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[perf] Link LLVM statically on Linux x64#158925

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[perf] Link LLVM statically on Linux x64#158925
Kobzol wants to merge 7 commits into
rust-lang:mainfrom
Kobzol:llvm-link-static

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@Kobzol

@Kobzol Kobzol commented Jul 7, 2026 •
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Opening for some perf. experiments.

@rustbot rustbot added A-CI Area: Our Github Actions CI A-testsuite Area: The testsuite used to check the correctness of rustc S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels Jul 7, 2026
@Kobzol Kobzol changed the title [perf] Link LLVM statically [perf] Link LLVM statically on Linux x64 Jul 7, 2026
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@bors try

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Auto merge of #158925 - Kobzol:llvm-link-static, r=<try>
5314ca2 
[perf] Link LLVM statically on Linux x64
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💔 Test for 5314ca2 failed: CI. Failed job:

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rust-bors Bot pushed a commit that referenced this pull request Jul 8, 2026
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Auto merge of #158925 - Kobzol:llvm-link-static, r=<try>
9131240 
[perf] Link LLVM statically on Linux x64
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@rustbot rustbot added the A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. label Jul 8, 2026
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💔 Test for 9131240 failed: CI. Failed job:

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rust-bors Bot pushed a commit that referenced this pull request Jul 8, 2026
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Auto merge of #158925 - Kobzol:llvm-link-static, r=<try>
b7c4dd5 
[perf] Link LLVM statically on Linux x64
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💔 Test for b7c4dd5 failed: CI. Failed job:

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rust-bors Bot pushed a commit that referenced this pull request Jul 9, 2026
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Auto merge of #158925 - Kobzol:llvm-link-static, r=<try>
9f43143 
[perf] Link LLVM statically on Linux x64
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☀️ Try build successful (CI)
Build commit: 9f43143 (9f431435fd57b42271564c28778407b82c7f1459)
Base parent: 3664b37 (3664b37017c529cad0f0ed259769f15743c21a6a)

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@rust-timer build 9f43143

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Finished benchmarking commit (9f43143): comparison URL.

Overall result: ❌ regressions - BENCHMARK(S) FAILED

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

❗ ❗ ❗ ❗ ❗
Warning ⚠️: The following benchmark(s) failed to build:

  • rustc
  • Job failure

❗ ❗ ❗ ❗ ❗

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

mean range count
Regressions ❌
(primary)		 7.2% [0.7%, 34.6%] 265
Regressions ❌
(secondary)		 6.2% [0.4%, 53.9%] 312
Improvements ✅
(primary)		 -0.8% [-0.8%, -0.8%] 1
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 7.1% [-0.8%, 34.6%] 266

Max RSS (memory usage)

Results (primary -3.5%, secondary -5.7%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 8.1% [4.0%, 10.4%] 3
Regressions ❌
(secondary)		 8.4% [5.6%, 11.1%] 2
Improvements ✅
(primary)		 -3.6% [-11.7%, -0.6%] 215
Improvements ✅
(secondary)		 -5.7% [-12.1%, -0.5%] 304
All ❌✅ (primary) -3.5% [-11.7%, 10.4%] 218

Cycles

Results (primary 11.1%, secondary 9.7%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 11.1% [2.1%, 18.9%] 74
Regressions ❌
(secondary)		 12.5% [1.4%, 47.9%] 75
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -6.5% [-14.6%, -2.5%] 13
All ❌✅ (primary) 11.1% [2.1%, 18.9%] 74

Binary size

Results (primary 0.1%, secondary 0.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 0.1% [0.0%, 0.1%] 59
Regressions ❌
(secondary)		 0.1% [0.0%, 0.1%] 22
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 0.1% [0.0%, 0.1%] 59

Bootstrap: missing data
Artifact size: 388.37 MiB -> 517.59 MiB (33.27%)

@rustbot rustbot added the perf-regression Performance regression. label Jul 9, 2026
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Kobzol commented Jul 10, 2026

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@bors try @rust-timer

Static LLVM linking + cross-language LTO + no opt-dist.

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rust-bors Bot pushed a commit that referenced this pull request Jul 10, 2026
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Auto merge of #158925 - Kobzol:llvm-link-static, r=<try>
b27ae07 
[perf] Link LLVM statically on Linux x64
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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 10, 2026
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💔 Test for b27ae07 failed: CI. Failed job:

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rust-bors Bot pushed a commit that referenced this pull request Jul 10, 2026
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Auto merge of #158925 - Kobzol:llvm-link-static, r=<try>
13ddabc 
[perf] Link LLVM statically on Linux x64
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The job x86_64-gnu-miri failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot) 

