1 use crate::spec::crt_objects::{self, CrtObjectsFallback};
2 use crate::spec::{LinkArgs, LinkerFlavor, LldFlavor, TargetOptions};
4 pub fn opts() -> TargetOptions {
5 let mut pre_link_args = LinkArgs::new();
9 // Tell GCC to avoid linker plugins, because we are not bundling
10 // them with Windows installer, and Rust does its own LTO anyways.
11 "-fno-use-linker-plugin".to_string(),
12 // Always enable DEP (NX bit) when it is available
13 "-Wl,--nxcompat".to_string(),
15 "-Wl,--dynamicbase".to_string(),
16 // ASLR will rebase it anyway so leaving that option enabled only leads to confusion
17 "-Wl,--disable-auto-image-base".to_string(),
21 let mut late_link_args = LinkArgs::new();
22 let mut late_link_args_dynamic = LinkArgs::new();
23 let mut late_link_args_static = LinkArgs::new();
24 // Order of `late_link_args*` was found through trial and error to work with various
25 // mingw-w64 versions (not tested on the CI). It's expected to change from time to time.
26 let mingw_libs = vec![
27 "-lmsvcrt".to_string(),
28 "-lmingwex".to_string(),
29 "-lmingw32".to_string(),
30 "-lgcc".to_string(), // alas, mingw* libraries above depend on libgcc
31 // mingw's msvcrt is a weird hybrid import library and static library.
32 // And it seems that the linker fails to use import symbols from msvcrt
33 // that are required from functions in msvcrt in certain cases. For example
34 // `_fmode` that is used by an implementation of `__p__fmode` in x86_64.
35 // The library is purposely listed twice to fix that.
37 // See https://github.com/rust-lang/rust/pull/47483 for some more details.
38 "-lmsvcrt".to_string(),
39 "-luser32".to_string(),
40 "-lkernel32".to_string(),
42 late_link_args.insert(LinkerFlavor::Gcc, mingw_libs.clone());
43 late_link_args.insert(LinkerFlavor::Lld(LldFlavor::Ld), mingw_libs);
44 let dynamic_unwind_libs = vec![
45 // If any of our crates are dynamically linked then we need to use
46 // the shared libgcc_s-dw2-1.dll. This is required to support
47 // unwinding across DLL boundaries.
48 "-lgcc_s".to_string(),
50 late_link_args_dynamic.insert(LinkerFlavor::Gcc, dynamic_unwind_libs.clone());
51 late_link_args_dynamic.insert(LinkerFlavor::Lld(LldFlavor::Ld), dynamic_unwind_libs);
52 let static_unwind_libs = vec![
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 "-lgcc_eh".to_string(),
59 "-l:libpthread.a".to_string(),
61 late_link_args_static.insert(LinkerFlavor::Gcc, static_unwind_libs.clone());
62 late_link_args_static.insert(LinkerFlavor::Lld(LldFlavor::Ld), static_unwind_libs);
65 os: "windows".to_string(),
66 env: "gnu".to_string(),
67 vendor: "pc".to_string(),
68 // FIXME(#13846) this should be enabled for windows
69 function_sections: false,
70 linker: Some("gcc".to_string()),
71 dynamic_linking: true,
73 dll_prefix: String::new(),
74 dll_suffix: ".dll".to_string(),
75 exe_suffix: ".exe".to_string(),
76 staticlib_prefix: "lib".to_string(),
77 staticlib_suffix: ".a".to_string(),
78 os_family: Some("windows".to_string()),
79 is_like_windows: true,
80 allows_weak_linkage: false,
82 pre_link_objects: crt_objects::pre_mingw(),
83 post_link_objects: crt_objects::post_mingw(),
84 pre_link_objects_fallback: crt_objects::pre_mingw_fallback(),
85 post_link_objects_fallback: crt_objects::post_mingw_fallback(),
86 crt_objects_fallback: Some(CrtObjectsFallback::Mingw),
88 late_link_args_dynamic,
89 late_link_args_static,
90 abi_return_struct_as_int: true,
91 emit_debug_gdb_scripts: false,
92 requires_uwtable: true,
93 eh_frame_header: false,