.compiler(alternative);
Some(PathBuf::from(alternative))
} else {
None
}
}

"mips-unknown-linux-musl" => {
if cfg.get_compiler().path().to_str() == Some("gcc") {
cfg.compiler("mips-linux-musl-gcc");
Some(PathBuf::from("mips-linux-musl-gcc"))
} else {
None
}
}
"mipsel-unknown-linux-musl" => {
if cfg.get_compiler().path().to_str() == Some("gcc") {
cfg.compiler("mipsel-linux-musl-gcc");
Some(PathBuf::from("mipsel-linux-musl-gcc"))
} else {
None
}
}

t if t.contains("musl") => {
if let Some(root) = build.musl_root(target) {
let guess = root.join("bin/musl-gcc");
if guess.exists() {
cfg.compiler(guess);
}
if guess.exists() { Some(guess) } else { None }
} else {
None
}
}

_ => {}
_ => None,
}
}

Expand All @@ -237,7 +240,18 @@ pub(crate) fn ndk_compiler(compiler: Language, triple: &str, ndk: &Path) -> Path
let api_level =
if triple.contains("aarch64") || triple.contains("x86_64") { "21" } else { "19" };
let compiler = format!("{}{}-{}", triple_translated, api_level, compiler.clang());
ndk.join("bin").join(compiler)
let host_tag = if cfg!(target_os = "macos") {
// The NDK uses universal binaries, so this is correct even on ARM.
"darwin-x86_64"
} else if cfg!(target_os = "windows") {
"windows-x86_64"
} else {
// NDK r25b only has official releases for macOS, Windows and Linux.
// Try the Linux directory everywhere else, on the assumption that the OS has an
// emulation layer that can cope (e.g. BSDs).
"linux-x86_64"
};
ndk.join("toolchains").join("llvm").join("prebuilt").join(host_tag).join("bin").join(compiler)
}

/// The target programming language for a native compiler.
Expand Down
29 changes: 12 additions & 17 deletions src/bootstrap/config.rs
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,6 @@ use std::str::FromStr;

use crate::builder::TaskPath;
use crate::cache::{Interned, INTERNER};
use crate::cc_detect::{ndk_compiler, Language};
use crate::channel::{self, GitInfo};
pub use crate::flags::Subcommand;
use crate::flags::{Color, Flags};
Expand Down Expand Up @@ -84,6 +83,7 @@ pub struct Config {
pub color: Color,
pub patch_binaries_for_nix: bool,
pub stage0_metadata: Stage0Metadata,
pub android_ndk: Option<PathBuf>,

pub on_fail: Option<String>,
pub stage: u32,
Expand Down Expand Up @@ -436,7 +436,6 @@ pub struct Target {
pub ranlib: Option<PathBuf>,
pub default_linker: Option<PathBuf>,
pub linker: Option<PathBuf>,
pub ndk: Option<PathBuf>,
pub sanitizers: Option<bool>,
pub profiler: Option<bool>,
pub crt_static: Option<bool>,
Expand Down Expand Up @@ -636,6 +635,7 @@ define_config! {
bench_stage: Option<u32> = "bench-stage",
patch_binaries_for_nix: Option<bool> = "patch-binaries-for-nix",
metrics: Option<bool> = "metrics",
android_ndk: Option<PathBuf> = "android-ndk",
}
}