Caused by:
  process didn't exit successfully: `/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/release/build/rustc_llvm/b503b30a8dc3b33c/out/build_script_build` (exit status: 101)
  --- stdout
  cargo:rustc-check-cfg=cfg(llvm_component,values("ipo"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("bitreader"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("bitwriter"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("linker"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("asmparser"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("lto"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("coverage"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("instrumentation"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("x86"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("arm"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("aarch64"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("amdgpu"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("avr"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("loongarch"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("m68k"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("csky"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("mips"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("powerpc"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("systemz"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("webassembly"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("msp430"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("sparc"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("nvptx"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("hexagon"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("riscv"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("xtensa"))
  cargo:rustc-check-cfg=cfg(llvm_component,values("bpf"))
  cargo:rerun-if-env-changed=RUST_CHECK
  cargo:rerun-if-env-changed=REAL_LIBRARY_PATH_VAR
  cargo:rerun-if-env-changed=REAL_LIBRARY_PATH
  cargo:rerun-if-env-changed=LLVM_CONFIG
  cargo:rerun-if-changed=/checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/bin/llvm-config
  cargo:rustc-cfg=llvm_component="aarch64"
  cargo:rustc-cfg=llvm_component="amdgpu"
  cargo:rustc-cfg=llvm_component="arm"
  cargo:rustc-cfg=llvm_component="asmparser"
  cargo:rustc-cfg=llvm_component="avr"
  cargo:rustc-cfg=llvm_component="bitreader"
  cargo:rustc-cfg=llvm_component="bitwriter"
  cargo:rustc-cfg=llvm_component="bpf"
  cargo:rustc-cfg=llvm_component="coverage"
  cargo:rustc-cfg=llvm_component="csky"
  cargo:rustc-cfg=llvm_component="hexagon"
  cargo:rustc-cfg=llvm_component="instrumentation"
  cargo:rustc-cfg=llvm_component="ipo"
  cargo:rustc-cfg=llvm_component="linker"
  cargo:rustc-cfg=llvm_component="loongarch"
  cargo:rustc-cfg=llvm_component="lto"
  cargo:rustc-cfg=llvm_component="m68k"
  cargo:rustc-cfg=llvm_component="mips"
  cargo:rustc-cfg=llvm_component="msp430"
  cargo:rustc-cfg=llvm_component="nvptx"
  cargo:rustc-cfg=llvm_component="powerpc"
  cargo:rustc-cfg=llvm_component="riscv"
  cargo:rustc-cfg=llvm_component="sparc"
  cargo:rustc-cfg=llvm_component="systemz"
  cargo:rustc-cfg=llvm_component="webassembly"
  cargo:rustc-cfg=llvm_component="x86"
  cargo:rustc-cfg=llvm_component="xtensa"
  cargo:rerun-if-env-changed=RUSTC_DEBUGINFO_MAP
  cargo:rerun-if-env-changed=LLVM_ENZYME
  cargo:rerun-if-env-changed=LLVM_OFFLOAD
  cargo:rerun-if-env-changed=LLVM_RUSTLLVM
  cargo:rerun-if-env-changed=LLVM_ASSERTIONS
  cargo:rerun-if-changed=llvm-wrapper/CoverageMappingWrapper.cpp
  cargo:rerun-if-changed=llvm-wrapper/.editorconfig
  cargo:rerun-if-changed=llvm-wrapper/SuppressLLVMWarnings.h
  cargo:rerun-if-changed=llvm-wrapper/SymbolWrapper.cpp
  cargo:rerun-if-changed=llvm-wrapper/README
  cargo:rerun-if-changed=llvm-wrapper/RustWrapper.cpp
  cargo:rerun-if-changed=llvm-wrapper/PassWrapper.cpp
  cargo:rerun-if-changed=llvm-wrapper/Linker.cpp
  cargo:rerun-if-changed=llvm-wrapper/LLVMWrapper.h
  OUT_DIR = Some(/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/rustc_llvm/576eca8a01af2ef4/out)
  OPT_LEVEL = Some(3)
  TARGET = Some(x86_64-unknown-linux-gnu)
  HOST = Some(x86_64-unknown-linux-gnu)
  cargo:rerun-if-env-changed=CXX_x86_64-unknown-linux-gnu
  CXX_x86_64-unknown-linux-gnu = None
  cargo:rerun-if-env-changed=CXX_x86_64_unknown_linux_gnu
  CXX_x86_64_unknown_linux_gnu = Some(sccache c++)
  cargo:rerun-if-env-changed=CC_KNOWN_WRAPPER_CUSTOM
  CC_KNOWN_WRAPPER_CUSTOM = None
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some(false)
  CARGO_CFG_TARGET_FEATURE = Some(fxsr,sse,sse2,x87)
  cargo:rerun-if-env-changed=CXXFLAGS
  CXXFLAGS = None
  cargo:rerun-if-env-changed=HOST_CXXFLAGS
  HOST_CXXFLAGS = None
  cargo:rerun-if-env-changed=CXXFLAGS_x86_64_unknown_linux_gnu
  CXXFLAGS_x86_64_unknown_linux_gnu = Some()
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=CXXFLAGS_x86_64-unknown-linux-gnu
  CXXFLAGS_x86_64-unknown-linux-gnu = None
  CARGO_ENCODED_RUSTFLAGS = Some(--cfg=windows_raw_dylib-Csymbol-mangling-version=v0-Zunstable-options--check-cfg=cfg(bootstrap)-Zmacro-backtrace-Csplit-debuginfo=off-Clink-args=-Wl,-z,origin-Clink-args=-Wl,-rpath,$ORIGIN/../lib-Alinker-messages-Zon-broken-pipe=kill--cfg=bootstrap)
  cargo:rerun-if-env-changed=AR_x86_64-unknown-linux-gnu
  AR_x86_64-unknown-linux-gnu = None
  cargo:rerun-if-env-changed=AR_x86_64_unknown_linux_gnu
  AR_x86_64_unknown_linux_gnu = Some(ar)
  RUSTC_WRAPPER = Some(sccache)
  cargo:rerun-if-env-changed=ARFLAGS
  ARFLAGS = None
  cargo:rerun-if-env-changed=HOST_ARFLAGS
  HOST_ARFLAGS = None
  cargo:rerun-if-env-changed=ARFLAGS_x86_64_unknown_linux_gnu
  ARFLAGS_x86_64_unknown_linux_gnu = None
  cargo:rerun-if-env-changed=ARFLAGS_x86_64-unknown-linux-gnu
  ARFLAGS_x86_64-unknown-linux-gnu = None
  cargo:rustc-link-lib=static=llvm-wrapper
  cargo:rustc-link-search=native=/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/rustc_llvm/576eca8a01af2ef4/out

