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Bump bootstrap to 1.99.0-beta.1 - #161325

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Bump bootstrap to 1.99.0-beta.1#161325
cuviper wants to merge 6 commits into
rust-lang:mainfrom
cuviper:bump-stage0

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@cuviper cuviper commented Aug 18, 2026

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rustbot commented Aug 18, 2026

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miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

Some changes occurred in std_detect

cc @Amanieu, @folkertdev, @sayantn

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

rustc_codegen_gcc is developed in its own repository. If possible, consider making this change to rust-lang/rustc_codegen_gcc instead.

cc @antoyo, @GuillaumeGomez

@rustbot rustbot added O-unix Operating system: Unix-like S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. T-release Relevant to the release subteam, which will review and decide on the PR/issue. labels Aug 18, 2026
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rustbot commented Aug 18, 2026

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r? @Mark-Simulacrum

rustbot has assigned @Mark-Simulacrum.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

  • Owners of files modified in this PR: @ChrisDenton, libs
  • @ChrisDenton, libs expanded to 13 candidates
  • Random selection from ChrisDenton, JohnTitor, Mark-Simulacrum, clarfonthey, nia-e

@jnkel jnkel mentioned this pull request Aug 19, 2026
Merged
jhpratt added a commit to jhpratt/rust that referenced this pull request Aug 19, 2026
@jhpratt
Rollup merge of rust-lang#161335 - jnkel:fix-query-compiler-libs, r=j…
41025d7 
…ieyouxu

[compiletest] Use the correct rustc lib directory for query_rustc_output

ui-fulldeps tests are built with the stage0 compiler, but invoke the stage1 compiler to determine target features. This caused segfaults on my machine, as the stage1 compiler (which uses LLVM 23) was run with the stage0 lib directory (which has LLVM 22):

```
Testing stage0 with compiletest suite=ui-fulldeps mode=ui (aarch64-apple-darwin)
FATAL: failed to run DYLD_LIBRARY_PATH="/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib:/Users/keljonathan/code/rust/build/aarch64-apple-darwin/bootstrap-tools/aarch64-apple-darwin/release/build/run_make_support/1bb3eeb38bc010bc/out" RUSTC_BOOTSTRAP="1" "/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage1/bin/rustc" "-Crpath" "-Cdebuginfo=0" "-Alinker_messages" "--print=all-target-specs-json" "-Zunstable-options"
--- stdout

--- stderr
error: rustc interrupted by SIGSEGV, printing backtrace
```

<details><summary>Backtrace</summary>
<p>

```
0   librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x0000000184c7d744 _sigtramp + 56
2   libLLVM.dylib                       0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40
3   librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104
4   librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880
5   librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344
6   librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68
7   librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148
8   librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68
9   librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48
10  librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112
11  librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168
12  librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112
13  librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208
14  librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392
15  libsystem_pthread.dylib             0x0000000184c73c58 _pthread_start + 136
16  libsystem_pthread.dylib             0x0000000184c6ec1c thread_start + 8

note: we would appreciate a report at https://github.com/rust-lang/rust
help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432

thread 'main' (3571716) panicked at src/tools/compiletest/src/common.rs:1209:9:
fatal error
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5
   1: core::panicking::panic_fmt
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14
   2: query_rustc_output
             at ./src/tools/compiletest/src/diagnostics.rs:14:9
   3: new
             at ./src/tools/compiletest/src/common.rs:925:77
   4: {closure#0}
             at ./src/tools/compiletest/src/common.rs:792:41
   5: {closure#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:50
   6: {closure#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:543:19
   7: {closure#0}<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:40
   8: <std::sys::sync::once::queue::Once>::call
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21
   9: call_once_force<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:20
  10: initialize<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:542:19
  11: get_or_try_init<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:410:14
  12: get_or_init<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:20
  13: target_cfgs
             at ./src/tools/compiletest/src/common.rs:792:26
  14: prepare_conditions
             at ./src/tools/compiletest/src/directives/cfg.rs:121:23
  15: load
             at ./src/tools/compiletest/src/directives.rs:50:29
  16: collect_and_make_tests
             at ./src/tools/compiletest/src/lib.rs:186:17
  17: run_tests
             at ./src/tools/compiletest/src/lib.rs:103:22
  18: main
             at ./src/tools/compiletest/src/cli.rs:30:5
  19: call_once<fn(), ()>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
```

</p>
</details>

Note that `DYLD_LIBRARY_PATH` contains `rust/build/aarch64-apple-darwin/stage0/lib`, while the compiler we're executing is `rust/build/aarch64-apple-darwin/stage1/bin/rustc`.

