Linking to private symbols from frameworks between compilation units #91372
Closed
Description
This used to work on Rust nightly-2021-11-24:
// Cargo.toml
[package]
name = "foo"
version = "0.1.0"
edition = "2021"
// lib.rs
#[link(name = "AppKit", kind = "framework")]
extern "C" {}
// main.rs
use foo as _;
#[link(name = "CoreGraphics", kind = "framework")]
extern "C" {}
extern "C" {
fn CGDisplayCreateUUIDFromDisplayID(display: u32) -> *const std::os::raw::c_void;
}
fn main() {
unsafe { CGDisplayCreateUUIDFromDisplayID(0) };
}CGDisplayCreateUUIDFromDisplayID is present in the ColorSync framework (on macOS +10.13; on lower versions, in the CoreGraphics framework). The AppKit framework uses ColorSync internally, so the symbol is available through that (I think).
Linking like this worked previously, but since Rust nightly-2021-11-26 it started failing.
This is affecting winit's CI.
Meta
OS: macOS Mojave 10.14.6.
rustc --version --verbose:
rustc 1.58.0-nightly (dd549dcab 2021-11-25)
binary: rustc
commit-hash: dd549dcab404ec4c7d07b5a83aca5bdd7171138f
commit-date: 2021-11-25
host: x86_64-apple-darwin
release: 1.58.0-nightly
LLVM version: 13.0.0
Backtrace
Compiling link_error v0.1.0 (./link_error)
error: linking with `cc` failed: exit status: 1
|
= note: "cc" "-m64" "-arch" "x86_64" "./link_error/target/debug/deps/link_error-df545b853490a663.1684psdcp1c8t8w.rcgu.o" "./link_error/target/debug/deps/link_error-df545b853490a663.3mg4gkj495esxxn3.rcgu.o" "./link_error/target/debug/deps/link_error-df545b853490a663.4lqpqqd6m4wsa5ac.rcgu.o" "./link_error/target/debug/deps/link_error-df545b853490a663.4q6v301re75li0ws.rcgu.o" "./link_error/target/debug/deps/link_error-df545b853490a663.4spajtpt70opf5uj.rcgu.o" "./link_error/target/debug/deps/link_error-df545b853490a663.5gpk52ejgwv2r4xx.rcgu.o" "./link_error/target/debug/deps/link_error-df545b853490a663.rk5agyyp0moj2ik.rcgu.o" "./link_error/target/debug/deps/link_error-df545b853490a663.aueco4pi09j3onj.rcgu.o" "-L" "./link_error/target/debug/deps" "-L" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "-framework" "CoreGraphics" "./link_error/target/debug/deps/liblink_error-9c8bbc70359362ee.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libstd-12c85425d8bdabd2.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libpanic_unwind-c69df909f9b81081.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libobject-f0c16355db7307b7.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libmemchr-d69ae56aea540e36.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libaddr2line-3fd4756c45c77fb7.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libgimli-1d2aab3cb0cd976a.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libstd_detect-1491074c150e2040.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_demangle-5a7d603578c76924.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libhashbrown-a5bcb345953a0f7b.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_alloc-3ffc0cbe23a29292.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libunwind-ee442041a1b0c90d.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcfg_if-e0c705be41bf34ff.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liblibc-23f0461cd27b5763.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc-7db0f39aca3e5046.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_core-7454d006639b0b9c.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcore-07b1a016408f5808.rlib" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcompiler_builtins-852eb1ab762cbb0b.rlib" "-framework" "AppKit" "-lSystem" "-lresolv" "-lc" "-lm" "-liconv" "-L" "~/.rustup/toolchains/nightly-2021-11-26-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "-o" "./link_error/target/debug/deps/link_error-df545b853490a663" "-Wl,-dead_strip" "-nodefaultlibs"
= note: Undefined symbols for architecture x86_64:
"_CGDisplayCreateUUIDFromDisplayID", referenced from:
link_error::main::h68dbd3e6b69f3cec in link_error-df545b853490a663.5gpk52ejgwv2r4xx.rcgu.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: could not compile `link_error` due to previous error