aws-lc-sys fails to build by clang on Windows when installing cargo-audit

[AngelicosPhosphoros]

Problem:

I use clang as C, C++ compiler, lllvm-ar as archiver and rust-lld as linker when installing cargo binaries. That allows crosslanguage LTO.

However, in such setup, the aws-lc-sys crate doesn't compile on Windows and breaks installation of cargo-audit. It had successfully installed before inclusion of this crate (I don't remember version though and I had already deleted old one).

Relevant details

LLVM and rustc versions:

> rustc --version --verbose
rustc 1.95.0 (59807616e 2026-04-14)
binary: rustc
commit-hash: 59807616e1fa2540724bfbac14d7976d7e4a3860
commit-date: 2026-04-14
host: x86_64-pc-windows-msvc
release: 1.95.0
LLVM version: 22.1.2
> clang --version
clang version 22.1.6 (https://github.com/llvm/llvm-project fc4aad7b5db3fff421df9a9637605b9ca5667881)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\LLVM\bin

OS version:

Get-ComputerInfo | Select-Object WindowsProductName, OsVersion, OsBuildNumber

WindowsProductName    OsVersion  OsBuildNumber
------------------    ---------  -------------
Windows 10 Enterprise 10.0.19041 19041

Command used to build using Clang + Rustc LTO;

$env:CC='clang'
$env:CXX='clang++'
$env:CFLAGS='-flto=thin -march=native'
$env:CXXFLAGS='-flto=thin -march=native'
$env:AR='llvm-lib'
$env:RUSTFLAGS=' -Ctarget-cpu=native -Ccodegen-units=1 '
$env:CARGO_PROFILE_RELEASE_LTO='thin'
$env:CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER='rust-lld'
cargo install --locked --target=x86_64-pc-windows-msvc cargo-audit

Build log:

Error message (huge)