This PR fixes the issue by providing compiletest with the correct lib directory to use when querying the stage1 compiler.

I expect the problem will go away again once rust-lang#161325 is merged and stage0 and stage1 use the same LLVM version, but this PR ensures it won't be a problem for the next LLVM bump.

I encountered a similar issue building the unstable book, which I am planning to submit a followup PR for.
jhpratt added a commit to jhpratt/rust that referenced this pull request Aug 19, 2026
@jhpratt
Rollup merge of rust-lang#161335 - jnkel:fix-query-compiler-libs, r=j…
2f3f287 
…ieyouxu

[compiletest] Use the correct rustc lib directory for query_rustc_output

ui-fulldeps tests are built with the stage0 compiler, but invoke the stage1 compiler to determine target features. This caused segfaults on my machine, as the stage1 compiler (which uses LLVM 23) was run with the stage0 lib directory (which has LLVM 22):

```
Testing stage0 with compiletest suite=ui-fulldeps mode=ui (aarch64-apple-darwin)
FATAL: failed to run DYLD_LIBRARY_PATH="/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib:/Users/keljonathan/code/rust/build/aarch64-apple-darwin/bootstrap-tools/aarch64-apple-darwin/release/build/run_make_support/1bb3eeb38bc010bc/out" RUSTC_BOOTSTRAP="1" "/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage1/bin/rustc" "-Crpath" "-Cdebuginfo=0" "-Alinker_messages" "--print=all-target-specs-json" "-Zunstable-options"
--- stdout

--- stderr
error: rustc interrupted by SIGSEGV, printing backtrace
```

<details><summary>Backtrace</summary>
<p>

```
0   librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x0000000184c7d744 _sigtramp + 56
2   libLLVM.dylib                       0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40
3   librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104
4   librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880
5   librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344
6   librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68
7   librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148
8   librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68
9   librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48
10  librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112
11  librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168
12  librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112
13  librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208
14  librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392
15  libsystem_pthread.dylib             0x0000000184c73c58 _pthread_start + 136
16  libsystem_pthread.dylib             0x0000000184c6ec1c thread_start + 8

note: we would appreciate a report at https://github.com/rust-lang/rust
help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432

thread 'main' (3571716) panicked at src/tools/compiletest/src/common.rs:1209:9:
fatal error
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5
   1: core::panicking::panic_fmt
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14
   2: query_rustc_output
             at ./src/tools/compiletest/src/diagnostics.rs:14:9
   3: new
             at ./src/tools/compiletest/src/common.rs:925:77
   4: {closure#0}
             at ./src/tools/compiletest/src/common.rs:792:41
   5: {closure#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:50
   6: {closure#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:543:19
   7: {closure#0}<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:40
   8: <std::sys::sync::once::queue::Once>::call
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21
   9: call_once_force<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:20
  10: initialize<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:542:19
  11: get_or_try_init<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:410:14
  12: get_or_init<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:20
  13: target_cfgs
             at ./src/tools/compiletest/src/common.rs:792:26
  14: prepare_conditions
             at ./src/tools/compiletest/src/directives/cfg.rs:121:23
  15: load
             at ./src/tools/compiletest/src/directives.rs:50:29
  16: collect_and_make_tests
             at ./src/tools/compiletest/src/lib.rs:186:17
  17: run_tests
             at ./src/tools/compiletest/src/lib.rs:103:22
  18: main
             at ./src/tools/compiletest/src/cli.rs:30:5
  19: call_once<fn(), ()>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
```

</p>
</details>

Note that `DYLD_LIBRARY_PATH` contains `rust/build/aarch64-apple-darwin/stage0/lib`, while the compiler we're executing is `rust/build/aarch64-apple-darwin/stage1/bin/rustc`.

This PR fixes the issue by providing compiletest with the correct lib directory to use when querying the stage1 compiler.

I expect the problem will go away again once rust-lang#161325 is merged and stage0 and stage1 use the same LLVM version, but this PR ensures it won't be a problem for the next LLVM bump.

