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[rust.git] / library / unwind / build.rs
1 use std::env;
2
3 fn main() {
4     println!("cargo:rerun-if-changed=build.rs");
5     println!("cargo:rerun-if-env-changed=CARGO_CFG_MIRI");
6
7     if env::var_os("CARGO_CFG_MIRI").is_some() {
8         // Miri doesn't need the linker flags or a libunwind build.
9         return;
10     }
11
12     let target = env::var("TARGET").expect("TARGET was not set");
13     if target.contains("android") {
14         let build = cc::Build::new();
15
16         // Since ndk r23 beta 3 `libgcc` was replaced with `libunwind` thus
17         // check if we have `libunwind` available and if so use it. Otherwise
18         // fall back to `libgcc` to support older ndk versions.
19         let has_unwind = build.is_flag_supported("-lunwind").expect("Unable to invoke compiler");
20
21         if has_unwind {
22             println!("cargo:rustc-cfg=feature=\"system-llvm-libunwind\"");
23         }
24     } else if target.contains("freebsd") {
25         println!("cargo:rustc-link-lib=gcc_s");
26     } else if target.contains("netbsd") {
27         println!("cargo:rustc-link-lib=gcc_s");
28     } else if target.contains("openbsd") {
29         if target.contains("sparc64") {
30             println!("cargo:rustc-link-lib=gcc");
31         } else {
32             println!("cargo:rustc-link-lib=c++abi");
33         }
34     } else if target.contains("solaris") {
35         println!("cargo:rustc-link-lib=gcc_s");
36     } else if target.contains("illumos") {
37         println!("cargo:rustc-link-lib=gcc_s");
38     } else if target.contains("dragonfly") {
39         println!("cargo:rustc-link-lib=gcc_pic");
40     } else if target.ends_with("pc-windows-gnu") {
41         // This is handled in the target spec with late_link_args_[static|dynamic]
42     } else if target.contains("uwp-windows-gnu") {
43         println!("cargo:rustc-link-lib=unwind");
44     } else if target.contains("haiku") {
45         println!("cargo:rustc-link-lib=gcc_s");
46     } else if target.contains("redox") {
47         // redox is handled in lib.rs
48     }
49 }