| 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 version = macos_deployment_target(); |
| |
| 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() |
| } |
| } |
| |
| fn macos_deployment_target() -> (u32, u32) { |
| 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() |
| }); |
| |
| version.unwrap_or((10, 7)) |
| } |
| |
| pub fn macos_llvm_target(arch: &str) -> String { |
| let (major, minor) = macos_deployment_target(); |
| format!("{}-apple-macosx{}.{}.0", arch, major, minor) |
| } |