I encountered a similar issue building the unstable book, which I am planning to submit a followup PR for.
@rust-bors

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rust-bors Bot pushed a commit that referenced this pull request Aug 19, 2026
@bors
Unrolled build for #161335
bda7334 
Rollup merge of #161335 - jnkel:fix-query-compiler-libs, r=jieyouxu

[compiletest] Use the correct rustc lib directory for query_rustc_output

ui-fulldeps tests are built with the stage0 compiler, but invoke the stage1 compiler to determine target features. This caused segfaults on my machine, as the stage1 compiler (which uses LLVM 23) was run with the stage0 lib directory (which has LLVM 22):

```
Testing stage0 with compiletest suite=ui-fulldeps mode=ui (aarch64-apple-darwin)
FATAL: failed to run DYLD_LIBRARY_PATH="/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib:/Users/keljonathan/code/rust/build/aarch64-apple-darwin/bootstrap-tools/aarch64-apple-darwin/release/build/run_make_support/1bb3eeb38bc010bc/out" RUSTC_BOOTSTRAP="1" "/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage1/bin/rustc" "-Crpath" "-Cdebuginfo=0" "-Alinker_messages" "--print=all-target-specs-json" "-Zunstable-options"
--- stdout

--- stderr
error: rustc interrupted by SIGSEGV, printing backtrace
```

<details><summary>Backtrace</summary>
<p>

```
0   librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x0000000184c7d744 _sigtramp + 56
2   libLLVM.dylib                       0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40
3   librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104
4   librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880
5   librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344
6   librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68
7   librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148
8   librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68
9   librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48
10  librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112
11  librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168
12  librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112
13  librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208
14  librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392
15  libsystem_pthread.dylib             0x0000000184c73c58 _pthread_start + 136
16  libsystem_pthread.dylib             0x0000000184c6ec1c thread_start + 8

note: we would appreciate a report at https://github.com/rust-lang/rust
help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432

thread 'main' (3571716) panicked at src/tools/compiletest/src/common.rs:1209:9:
fatal error
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5
   1: core::panicking::panic_fmt
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14
   2: query_rustc_output
             at ./src/tools/compiletest/src/diagnostics.rs:14:9
   3: new
             at ./src/tools/compiletest/src/common.rs:925:77
   4: {closure#0}
             at ./src/tools/compiletest/src/common.rs:792:41
   5: {closure#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:50
   6: {closure#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:543:19
   7: {closure#0}<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:40
   8: <std::sys::sync::once::queue::Once>::call
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21
   9: call_once_force<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:20
  10: initialize<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:542:19
  11: get_or_try_init<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:410:14
  12: get_or_init<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:20
  13: target_cfgs
             at ./src/tools/compiletest/src/common.rs:792:26
  14: prepare_conditions
             at ./src/tools/compiletest/src/directives/cfg.rs:121:23
  15: load
             at ./src/tools/compiletest/src/directives.rs:50:29
  16: collect_and_make_tests
             at ./src/tools/compiletest/src/lib.rs:186:17
  17: run_tests
             at ./src/tools/compiletest/src/lib.rs:103:22
  18: main
             at ./src/tools/compiletest/src/cli.rs:30:5
  19: call_once<fn(), ()>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
```

</p>
</details>

Note that `DYLD_LIBRARY_PATH` contains `rust/build/aarch64-apple-darwin/stage0/lib`, while the compiler we're executing is `rust/build/aarch64-apple-darwin/stage1/bin/rustc`.

This PR fixes the issue by providing compiletest with the correct lib directory to use when querying the stage1 compiler.

I expect the problem will go away again once #161325 is merged and stage0 and stage1 use the same LLVM version, but this PR ensures it won't be a problem for the next LLVM bump.

I encountered a similar issue building the unstable book, which I am planning to submit a followup PR for.
RalfJung pushed a commit to RalfJung/miri that referenced this pull request Aug 19, 2026
@jhpratt
Rollup merge of #161335 - jnkel:fix-query-compiler-libs, r=jieyouxu
5c8c843 
[compiletest] Use the correct rustc lib directory for query_rustc_output

ui-fulldeps tests are built with the stage0 compiler, but invoke the stage1 compiler to determine target features. This caused segfaults on my machine, as the stage1 compiler (which uses LLVM 23) was run with the stage0 lib directory (which has LLVM 22):

```
Testing stage0 with compiletest suite=ui-fulldeps mode=ui (aarch64-apple-darwin)
FATAL: failed to run DYLD_LIBRARY_PATH="/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib:/Users/keljonathan/code/rust/build/aarch64-apple-darwin/bootstrap-tools/aarch64-apple-darwin/release/build/run_make_support/1bb3eeb38bc010bc/out" RUSTC_BOOTSTRAP="1" "/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage1/bin/rustc" "-Crpath" "-Cdebuginfo=0" "-Alinker_messages" "--print=all-target-specs-json" "-Zunstable-options"
--- stdout

--- stderr
error: rustc interrupted by SIGSEGV, printing backtrace
```

