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Invoke backtrace-rs' buildscript in std's buildscript for Android targets #99883

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Invoke backtrace-rs' buildscript in std's buildscript for Android targets #99883

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986c211
Invoke `backtrace-rs`' buildscript in `std`'s buildscript
Arc-blroth Jul 29, 2022
5e8e7f4
add cc build dependency for backtrace support in std
Arc-blroth Jul 29, 2022
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1 change: 1 addition & 0 deletions Cargo.lock
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Original file line number Diff line number Diff line change
Expand Up @@ -5042,6 +5042,7 @@ version = "0.0.0"
dependencies = [
"addr2line 0.16.0",
"alloc",
"cc",
"cfg-if 0.1.10",
"compiler_builtins",
"core",
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4 changes: 4 additions & 0 deletions library/std/Cargo.toml
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Expand Up @@ -35,6 +35,10 @@ features = ['read_core', 'elf', 'macho', 'pe', 'unaligned', 'archive']
[dev-dependencies]
rand = "0.7"

[build-dependencies]
# Dependency of the `backtrace` crate
cc = "1.0.67"

[target.'cfg(any(all(target_family = "wasm", not(target_os = "emscripten")), all(target_vendor = "fortanix", target_env = "sgx")))'.dependencies]
dlmalloc = { version = "0.2.3", features = ['rustc-dep-of-std'] }

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16 changes: 16 additions & 0 deletions library/std/build.rs
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@@ -1,5 +1,19 @@
use std::env;

// backtrace-rs requires a feature check on Android targets, so
// we need to run its build.rs as well. Note that we use an
// include! rather than #[path = ""] because backtrace-rs's main
// function is private.
#[allow(unused_extern_crates)]
mod backtrace_rs_build_rs {
include!("../backtrace/build.rs");

#[inline]
pub fn call_main() {
main();
}
}

fn main() {
println!("cargo:rerun-if-changed=build.rs");
let target = env::var("TARGET").expect("TARGET was not set");
Expand Down Expand Up @@ -49,4 +63,6 @@ fn main() {
}
println!("cargo:rustc-env=STD_ENV_ARCH={}", env::var("CARGO_CFG_TARGET_ARCH").unwrap());
println!("cargo:rustc-cfg=backtrace_in_libstd");

backtrace_rs_build_rs::call_main();
}
4 changes: 4 additions & 0 deletions library/std/src/android-api.c
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@@ -0,0 +1,4 @@
// Used from backtrace-rs' build script to detect the value of the `__ANDROID_API__`
// builtin #define

APIVERSION __ANDROID_API__
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@pitaj pitaj May 6, 2023 •
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Seems a little messy to have to duplicate this file. Can we instead modify backtrace-rs/build.rs to make it directory-independent somehow?

Maybe change it to have pub fn main instead and define the module like

#[path = "../backtrace/build.rs"]
mod backtrace_build_rs;

And then it can just do

use std::path::Path;

fn build_android() {
    let android_api_c = Path::new(file!()).parent().unwrap().join("src/android-api.c");
    let expansion = match cc::Build::new().file(android_api_c).try_expand() {
        // ...