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1ae4a0cc34
Migrate the standard library from using the external `cfg_if` crate to
using the now-built-in `cfg_select` macro.
This does not yet eliminate the dependency from
`library/std/Cargo.toml`, because while the standard library itself no
longer uses `cfg_if`, it also incorporates the `backtrace` crate, which
does.
Migration assisted by the following vim command (after selecting the
full `cfg_if!` invocation):
```
'<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e
```
This is imperfect, but substantially accelerated the process. This
prompts for confirmation on the `} else {` since that can also appear
inside one of the arms. This also requires manual intervention to handle
any multi-line conditions.
200 lines
6.2 KiB
Rust
200 lines
6.2 KiB
Rust
#![no_std]
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#![unstable(feature = "panic_unwind", issue = "32837")]
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#![feature(cfg_emscripten_wasm_eh)]
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#![feature(cfg_select)]
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#![feature(link_cfg)]
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#![feature(staged_api)]
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#![cfg_attr(not(target_env = "msvc"), feature(libc))]
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#![cfg_attr(
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all(target_family = "wasm", any(not(target_os = "emscripten"), emscripten_wasm_eh)),
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feature(simd_wasm64, wasm_exception_handling_intrinsics)
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)]
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#![allow(internal_features)]
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#![deny(unsafe_op_in_unsafe_fn)]
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// Force libc to be included even if unused. This is required by many platforms.
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#[cfg(not(all(windows, target_env = "msvc")))]
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extern crate libc as _;
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cfg_select! {
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target_env = "msvc" => {
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// Windows MSVC no extra unwinder support needed
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}
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any(
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target_os = "l4re",
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target_os = "none",
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target_os = "espidf",
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target_os = "nuttx",
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) => {
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// These "unix" family members do not have unwinder.
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}
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any(
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unix,
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windows,
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target_os = "psp",
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target_os = "solid_asp3",
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all(target_vendor = "fortanix", target_env = "sgx"),
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) => {
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mod libunwind;
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pub use libunwind::*;
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}
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target_os = "xous" => {
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mod unwinding;
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pub use unwinding::*;
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}
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target_family = "wasm" => {
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mod wasm;
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pub use wasm::*;
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}
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_ => {
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// no unwinder on the system!
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// - os=none ("bare metal" targets)
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// - os=hermit
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// - os=uefi
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// - os=cuda
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// - nvptx64-nvidia-cuda
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// - Any new targets not listed above.
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}
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}
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#[cfg(target_env = "musl")]
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cfg_select! {
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all(feature = "llvm-libunwind", feature = "system-llvm-libunwind") => {
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compile_error!("`llvm-libunwind` and `system-llvm-libunwind` cannot be enabled at the same time");
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}
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feature = "llvm-libunwind" => {
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#[link(name = "unwind", kind = "static", modifiers = "-bundle")]
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unsafe extern "C" {}
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}
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feature = "system-llvm-libunwind" => {
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#[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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}
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_ => {
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#[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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}
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}
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// This is the same as musl except that we default to using the system libunwind
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// instead of libgcc.
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#[cfg(target_env = "ohos")]
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cfg_select! {
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all(feature = "llvm-libunwind", feature = "system-llvm-libunwind") => {
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compile_error!("`llvm-libunwind` and `system-llvm-libunwind` cannot be enabled at the same time");
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}
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feature = "llvm-libunwind" => {
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#[link(name = "unwind", kind = "static", modifiers = "-bundle")]
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unsafe extern "C" {}
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}
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_ => {
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#[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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}
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}
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#[cfg(target_os = "android")]
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cfg_select! {
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feature = "llvm-libunwind" => {
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compile_error!("`llvm-libunwind` is not supported for Android targets");
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}
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_ => {
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#[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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}
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}
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// Android's unwinding library depends on dl_iterate_phdr in `libdl`.
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#[cfg(target_os = "android")]
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#[link(name = "dl", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "dl", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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// When building with crt-static, we get `gcc_eh` from the `libc` crate, since
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// glibc needs it, and needs it listed later on the linker command line. We
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// don't want to duplicate it here.
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#[cfg(all(
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target_os = "linux",
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any(target_env = "gnu", target_env = "uclibc"),
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not(feature = "llvm-libunwind"),
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not(feature = "system-llvm-libunwind")
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))]
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#[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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#[cfg(all(
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target_os = "linux",
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any(target_env = "gnu", target_env = "uclibc"),
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not(feature = "llvm-libunwind"),
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feature = "system-llvm-libunwind"
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))]
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#[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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#[cfg(target_os = "redox")]
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#[link(name = "gcc_eh", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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#[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
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#[link(name = "unwind", kind = "static", modifiers = "-bundle")]
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unsafe extern "C" {}
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#[cfg(target_os = "netbsd")]
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#[link(name = "gcc_s")]
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unsafe extern "C" {}
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#[cfg(target_os = "freebsd")]
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#[link(name = "gcc", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "gcc_eh", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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#[cfg(all(target_os = "openbsd", target_arch = "sparc64"))]
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#[link(name = "gcc")]
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unsafe extern "C" {}
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#[cfg(all(target_os = "openbsd", not(target_arch = "sparc64")))]
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#[link(name = "c++abi")]
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unsafe extern "C" {}
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#[cfg(any(target_os = "solaris", target_os = "illumos"))]
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#[link(name = "gcc_s")]
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unsafe extern "C" {}
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#[cfg(target_os = "dragonfly")]
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#[link(name = "gcc_pic")]
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unsafe extern "C" {}
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#[cfg(target_os = "haiku")]
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#[link(name = "gcc_s")]
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unsafe extern "C" {}
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#[cfg(target_os = "aix")]
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#[link(name = "unwind")]
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unsafe extern "C" {}
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#[cfg(target_os = "nto")]
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cfg_select! {
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target_env = "nto70" => {
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#[link(name = "gcc")]
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unsafe extern "C" {}
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}
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_ => {
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#[link(name = "gcc_s")]
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unsafe extern "C" {}
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}
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}
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#[cfg(target_os = "hurd")]
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#[link(name = "gcc_s")]
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unsafe extern "C" {}
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#[cfg(all(target_os = "windows", target_env = "gnu", target_abi = "llvm"))]
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#[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
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#[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
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unsafe extern "C" {}
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