  --- stderr
  llvm-config: error: missing: /checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/lib/libLLVMDemangle.a
  llvm-config: error: missing: /checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/lib/libLLVMSupport.a
  llvm-config: error: missing: /checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/lib/libLLVMTargetParser.a
---
  llvm-config: error: missing: /checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/lib/libLLVMXtensaAsmParser.a
  llvm-config: error: missing: /checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/lib/libLLVMXtensaDisassembler.a

  thread 'main' (6631) panicked at compiler/rustc_llvm/build.rs:191:43:
  command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/bin/llvm-config" "--link-static" "--libs" "--system-libs" "aarch64" "amdgpu" "arm" "asmparser" "avr" "bitreader" "bitwriter" "bpf" "coverage" "csky" "hexagon" "instrumentation" "ipo" "linker" "loongarch" "lto" "m68k" "mips" "msp430" "nvptx" "powerpc" "riscv" "sparc" "systemz" "webassembly" "x86" "xtensa" "--quote-paths"
  expected success, got: exit status: 1
  stack backtrace:
     0: __rustc::rust_begin_unwind
               at /rustc/0417c25868d6dfbd1c291dfeae950504faa6f790/library/std/src/panicking.rs:689:5
     1: core::panicking::panic_fmt

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☀️ Try build successful (CI)
Build commit: 13ddabc (13ddabc8a0c2c571127a3c346eb76d10976a9978)
Base parent: 31e4b84 (31e4b8481fec5ae856d786ff3b75a5bccaf33725)

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Finished benchmarking commit (13ddabc): comparison URL.

Overall result: ❌ regressions - BENCHMARK(S) FAILED

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

❗ ❗ ❗ ❗ ❗
Warning ⚠️: The following benchmark(s) failed to build:

  • rustc
  • Job failure

❗ ❗ ❗ ❗ ❗

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

mean range count
Regressions ❌
(primary)		 24.6% [2.8%, 39.8%] 269
Regressions ❌
(secondary)		 24.1% [4.0%, 62.9%] 327
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 24.6% [2.8%, 39.8%] 269

Max RSS (memory usage)

Results (primary 11.8%, secondary 19.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 11.8% [2.0%, 43.0%] 255
Regressions ❌
(secondary)		 19.0% [2.4%, 47.4%] 325
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 11.8% [2.0%, 43.0%] 255

Cycles

Results (primary 23.0%, secondary 24.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 23.0% [6.5%, 44.2%] 269
Regressions ❌
(secondary)		 24.2% [6.6%, 86.7%] 327
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 23.0% [6.5%, 44.2%] 269

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: missing data
Artifact size: 389.90 MiB -> 428.97 MiB (10.02%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 10, 2026
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☔ The latest upstream changes (presumably #159192) made this pull request unmergeable. Please resolve the merge conflicts by rebasing.

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A-CI Area: Our Github Actions CI A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-testsuite Area: The testsuite used to check the correctness of rustc perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue.

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@Kobzol @rust-log-analyzer @rust-timer @rustbot