library/unwind/src/lib.rs

   1 #![no_std]
   2 #![unstable(feature = "panic_unwind", issue = "32837")]
   3 #![feature(link_cfg)]
   4 #![cfg_attr(bootstrap, feature(native_link_modifiers_bundle))]
   5 #![feature(staged_api)]
   6 #![feature(c_unwind)]
   7 #![feature(cfg_target_abi)]
   8 #![cfg_attr(not(target_env = "msvc"), feature(libc))]
   9
  10 cfg_if::cfg_if! {
  11     if #[cfg(target_env = "msvc")] {
  12         // Windows MSVC no extra unwinder support needed
  13     } else if #[cfg(any(
  14         target_os = "l4re",
  15         target_os = "none",
  16         target_os = "espidf",
  17     ))] {
  18         // These "unix" family members do not have unwinder.
  19         // Note this also matches x86_64-unknown-none-linuxkernel.
  20     } else if #[cfg(any(
  21         unix,
  22         windows,
  23         target_os = "psp",
  24         target_os = "solid_asp3",
  25         all(target_vendor = "fortanix", target_env = "sgx"),
  26     ))] {
  27         mod libunwind;
  28         pub use libunwind::*;
  29     } else {
  30         // no unwinder on the system!
  31         // - wasm32 (not emscripten, which is "unix" family)
  32         // - os=none ("bare metal" targets)
  33         // - os=hermit
  34         // - os=uefi
  35         // - os=cuda
  36         // - nvptx64-nvidia-cuda
  37         // - Any new targets not listed above.
  38     }
  39 }
  40
  41 #[cfg(target_env = "musl")]
  42 cfg_if::cfg_if! {
  43     if #[cfg(all(feature = "llvm-libunwind", feature = "system-llvm-libunwind"))] {
  44         compile_error!("`llvm-libunwind` and `system-llvm-libunwind` cannot be enabled at the same time");
  45     } else if #[cfg(feature = "llvm-libunwind")] {
  46         #[link(name = "unwind", kind = "static", modifiers = "-bundle")]
  47         extern "C" {}
  48     } else if #[cfg(feature = "system-llvm-libunwind")] {
  49         #[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
  50         #[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
  51         extern "C" {}
  52     } else {
  53         #[link(name = "unwind", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
  54         #[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
  55         extern "C" {}
  56     }
  57 }
  58
  59 // When building with crt-static, we get `gcc_eh` from the `libc` crate, since
  60 // glibc needs it, and needs it listed later on the linker command line. We
  61 // don't want to duplicate it here.
  62 #[cfg(all(
  63     target_os = "linux",
  64     any(target_env = "gnu", target_env = "uclibc"),
  65     not(feature = "llvm-libunwind"),
  66     not(feature = "system-llvm-libunwind")
  67 ))]
  68 #[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
  69 extern "C" {}
  70
  71 #[cfg(all(
  72     target_os = "linux",
  73     any(target_env = "gnu", target_env = "uclibc"),
  74     not(feature = "llvm-libunwind"),
  75     feature = "system-llvm-libunwind"
  76 ))]
  77 #[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
  78 extern "C" {}
  79
  80 #[cfg(target_os = "redox")]
  81 #[link(name = "gcc_eh", kind = "static", modifiers = "-bundle", cfg(target_feature = "crt-static"))]
  82 #[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
  83 extern "C" {}
  84
  85 #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
  86 #[link(name = "unwind", kind = "static", modifiers = "-bundle")]
  87 extern "C" {}
  88
  89 #[cfg(all(target_os = "windows", target_env = "gnu", target_abi = "llvm"))]
  90 #[link(name = "unwind", kind = "static", modifiers = "-bundle")]
  91 extern "C" {}