    Updating crates.io index
  Installing cargo-audit v0.22.1
    Updating crates.io index
    Updating crates.io index
   Compiling proc-macro2 v1.0.106
   Compiling unicode-ident v1.0.22
   Compiling quote v1.0.44
   Compiling memchr v2.7.6
   Compiling windows-link v0.2.1
   Compiling cfg-if v1.0.4
   Compiling regex-syntax v0.8.9
   Compiling windows_x86_64_msvc v0.52.6
   Compiling smallvec v1.15.1
   Compiling once_cell v1.21.3
   Compiling bytes v1.11.1
   Compiling thiserror v2.0.18
   Compiling stable_deref_trait v1.2.1
   Compiling crossbeam-utils v0.8.21
   Compiling crc32fast v1.5.0
   Compiling tinyvec_macros v0.1.1
   Compiling gix-trace v0.1.17
   Compiling fastrand v2.3.0
   Compiling itoa v1.0.17
   Compiling parking_lot_core v0.9.12
   Compiling scopeguard v1.2.0
   Compiling zlib-rs v0.5.5
   Compiling typenum v1.19.0
   Compiling equivalent v1.0.2
   Compiling tinyvec v1.10.0
   Compiling lock_api v0.4.14
   Compiling allocator-api2 v0.2.21
   Compiling version_check v0.9.5
   Compiling foldhash v0.2.0
   Compiling bitflags v2.10.0
   Compiling byteorder v1.5.0
   Compiling heapless v0.8.0
   Compiling hash32 v0.3.1
   Compiling windows_x86_64_msvc v0.53.1
   Compiling cpufeatures v0.2.17
   Compiling aho-corasick v1.1.4
   Compiling jiff-tzdb v0.1.5
   Compiling serde_core v1.0.228
   Compiling winnow v0.7.14
   Compiling windows-sys v0.61.2
   Compiling getrandom v0.3.4
   Compiling generic-array v0.14.7
   Compiling jiff-tzdb-platform v0.1.3
   Compiling unicode-normalization v0.1.25
   Compiling hashbrown v0.16.1
   Compiling pin-project-lite v0.2.16
   Compiling shlex v1.3.0
   Compiling find-msvc-tools v0.1.9
   Compiling memmap2 v0.9.9
   Compiling futures-core v0.3.31
   Compiling fs_extra v1.3.0
   Compiling dunce v1.0.5
   Compiling gix-utils v0.3.1
   Compiling serde v1.0.228
   Compiling zeroize v1.8.2
   Compiling futures-sink v0.3.31
   Compiling windows-targets v0.52.6
   Compiling windows-targets v0.53.5
   Compiling tracing-core v0.1.36
   Compiling windows-sys v0.52.0
   Compiling litemap v0.8.1
   Compiling windows-sys v0.60.2
   Compiling jobserver v0.1.34
   Compiling aws-lc-rs v1.15.4
   Compiling percent-encoding v2.3.2
   Compiling writeable v0.6.2
   Compiling http v1.4.0
   Compiling parking_lot v0.12.5
   Compiling fnv v1.0.7
   Compiling icu_properties_data v2.1.2
   Compiling icu_normalizer_data v2.1.1
   Compiling slab v0.4.12
   Compiling cc v1.2.55
   Compiling indexmap v2.13.0
   Compiling adler2 v2.0.1
   Compiling simd-adler32 v0.3.8
   Compiling pin-utils v0.1.0
   Compiling prodash v31.0.0
   Compiling rustls-pki-types v1.14.0
   Compiling rustls v0.23.36
   Compiling crossbeam-channel v0.5.15
   Compiling futures-io v0.3.31
   Compiling faster-hex v0.10.0
   Compiling regex-automata v0.4.14
   Compiling miniz_oxide v0.8.9
   Compiling syn v2.0.114
   Compiling httparse v1.10.1
   Compiling futures-task v0.3.31
   Compiling untrusted v0.9.0
   Compiling try-lock v0.2.5
   Compiling unicode-bom v2.0.3
   Compiling log v0.4.29
   Compiling atomic-waker v1.1.2
   Compiling tower-service v0.3.3
   Compiling futures-util v0.3.31
   Compiling subtle v2.6.1
   Compiling http-body v1.0.1
   Compiling libc v0.2.180
   Compiling want v0.3.1
   Compiling futures-channel v0.3.31
   Compiling compression-core v0.4.31
   Compiling flate2 v1.1.9
   Compiling block-buffer v0.10.4
   Compiling crypto-common v0.1.7
   Compiling utf8_iter v1.0.4
   Compiling socket2 v0.6.2
   Compiling shell-words v1.1.1
   Compiling digest v0.10.7
   Compiling static_assertions v1.1.0
   Compiling form_urlencoded v1.2.2
   Compiling cmake v0.1.57
   Compiling sync_wrapper v1.0.2
   Compiling kstring v2.0.2
   Compiling encoding_rs v0.8.35
   Compiling base64 v0.22.1
   Compiling sha1 v0.10.6
   Compiling ipnet v2.11.0
   Compiling tower-layer v0.3.3
   Compiling http-body-util v0.1.3
   Compiling sha1-checked v0.10.0
   Compiling compression-codecs v0.4.36
