use std::env;
use crate::spec::{LinkArgs, TargetOptions};
pub fn opts() -> TargetOptions {
// ELF TLS is only available in macOS 10.7+. If you try to compile for 10.6
// either the linker will complain if it is used or the binary will end up
// segfaulting at runtime when run on 10.6. Rust by default supports macOS
// 10.7+, but there is a standard environment variable,
// MACOSX_DEPLOYMENT_TARGET, which is used to signal targeting older
// versions of macOS. For example compiling on 10.10 with
// MACOSX_DEPLOYMENT_TARGET set to 10.6 will cause the linker to generate
// warnings about the usage of ELF TLS.
//
// Here we detect what version is being requested, defaulting to 10.7. ELF
// TLS is flagged as enabled if it looks to be supported.
let deployment_target = env::var("MACOSX_DEPLOYMENT_TARGET").ok();
let version = deployment_target.as_ref().and_then(|s| {
let mut i = s.splitn(2, '.');
i.next().and_then(|a| i.next().map(|b| (a, b)))
}).and_then(|(a, b)| {
a.parse::<u32>().and_then(|a| b.parse::<u32>().map(|b| (a, b))).ok()
}).unwrap_or((10, 7));
TargetOptions {
// macOS has -dead_strip, which doesn't rely on function_sections
function_sections: false,
dynamic_linking: true,
executables: true,
target_family: Some("unix".to_string()),
is_like_osx: true,
has_rpath: true,
dll_prefix: "lib".to_string(),
dll_suffix: ".dylib".to_string(),
archive_format: "bsd".to_string(),
pre_link_args: LinkArgs::new(),
has_elf_tls: version >= (10, 7),
abi_return_struct_as_int: true,
emit_debug_gdb_scripts: false,
.. Default::default()
}
}