compiler/rustc_target/src/spec/cloudabi_base.rs

   1 use crate::spec::{LinkArgs, LinkerFlavor, RelroLevel, TargetOptions, TlsModel};
   2
   3 pub fn opts() -> TargetOptions {
   4     let mut args = LinkArgs::new();
   5     args.insert(
   6         LinkerFlavor::Gcc,
   7         vec![
   8             "-Wl,-Bstatic".to_string(),
   9             "-Wl,--no-dynamic-linker".to_string(),
  10             "-Wl,--gc-sections".to_string(),
  11         ],
  12     );
  13
  14     TargetOptions {
  15         os: "cloudabi".to_string(),
  16         executables: true,
  17         os_family: None,
  18         linker_is_gnu: true,
  19         pre_link_args: args,
  20         position_independent_executables: true,
  21         // As CloudABI only supports static linkage, there is no need
  22         // for dynamic TLS. The C library therefore does not provide
  23         // __tls_get_addr(), which is normally used to perform dynamic
  24         // TLS lookups by programs that make use of dlopen(). Only the
  25         // "local-exec" and "initial-exec" TLS models can be used.
  26         //
  27         // "local-exec" is more efficient than "initial-exec", as the
  28         // latter has one more level of indirection: it accesses the GOT
  29         // (Global Offset Table) to obtain the effective address of a
  30         // thread-local variable. Using a GOT is useful only when doing
  31         // dynamic linking.
  32         tls_model: TlsModel::LocalExec,
  33         relro_level: RelroLevel::Full,
  34         ..Default::default()
  35     }
  36 }