<details><summary>Backtrace</summary>
<p>

```
0   librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x0000000184c7d744 _sigtramp + 56
2   libLLVM.dylib                       0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40
3   librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104
4   librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880
5   librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344
6   librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68
7   librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148
8   librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68
9   librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48
10  librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112
11  librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168
12  librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112
13  librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208
14  librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392
15  libsystem_pthread.dylib             0x0000000184c73c58 _pthread_start + 136
16  libsystem_pthread.dylib             0x0000000184c6ec1c thread_start + 8

note: we would appreciate a report at https://github.com/rust-lang/rust
help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432

thread 'main' (3571716) panicked at src/tools/compiletest/src/common.rs:1209:9:
fatal error
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5
   1: core::panicking::panic_fmt
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14
   2: query_rustc_output
             at ./src/tools/compiletest/src/diagnostics.rs:14:9
   3: new
             at ./src/tools/compiletest/src/common.rs:925:77
   4: {closure#0}
             at ./src/tools/compiletest/src/common.rs:792:41
   5: {closure#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:50
   6: {closure#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:543:19
   7: {closure#0}<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:40
   8: <std::sys::sync::once::queue::Once>::call
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21
   9: call_once_force<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:20
  10: initialize<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:542:19
  11: get_or_try_init<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:410:14
  12: get_or_init<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:20
  13: target_cfgs
             at ./src/tools/compiletest/src/common.rs:792:26
  14: prepare_conditions
             at ./src/tools/compiletest/src/directives/cfg.rs:121:23
  15: load
             at ./src/tools/compiletest/src/directives.rs:50:29
  16: collect_and_make_tests
             at ./src/tools/compiletest/src/lib.rs:186:17
  17: run_tests
             at ./src/tools/compiletest/src/lib.rs:103:22
  18: main
             at ./src/tools/compiletest/src/cli.rs:30:5
  19: call_once<fn(), ()>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
```

</p>
</details>

Note that `DYLD_LIBRARY_PATH` contains `rust/build/aarch64-apple-darwin/stage0/lib`, while the compiler we're executing is `rust/build/aarch64-apple-darwin/stage1/bin/rustc`.

This PR fixes the issue by providing compiletest with the correct lib directory to use when querying the stage1 compiler.

I expect the problem will go away again once rust-lang/rust#161325 is merged and stage0 and stage1 use the same LLVM version, but this PR ensures it won't be a problem for the next LLVM bump.

I encountered a similar issue building the unstable book, which I am planning to submit a followup PR for.
@rustbot

rustbot commented Aug 19, 2026

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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Mark-Simulacrum
Mark-Simulacrum reviewed Aug 20, 2026
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@Mark-Simulacrum Mark-Simulacrum left a comment •
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@bors r+ p=1 (bitrotty)

View changes since this review

@rust-bors

rust-bors Bot commented Aug 20, 2026

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📌 Commit baa2ce0 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 10. This pull request will be tested once the tree is reopened.

Reason for tree closure: Main branch is broken

@rust-bors rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 20, 2026
JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Aug 20, 2026
@JonathanBrouwer
Rollup merge of rust-lang#161325 - cuviper:bump-stage0, r=Mark-Simula…
6c27892 
…crum

Bump bootstrap to 1.99.0-beta.1

https://forge.rust-lang.org/release/process.html#default-branch-bootstrap-update-and-crater-tuesday
@JonathanBrouwer JonathanBrouwer mentioned this pull request Aug 20, 2026
Open
pull Bot pushed a commit to asukaminato0721/rust-analyzer that referenced this pull request Aug 20, 2026
@jhpratt
Rollup merge of #161335 - jnkel:fix-query-compiler-libs, r=jieyouxu
2f455c7 
[compiletest] Use the correct rustc lib directory for query_rustc_output