Expand Down Expand Up @@ -777,7 +777,6 @@ define_config! {
llvm_has_rust_patches: Option<bool> = "llvm-has-rust-patches",
llvm_filecheck: Option<String> = "llvm-filecheck",
llvm_libunwind: Option<String> = "llvm-libunwind",
android_ndk: Option<String> = "android-ndk",
sanitizers: Option<bool> = "sanitizers",
profiler: Option<bool> = "profiler",
crt_static: Option<bool> = "crt-static",
Expand Down Expand Up @@ -863,11 +862,13 @@ impl Config {
// We still support running outside the repository if we find we aren't in a git directory.
cmd.arg("rev-parse").arg("--show-toplevel");
// Discard stderr because we expect this to fail when building from a tarball.
let output = cmd
.stderr(std::process::Stdio::null())
.output()
.ok()
.and_then(|output| if output.status.success() { Some(output) } else { None });
let output = cmd.stderr(std::process::Stdio::null()).output().ok().and_then(|output| {
if output.status.success() {
Some(output)
} else {
None
}
});
if let Some(output) = output {
let git_root = String::from_utf8(output.stdout).unwrap();
// We need to canonicalize this path to make sure it uses backslashes instead of forward slashes.
Expand Down Expand Up @@ -1008,6 +1009,7 @@ impl Config {
config.python = build.python.map(PathBuf::from);
config.reuse = build.reuse.map(PathBuf::from);
config.submodules = build.submodules;
config.android_ndk = build.android_ndk;
set(&mut config.low_priority, build.low_priority);
set(&mut config.compiler_docs, build.compiler_docs);
set(&mut config.docs_minification, build.docs_minification);
Expand Down Expand Up @@ -1235,18 +1237,11 @@ impl Config {
.llvm_libunwind
.as_ref()
.map(|v| v.parse().expect("failed to parse rust.llvm-libunwind"));
if let Some(ref s) = cfg.android_ndk {
target.ndk = Some(config.src.join(s));
}
if let Some(s) = cfg.no_std {
target.no_std = s;
}
target.cc = cfg.cc.map(PathBuf::from).or_else(|| {
target.ndk.as_ref().map(|ndk| ndk_compiler(Language::C, &triple, ndk))
});
target.cxx = cfg.cxx.map(PathBuf::from).or_else(|| {
target.ndk.as_ref().map(|ndk| ndk_compiler(Language::CPlusPlus, &triple, ndk))
});
target.cc = cfg.cc.map(PathBuf::from);
target.cxx = cfg.cxx.map(PathBuf::from);
target.ar = cfg.ar.map(PathBuf::from);
target.ranlib = cfg.ranlib.map(PathBuf::from);
target.linker = cfg.linker.map(PathBuf::from);
Expand Down
15 changes: 1 addition & 14 deletions src/bootstrap/configure.py
Original file line number Diff line number Diff line change
Expand Up @@ -98,20 +98,7 @@ def v(*args):
v("llvm-config", None, "set path to llvm-config")
v("llvm-filecheck", None, "set path to LLVM's FileCheck utility")
v("python", "build.python", "set path to python")
v("android-cross-path", "target.arm-linux-androideabi.android-ndk",
"Android NDK standalone path (deprecated)")
v("i686-linux-android-ndk", "target.i686-linux-android.android-ndk",
"i686-linux-android NDK standalone path")
v("arm-linux-androideabi-ndk", "target.arm-linux-androideabi.android-ndk",
"arm-linux-androideabi NDK standalone path")
v("armv7-linux-androideabi-ndk", "target.armv7-linux-androideabi.android-ndk",
"armv7-linux-androideabi NDK standalone path")
v("thumbv7neon-linux-androideabi-ndk", "target.thumbv7neon-linux-androideabi.android-ndk",
"thumbv7neon-linux-androideabi NDK standalone path")
v("aarch64-linux-android-ndk", "target.aarch64-linux-android.android-ndk",
"aarch64-linux-android NDK standalone path")
v("x86_64-linux-android-ndk", "target.x86_64-linux-android.android-ndk",
"x86_64-linux-android NDK standalone path")
v("android-ndk", "build.android-ndk", "set path to Android NDK")
v("musl-root", "target.x86_64-unknown-linux-musl.musl-root",
"MUSL root installation directory (deprecated)")
v("musl-root-x86_64", "target.x86_64-unknown-linux-musl.musl-root",
Expand Down
2 changes: 1 addition & 1 deletion src/ci/docker/host-x86_64/arm-android/Dockerfile
Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ ENV PATH=$PATH:/android/sdk/platform-tools

ENV TARGETS=arm-linux-androideabi

ENV RUST_CONFIGURE_ARGS --arm-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/
ENV RUST_CONFIGURE_ARGS --android-ndk=/android/ndk/

ENV SCRIPT python3 ../x.py --stage 2 test --host='' --target $TARGETS

Expand Down
7 changes: 1 addition & 6 deletions src/ci/docker/host-x86_64/dist-android/Dockerfile
Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,7 @@ ENV TARGETS=$TARGETS,x86_64-linux-android
ENV RUST_CONFIGURE_ARGS \
--enable-extended \
--enable-profiler \
--arm-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
--armv7-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
--thumbv7neon-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
--i686-linux-android-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
--aarch64-linux-android-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
--x86_64-linux-android-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
--android-ndk=/android/ndk/ \
--disable-docs

ENV SCRIPT python3 ../x.py dist --host='' --target $TARGETS
Expand Down

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