mirror of https://github.com/rust-lang/rust.git
42 lines
1.3 KiB
Rust
42 lines
1.3 KiB
Rust
//! Check that `no_std` binaries can link and run without depending on `libstd`.
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//@ run-pass
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//@ compile-flags: -Cpanic=abort
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//@ ignore-wasm different `main` convention
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#![no_std]
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#![no_main]
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use core::ffi::{c_char, c_int};
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use core::panic::PanicInfo;
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// # Linux
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//
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// Linking `libc` is required by crt1.o, otherwise the linker fails with:
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// > /usr/bin/ld: in function `_start': undefined reference to `__libc_start_main'
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//
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// # Apple
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//
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// Linking `libSystem` is required, otherwise the linker fails with:
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// > ld: dynamic executables or dylibs must link with libSystem.dylib
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//
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// With the new linker introduced in Xcode 15, the error is instead:
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// > Undefined symbols: "dyld_stub_binder", referenced from: <initial-undefines>
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//
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// This _can_ be worked around by raising the deployment target with
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// MACOSX_DEPLOYMENT_TARGET=13.0, though it's a bit hard to test that while
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// still allowing the test suite to support running with older Xcode versions.
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#[cfg_attr(all(not(target_vendor = "apple"), unix), link(name = "c"))]
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#[cfg_attr(target_vendor = "apple", link(name = "System"))]
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extern "C" {}
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#[panic_handler]
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fn panic_handler(_info: &PanicInfo<'_>) -> ! {
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loop {}
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}
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#[no_mangle]
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extern "C" fn main(_argc: c_int, _argv: *const *const c_char) -> c_int {
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0
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}
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