build broken, rustc_driver fails to link (with llvm?)

[matthiaskrgr]

The repo is at 51748a8
I'm using clang 11.1.0 and sccache to build.
I already tried a clean rebuild (of llvm+rustc) but that didn't help.
I can try to do a sccache-less build next but I'm not sure if it will make a difference.

   Compiling rustc_driver v0.0.0 (/home/matthias/vcs/github/rust/compiler/rustc_driver)
error: linking with `cc` failed: exit code: 1
...

  = note: /usr/bin/ld: /home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/llvm/build/lib/libLLVM-12-rust-dev.so: __morestack: invalid needed version 2
          /usr/bin/ld: /home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/llvm/build/lib/libLLVM-12-rust-dev.so: error adding symbols: bad value
          collect2: error: ld returned 1 exit status


error: aborting due to previous error

error: could not compile `rustc_driver`

To learn more, run the command again with --verbose.
command did not execute successfully: "/home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "x86_64-unknown-linux-gnu" "-Zbinary-dep-depinfo" "-j" "4" "--release" "--features" " llvm max_level_info" "--manifest-path" "/home/matthias/vcs/github/rust/compiler/rustc/Cargo.toml" "--message-format" "json-render-diagnostics"
expected success, got: exit code: 101
failed to run: /home/matthias/vcs/github/rust/build/bootstrap/debug/bootstrap build
Build completed unsuccessfully in 0:01:36

Backtrace

Updating only changed submodules
Submodules updated in 0.06 seconds
    Finished dev [unoptimized + debuginfo] target(s) in 0.30s
Building stage0 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
    Finished release [optimized] target(s) in 0.31s
Copying stage0 std from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage0 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling rustc_driver v0.0.0 (/home/matthias/vcs/github/rust/compiler/rustc_driver)
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc_driver-8a4e692bfe6731a9.rustc_driver.118v6stn-cgu.0.rcgu.o" "/home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc_driver-8a4e692bfe6731a9.rustc_driver.118v6stn-cgu.1.rcgu.o" "/home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc_driver-8a4e692bfe6731a9.rustc_driver.118v6stn-cgu.2.rcgu.o" "/home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc_driver-8a4e692bfe6731a9.rustc_driver.118v6stn-cgu.3.rcgu.o" "-o" 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  = note: /usr/bin/ld: /home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/llvm/build/lib/libLLVM-12-rust-dev.so: __morestack: invalid needed version 2
          /usr/bin/ld: /home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/llvm/build/lib/libLLVM-12-rust-dev.so: error adding symbols: bad value
          collect2: error: ld returned 1 exit status


error: aborting due to previous error

error: could not compile `rustc_driver`

To learn more, run the command again with --verbose.
command did not execute successfully: "/home/matthias/vcs/github/rust/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "x86_64-unknown-linux-gnu" "-Zbinary-dep-depinfo" "-j" "4" "--release" "--features" " llvm max_level_info" "--manifest-path" "/home/matthias/vcs/github/rust/compiler/rustc/Cargo.toml" "--message-format" "json-render-diagnostics"
expected success, got: exit code: 101
failed to run: /home/matthias/vcs/github/rust/build/bootstrap/debug/bootstrap build
Build completed unsuccessfully in 0:01:36

[nikic]

I believe the current known workarounds for this are 1. use gcc or clang 10 or older, or 2. use lld for linking.

[matthiaskrgr]

Can confirm that using lld "fixes" this.

[aaronpuchert]

Seems to me like an issue in lld. I've opened bug 49915 for this.

[aaronpuchert]

Just for reference, here is the proposed fix: https://reviews.llvm.org/D100624.

[aaronpuchert]

The bug has been fixed, the fix will be in LLVM 12.0.1.

[jyn514]

@matthiaskrgr are you still hitting this now that LLVM 12 is merged?

[Mark-Simulacrum]

Going to go ahead and close as fixed -- we're now requiring LLVM 12+ to build rustc.