1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
use std::{borrow::Cow, env};
use crate::spec::{cvs, FramePointer, LldFlavor, SplitDebuginfo, TargetOptions};
pub fn opts(os: &'static str) -> 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. The architecture
// only matters for default deployment target which is 11.0 for ARM64 and
// 10.7 for everything else.
let has_thread_local = macos_deployment_target("x86_64") >= (10, 7);
TargetOptions {
os: os.into(),
vendor: "apple".into(),
// macOS has -dead_strip, which doesn't rely on function_sections
function_sections: false,
dynamic_linking: true,
linker_is_gnu: false,
families: cvs!["unix"],
is_like_osx: true,
default_dwarf_version: 2,
frame_pointer: FramePointer::Always,
has_rpath: true,
dll_suffix: ".dylib".into(),
archive_format: "darwin".into(),
has_thread_local,
abi_return_struct_as_int: true,
emit_debug_gdb_scripts: false,
eh_frame_header: false,
lld_flavor: LldFlavor::Ld64,
// The historical default for macOS targets is to run `dsymutil` which
// generates a packed version of debuginfo split from the main file.
split_debuginfo: SplitDebuginfo::Packed,
// This environment variable is pretty magical but is intended for
// producing deterministic builds. This was first discovered to be used
// by the `ar` tool as a way to control whether or not mtime entries in
// the archive headers were set to zero or not. It appears that
// eventually the linker got updated to do the same thing and now reads
// this environment variable too in recent versions.
//
// For some more info see the commentary on #47086
link_env: Cow::Borrowed(&[(Cow::Borrowed("ZERO_AR_DATE"), Cow::Borrowed("1"))]),
..Default::default()
}
}
fn deployment_target(var_name: &str) -> Option<(u32, u32)> {
let deployment_target = env::var(var_name).ok();
deployment_target
.as_ref()
.and_then(|s| s.split_once('.'))
.and_then(|(a, b)| a.parse::<u32>().and_then(|a| b.parse::<u32>().map(|b| (a, b))).ok())
}
fn macos_default_deployment_target(arch: &str) -> (u32, u32) {
if arch == "arm64" { (11, 0) } else { (10, 7) }
}
fn macos_deployment_target(arch: &str) -> (u32, u32) {
deployment_target("MACOSX_DEPLOYMENT_TARGET")
.unwrap_or_else(|| macos_default_deployment_target(arch))
}
pub fn macos_llvm_target(arch: &str) -> String {
let (major, minor) = macos_deployment_target(arch);
format!("{}-apple-macosx{}.{}.0", arch, major, minor)
}
pub fn macos_link_env_remove() -> Vec<Cow<'static, str>> {
let mut env_remove = Vec::with_capacity(2);
// Remove the `SDKROOT` environment variable if it's clearly set for the wrong platform, which
// may occur when we're linking a custom build script while targeting iOS for example.
if let Ok(sdkroot) = env::var("SDKROOT") {
if sdkroot.contains("iPhoneOS.platform") || sdkroot.contains("iPhoneSimulator.platform") {
env_remove.push("SDKROOT".into())
}
}
// Additionally, `IPHONEOS_DEPLOYMENT_TARGET` must not be set when using the Xcode linker at
// "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld",
// although this is apparently ignored when using the linker at "/usr/bin/ld".
env_remove.push("IPHONEOS_DEPLOYMENT_TARGET".into());
env_remove
}
fn ios_deployment_target() -> (u32, u32) {
deployment_target("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or((7, 0))
}
pub fn ios_llvm_target(arch: &str) -> String {
// Modern iOS tooling extracts information about deployment target
// from LC_BUILD_VERSION. This load command will only be emitted when
// we build with a version specific `llvm_target`, with the version
// set high enough. Luckily one LC_BUILD_VERSION is enough, for Xcode
// to pick it up (since std and core are still built with the fallback
// of version 7.0 and hence emit the old LC_IPHONE_MIN_VERSION).
let (major, minor) = ios_deployment_target();
format!("{}-apple-ios{}.{}.0", arch, major, minor)
}
pub fn ios_lld_platform_version() -> String {
let (major, minor) = ios_deployment_target();
format!("{}.{}", major, minor)
}
pub fn ios_sim_llvm_target(arch: &str) -> String {
let (major, minor) = ios_deployment_target();
format!("{}-apple-ios{}.{}.0-simulator", arch, major, minor)
}
fn tvos_deployment_target() -> (u32, u32) {
deployment_target("TVOS_DEPLOYMENT_TARGET").unwrap_or((7, 0))
}
pub fn tvos_lld_platform_version() -> String {
let (major, minor) = tvos_deployment_target();
format!("{}.{}", major, minor)
}
fn watchos_deployment_target() -> (u32, u32) {
deployment_target("WATCHOS_DEPLOYMENT_TARGET").unwrap_or((5, 0))
}
pub fn watchos_lld_platform_version() -> String {
let (major, minor) = watchos_deployment_target();
format!("{}.{}", major, minor)
}
pub fn watchos_sim_llvm_target(arch: &str) -> String {
let (major, minor) = watchos_deployment_target();
format!("{}-apple-watchos{}.{}.0-simulator", arch, major, minor)
}
|