ui-fulldeps tests are built with the stage0 compiler, but invoke the stage1 compiler to determine target features. This caused segfaults on my machine, as the stage1 compiler (which uses LLVM 23) was run with the stage0 lib directory (which has LLVM 22):

```
Testing stage0 with compiletest suite=ui-fulldeps mode=ui (aarch64-apple-darwin)
FATAL: failed to run DYLD_LIBRARY_PATH="/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage0/lib:/Users/keljonathan/code/rust/build/aarch64-apple-darwin/bootstrap-tools/aarch64-apple-darwin/release/build/run_make_support/1bb3eeb38bc010bc/out" RUSTC_BOOTSTRAP="1" "/Users/keljonathan/code/rust/build/aarch64-apple-darwin/stage1/bin/rustc" "-Crpath" "-Cdebuginfo=0" "-Alinker_messages" "--print=all-target-specs-json" "-Zunstable-options"
--- stdout

--- stderr
error: rustc interrupted by SIGSEGV, printing backtrace
```

<details><summary>Backtrace</summary>
<p>

```
0   librustc_driver-18049a207bb38ba8.dy 0x000000010e09e9b8 _RNvNtCsfNrGi27GPxl_17rustc_driver_impl14signal_handler17print_stack_trace + 140
1   libsystem_platform.dylib            0x0000000184c7d744 _sigtramp + 56
2   libLLVM.dylib                       0x000000011a9e22e0 _ZNK4llvm15MCSubtargetInfo13checkFeaturesENS_9StringRefE + 40
3   librustc_driver-18049a207bb38ba8.dy 0x000000010e44c798 LLVMRustHasFeature + 104
4   librustc_driver-18049a207bb38ba8.dy 0x000000010e3c4e34 _RINvXs0_NtNtNtCsk8HLZXaYIk4_4core4iter8adapters3mapINtB6_3MapINtNtB8_7flatten7FlatMapINtNtB8_6filter6FilterINtNtNtBc_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB28_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB4G_s_0E0EIBO_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB28_ENCNCB3h_s_00ENCB3h_s_0ENCINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB7v_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtBa_6traits7collect6ExtendB8e_E6extendBX_E0ENtNtB9I_8iterator8Iterator4folduNCINvNvBar_8for_each4callTB8e_uENCINvXs1i_NtB7x_3mapINtBbD_7HashMapB8e_uB8V_EIB9E_Bbm_E6extendBN_E0E0EB4K_ + 880
5   librustc_driver-18049a207bb38ba8.dy 0x000000010e2ad884 _RINvXs1i_NtCsdLs5ZkLaCXa_9hashbrown3mapINtB7_7HashMapNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymboluNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendTBP_uEE6extendINtNtNtB2m_8adapters3map3MapINtNtB3r_7flatten7FlatMapINtNtB3r_6filter6FilterINtNtNtB2o_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB52_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7A_s_0E0EIB3n_INtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB52_ENCNCB6b_s_00ENCB6b_s_0ENCINvXs8_NtB9_3setINtBaq_7HashSetBP_B1x_EIB2g_BP_E6extendB3O_E0EEB7E_ + 344
6   librustc_driver-18049a207bb38ba8.dy 0x000000010e2b1ec4 _RINvXs8_NtCsdLs5ZkLaCXa_9hashbrown3setINtB6_7HashSetNtNtCsSGoTcZpb2F_10rustc_span6symbol6SymbolNtCs5ZGGmiYplBm_10rustc_hash13FxBuildHasherEINtNtNtNtCsk8HLZXaYIk4_4core4iter6traits7collect6ExtendBO_E6extendINtNtNtB2k_8adapters7flatten7FlatMapINtNtB3m_6filter6FilterINtNtNtB2m_5slice4iter4IterTReNtNtCs79s86CIooN0_12rustc_target15target_features9StabilityRSB4G_EENCINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB7e_s_0E0EINtNtB3m_3map3MapINtNtNtNtCs99cPMl0y5Ob_3std11collections4hash3set8IntoIterB4G_ENCNCB5P_s_00ENCB5P_s_0EEB7i_ + 68
7   librustc_driver-18049a207bb38ba8.dy 0x000000010e2bfa90 _RINvNtCses5MBT5CPFU_17rustc_codegen_ssa15target_features24internal_target_featuresKj2_NCNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config0NCB1o_s_0EB1s_ + 148
8   librustc_driver-18049a207bb38ba8.dy 0x000000010e2fb918 _RNvNtCsgXm2bqwPj4W_18rustc_codegen_llvm9llvm_util13target_config + 68
9   librustc_driver-18049a207bb38ba8.dy 0x000000010e292fb0 _RNvNtCs6x0lOIkloew_15rustc_interface4util17add_configuration + 48
10  librustc_driver-18049a207bb38ba8.dy 0x000000010e06b204 _RINvMs_Csfkr8sXZt4uY_10scoped_tlsINtB5_9ScopedKeyNtCsSGoTcZpb2F_10rustc_span14SessionGlobalsE3setNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1G_31run_in_thread_pool_with_globalsNCINvNtB1I_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000uEB44_ + 1112
