compiler/rustc_target/src/spec/windows_gnu_base.rs

   1 use crate::spec::crt_objects::{self, CrtObjectsFallback};
   2 use crate::spec::{cvs, LinkerFlavor, TargetOptions};
   3
   4 pub fn opts() -> TargetOptions {
   5     let mut pre_link_args = TargetOptions::link_args(
   6         LinkerFlavor::Ld,
   7         &[
   8             // Enable ASLR
   9             "--dynamicbase",
  10             // ASLR will rebase it anyway so leaving that option enabled only leads to confusion
  11             "--disable-auto-image-base",
  12         ],
  13     );
  14     super::add_link_args(
  15         &mut pre_link_args,
  16         LinkerFlavor::Gcc,
  17         &[
  18             // Tell GCC to avoid linker plugins, because we are not bundling
  19             // them with Windows installer, and Rust does its own LTO anyways.
  20             "-fno-use-linker-plugin",
  21             "-Wl,--dynamicbase",
  22             "-Wl,--disable-auto-image-base",
  23         ],
  24     );
  25
  26     // Order of `late_link_args*` was found through trial and error to work with various
  27     // mingw-w64 versions (not tested on the CI). It's expected to change from time to time.
  28     let mingw_libs = &[
  29         "-lmsvcrt",
  30         "-lmingwex",
  31         "-lmingw32",
  32         "-lgcc", // alas, mingw* libraries above depend on libgcc
  33         // mingw's msvcrt is a weird hybrid import library and static library.
  34         // And it seems that the linker fails to use import symbols from msvcrt
  35         // that are required from functions in msvcrt in certain cases. For example
  36         // `_fmode` that is used by an implementation of `__p__fmode` in x86_64.
  37         // The library is purposely listed twice to fix that.
  38         //
  39         // See https://github.com/rust-lang/rust/pull/47483 for some more details.
  40         "-lmsvcrt",
  41         "-luser32",
  42         "-lkernel32",
  43     ];
  44     let mut late_link_args = TargetOptions::link_args(LinkerFlavor::Ld, mingw_libs);
  45     super::add_link_args(&mut late_link_args, LinkerFlavor::Gcc, mingw_libs);
  46     // If any of our crates are dynamically linked then we need to use
  47     // the shared libgcc_s-dw2-1.dll. This is required to support
  48     // unwinding across DLL boundaries.
  49     let dynamic_unwind_libs = &["-lgcc_s"];
  50     let mut late_link_args_dynamic =
  51         TargetOptions::link_args(LinkerFlavor::Ld, dynamic_unwind_libs);
  52     super::add_link_args(&mut late_link_args_dynamic, LinkerFlavor::Gcc, dynamic_unwind_libs);
  53     // If all of our crates are statically linked then we can get away
  54     // with statically linking the libgcc unwinding code. This allows
  55     // binaries to be redistributed without the libgcc_s-dw2-1.dll
  56     // dependency, but unfortunately break unwinding across DLL
  57     // boundaries when unwinding across FFI boundaries.
  58     let static_unwind_libs = &["-lgcc_eh", "-l:libpthread.a"];
  59     let mut late_link_args_static = TargetOptions::link_args(LinkerFlavor::Ld, static_unwind_libs);
  60     super::add_link_args(&mut late_link_args_static, LinkerFlavor::Gcc, static_unwind_libs);
  61
  62     TargetOptions {
  63         os: "windows".into(),
  64         env: "gnu".into(),
  65         vendor: "pc".into(),
  66         // FIXME(#13846) this should be enabled for windows
  67         function_sections: false,
  68         linker: Some("gcc".into()),
  69         dynamic_linking: true,
  70         dll_prefix: "".into(),
  71         dll_suffix: ".dll".into(),
  72         exe_suffix: ".exe".into(),
  73         families: cvs!["windows"],
  74         is_like_windows: true,
  75         allows_weak_linkage: false,
  76         pre_link_args,
  77         pre_link_objects: crt_objects::pre_mingw(),
  78         post_link_objects: crt_objects::post_mingw(),
  79         pre_link_objects_fallback: crt_objects::pre_mingw_fallback(),
  80         post_link_objects_fallback: crt_objects::post_mingw_fallback(),
  81         crt_objects_fallback: Some(CrtObjectsFallback::Mingw),
  82         late_link_args,
  83         late_link_args_dynamic,
  84         late_link_args_static,
  85         abi_return_struct_as_int: true,
  86         emit_debug_gdb_scripts: false,
  87         requires_uwtable: true,
  88         eh_frame_header: false,
  89         ..Default::default()
  90     }
  91 }