mirror of https://github.com/rust-lang/rust
53 lines
1.5 KiB
Rust
53 lines
1.5 KiB
Rust
//@ build-pass
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//@ revisions: avr msp430
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//
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//@ [avr] needs-llvm-components: avr
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//@ [avr] compile-flags: --target=avr-unknown-gnu-atmega328 --crate-type=rlib
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//@ [msp430] needs-llvm-components: msp430
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//@ [msp430] compile-flags: --target=msp430-none-elf --crate-type=rlib
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#![feature(no_core, lang_items, intrinsics, staged_api, rustc_attrs)]
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#![no_core]
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#![crate_type = "lib"]
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#![stable(feature = "intrinsics_for_test", since = "3.3.3")]
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#![allow(dead_code)]
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// Test that the repr(C) attribute doesn't break compilation
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// Previous bad assumption was that 32-bit enum default width is fine on msp430, avr
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// But the width of the C int on these platforms is 16 bits, and C enums <= C int range
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// so we want no more than that, usually. This resulted in errors like
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// "layout decided on a larger discriminant type (I32) than typeck (I16)"
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#[repr(C)]
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enum Foo {
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Bar,
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}
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extern "rust-intrinsic" {
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#[stable(feature = "intrinsics_for_test", since = "3.3.3")]
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#[rustc_const_stable(feature = "intrinsics_for_test", since = "3.3.3")]
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#[rustc_safe_intrinsic]
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fn size_of<T>() -> usize;
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}
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#[lang="sized"]
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trait Sized {}
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#[lang="copy"]
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trait Copy {}
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const EXPECTED: usize = 2;
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const ACTUAL: usize = size_of::<Foo>();
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// Validate that the size is indeed 16 bits, to match this C static_assert:
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/**
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```c
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#include <assert.h>
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enum foo {
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BAR
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};
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int main(void)
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{
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/* passes on msp430-elf-gcc */
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static_assert(sizeof(enum foo) == 2);
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}
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```
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*/
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const _: [(); EXPECTED] = [(); ACTUAL];
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