11  librustc_driver-18049a207bb38ba8.dy 0x000000010e090914 _RINvCsSGoTcZpb2F_10rustc_span27create_session_globals_thenuNCNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB14_31run_in_thread_pool_with_globalsNCINvNtB16_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE000EB3s_ + 168
12  librustc_driver-18049a207bb38ba8.dy 0x000000010e07823c _RINvNtNtCs99cPMl0y5Ob_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEB3C_ + 112
13  librustc_driver-18049a207bb38ba8.dy 0x000000010e04efa4 _RNSNvYNCINvNtNtCs99cPMl0y5Ob_3std6thread9lifecycle15spawn_uncheckedNCNCINvNtCs6x0lOIkloew_15rustc_interface4util26run_in_thread_with_globalsNCINvB1a_31run_in_thread_pool_with_globalsNCINvNtB1c_9interface12run_compileruNCNvCsfNrGi27GPxl_17rustc_driver_impl12run_compiler0Es0_0uE0uE00uEs_0INtNtNtCsk8HLZXaYIk4_4core3ops8function6FnOnceuE9call_once6vtableB3y_ + 208
14  librustc_driver-18049a207bb38ba8.dy 0x0000000111697118 _RNvNvMs0_NtNtNtCs99cPMl0y5Ob_3std3sys6thread4unixNtB7_6Thread3new12thread_start + 392
15  libsystem_pthread.dylib             0x0000000184c73c58 _pthread_start + 136
16  libsystem_pthread.dylib             0x0000000184c6ec1c thread_start + 8

note: we would appreciate a report at https://github.com/rust-lang/rust
help: you can increase rustc's stack size by setting RUST_MIN_STACK=33554432

thread 'main' (3571716) panicked at src/tools/compiletest/src/common.rs:1209:9:
fatal error
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/panicking.rs:679:5
   1: core::panicking::panic_fmt
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/panicking.rs:80:14
   2: query_rustc_output
             at ./src/tools/compiletest/src/diagnostics.rs:14:9
   3: new
             at ./src/tools/compiletest/src/common.rs:925:77
   4: {closure#0}
             at ./src/tools/compiletest/src/common.rs:792:41
   5: {closure#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:50
   6: {closure#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:543:19
   7: {closure#0}<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:40
   8: <std::sys::sync::once::queue::Once>::call
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sys/sync/once/queue.rs:225:21
   9: call_once_force<std::sync::once_lock::{impl#0}::initialize::{closure_env#0}<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once.rs:226:20
  10: initialize<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:542:19
  11: get_or_try_init<compiletest::common::TargetCfgs, std::sync::once_lock::{impl#0}::get_or_init::{closure_env#0}<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>, !>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:410:14
  12: get_or_init<compiletest::common::TargetCfgs, compiletest::common::{impl#5}::target_cfgs::{closure_env#0}>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/std/src/sync/once_lock.rs:321:20
  13: target_cfgs
             at ./src/tools/compiletest/src/common.rs:792:26
  14: prepare_conditions
             at ./src/tools/compiletest/src/directives/cfg.rs:121:23
  15: load
             at ./src/tools/compiletest/src/directives.rs:50:29
  16: collect_and_make_tests
             at ./src/tools/compiletest/src/lib.rs:186:17
  17: run_tests
             at ./src/tools/compiletest/src/lib.rs:103:22
  18: main
             at ./src/tools/compiletest/src/cli.rs:30:5
  19: call_once<fn(), ()>
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
```

</p>
</details>

Note that `DYLD_LIBRARY_PATH` contains `rust/build/aarch64-apple-darwin/stage0/lib`, while the compiler we're executing is `rust/build/aarch64-apple-darwin/stage1/bin/rustc`.

This PR fixes the issue by providing compiletest with the correct lib directory to use when querying the stage1 compiler.

I expect the problem will go away again once rust-lang/rust#161325 is merged and stage0 and stage1 use the same LLVM version, but this PR ensures it won't be a problem for the next LLVM bump.

I encountered a similar issue building the unstable book, which I am planning to submit a followup PR for.
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