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Changes required for rustc/cargo to build for iOS targets #73903

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e191358
Changes required for rustc/cargo to build for iOS targets
Jun 30, 2020
c22bcb0
Only set the flag in LLVM builds.
Jun 30, 2020
5f3dbd8
Don't break on iOS Simulator builds.
Jun 30, 2020
4fd1c77
Document the CMake defines.
Jul 1, 2020
22e8ced
Also document iphoneos-version-min.
Jul 1, 2020
67b162f
Explicitly check for iOS/tvOS.
Jul 1, 2020
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19 changes: 19 additions & 0 deletions src/bootstrap/native.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -175,6 +175,17 @@ impl Step for Llvm {
cfg.define("LLVM_ENABLE_ZLIB", "OFF");
}

// Are we compiling for iOS/tvOS?
if target.contains("apple-ios") || target.contains("apple-tvos") {
// These two defines prevent CMake from automatically trying to add a MacOSX sysroot, which leads to a compiler error.
cfg.define("CMAKE_OSX_SYSROOT", "/");
cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
// Prevent cmake from adding -bundle to CFLAGS automatically, which leads to a compiler error because "-bitcode_bundle" also gets added.
cfg.define("LLVM_ENABLE_PLUGINS", "OFF");
// Zlib fails to link properly, leading to a compiler error.
cfg.define("LLVM_ENABLE_ZLIB", "OFF");
}

if builder.config.llvm_thin_lto {
cfg.define("LLVM_ENABLE_LTO", "Thin");
if !target.contains("apple") {
Expand Down Expand Up @@ -412,6 +423,14 @@ fn configure_cmake(
if let Some(ref s) = builder.config.llvm_cflags {
cflags.push_str(&format!(" {}", s));
}
// Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
if target.contains("apple-ios") {
if target.contains("86-") {
cflags.push_str(" -miphonesimulator-version-min=10.0");
} else {
cflags.push_str(" -miphoneos-version-min=10.0");
}
}
cfg.define("CMAKE_C_FLAGS", cflags);
let mut cxxflags = builder.cflags(target, GitRepo::Llvm).join(" ");
if builder.config.llvm_static_stdcpp && !target.contains("msvc") && !target.contains("netbsd") {
Expand Down