src/librustc_target/spec/cloudabi_base.rs

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use spec::{LinkArgs, LinkerFlavor, TargetOptions, RelroLevel};
  12
  13 pub fn opts() -> TargetOptions {
  14     let mut args = LinkArgs::new();
  15     args.insert(LinkerFlavor::Gcc, vec![
  16         "-Wl,-Bstatic".to_string(),
  17         "-Wl,--no-dynamic-linker".to_string(),
  18         "-Wl,--eh-frame-hdr".to_string(),
  19         "-Wl,--gc-sections".to_string(),
  20     ]);
  21
  22     TargetOptions {
  23         executables: true,
  24         target_family: None,
  25         linker_is_gnu: true,
  26         pre_link_args: args,
  27         position_independent_executables: true,
  28         // As CloudABI only supports static linkage, there is no need
  29         // for dynamic TLS. The C library therefore does not provide
  30         // __tls_get_addr(), which is normally used to perform dynamic
  31         // TLS lookups by programs that make use of dlopen(). Only the
  32         // "local-exec" and "initial-exec" TLS models can be used.
  33         //
  34         // "local-exec" is more efficient than "initial-exec", as the
  35         // latter has one more level of indirection: it accesses the GOT
  36         // (Global Offset Table) to obtain the effective address of a
  37         // thread-local variable. Using a GOT is useful only when doing
  38         // dynamic linking.
  39         tls_model: "local-exec".to_string(),
  40         relro_level: RelroLevel::Full,
  41         exe_allocation_crate: super::maybe_jemalloc(),
  42         .. Default::default()
  43     }
  44 }