   Compiling iri-string v0.7.10
   Compiling zmij v1.0.19
   Compiling rustversion v1.0.22
   Compiling windows-sys v0.59.0
   Compiling winapi v0.3.9
   Compiling serde_json v1.0.149
   Compiling mime v0.3.17
   Compiling crossbeam-epoch v0.9.18
   Compiling filetime v0.2.27
   Compiling utf8parse v0.2.2
   Compiling anstyle v1.0.13
   Compiling mio v1.1.1
   Compiling arrayvec v0.7.6
   Compiling once_cell_polyfill v1.70.2
   Compiling rayon-core v1.13.0
   Compiling autocfg v1.5.0
   Compiling anstyle-wincon v3.0.11
   Compiling anstyle-parse v0.2.7
   Compiling crossbeam-deque v0.8.6
   Compiling uluru v3.1.0
   Compiling aws-lc-sys v0.37.0
   Compiling anstyle-query v1.1.5
   Compiling toml_parser v1.0.6+spec-1.1.0
   Compiling eyre v0.6.12
   Compiling colorchoice v1.0.4
   Compiling toml_writer v1.0.6+spec-1.1.0
   Compiling semver v1.0.27
   Compiling serde_spanned v1.0.4
   Compiling toml_datetime v0.7.5+spec-1.1.0
   Compiling owo-colors v4.2.3
   Compiling is_terminal_polyfill v1.70.2
   Compiling winapi-util v0.1.11
   Compiling jiff v0.2.18
   Compiling tempfile v3.24.0
   Compiling tokio v1.49.0
   Compiling fs-err v3.2.2
   Compiling same-file v1.0.6
   Compiling camino v1.2.2
   Compiling clru v0.6.2
   Compiling walkdir v2.5.0
   Compiling foldhash v0.1.5
   Compiling arc-swap v1.8.1
   Compiling toml v0.9.11+spec-1.1.0
   Compiling hashbrown v0.15.5
   Compiling anstream v0.6.21
   Compiling wasmparser v0.207.0
   Compiling either v1.15.0
   Compiling strsim v0.11.1
   Compiling fixedbitset v0.5.7
   Compiling binfarce v0.2.1
   Compiling heck v0.5.0
   Compiling powerfmt v0.2.0
   Compiling rustc-demangle v0.1.27
   Compiling topological-sort v0.2.2
   Compiling clap_lex v0.7.7
   Compiling lazy_static v1.5.0
   Compiling indenter v0.3.4
   Compiling home v0.5.11
   Compiling nu-ansi-term v0.50.3
   Compiling backtrace v0.3.76
   Compiling sharded-slab v0.1.7
   Compiling io-close v0.3.7
   Compiling clap_builder v4.5.57
   Compiling petgraph v0.8.3
   Compiling rayon v1.11.0
   Compiling deranged v0.5.5
   Compiling tracing-log v0.2.0
   Compiling toml-span v0.6.0
   Compiling thread_local v1.1.9
   Compiling num-conv v0.1.0
   Compiling twox-hash v2.1.2
   Compiling time-core v0.1.7
   Compiling bstr v1.12.1
   Compiling regex v1.12.3
   Compiling matchers v0.2.0
   Compiling ident_case v1.0.1
   Compiling rustc-stable-hash v0.1.2
   Compiling termcolor v1.4.1
   Compiling canonical-path v2.0.2
   Compiling wait-timeout v0.2.1
   Compiling display-error-chain v0.2.2
   Compiling synstructure v0.13.2
   Compiling quitters v0.1.0
   Compiling color-eyre v0.6.5
   Compiling gix-validate v0.11.0
   Compiling gix-error v0.0.0
   Compiling auditable-extract v0.3.5
   Compiling thiserror-impl v2.0.18
   Compiling zerofrom-derive v0.1.6
   Compiling yoke-derive v0.8.1
   Compiling zerovec-derive v0.11.2
   Compiling displaydoc v0.2.5
   Compiling serde_derive v1.0.228
   Compiling gix-chunk v0.5.0
   Compiling tracing-attributes v0.1.31
   Compiling maybe-async v0.2.10
   Compiling clap_derive v4.5.55
   Compiling time v0.3.45
   Compiling abscissa_derive v0.9.0

warning: aws-lc-sys@0.37.0: Environment Variable found 'CFLAGS': '-flto=thin -march=native'
warning: aws-lc-sys@0.37.0: Environment Variable found 'CARGO_ENCODED_RUSTFLAGS': '-Ctarget-cpu=native▼-Ccodegen-units=1'
warning: aws-lc-sys@0.37.0: Emitting configuration: cargo:rustc-cfg=universal
warning: aws-lc-sys@0.37.0: Building with: CC
warning: aws-lc-sys@0.37.0: Symbol Prefix: Some("aws_lc_0_37_0")
warning: aws-lc-sys@0.37.0: Target platform: 'x86_64-pc-windows-msvc'
warning: aws-lc-sys@0.37.0: Setting CFLAGS_x86_64_pc_windows_msvc: -flto=thin -march=native
warning: aws-lc-sys@0.37.0: Compilation of 'c11.c' succeeded - Ok(["C:\\Users\\WDAGUtilityAccount\\AppData\\Local\\Temp\\cargo-installVkwQqr\\x86_64-pc-windows-msvc\\release\\build\\aws-lc-sys-027252bcf838056f\\out\\out-c11\\e1bacabfea35bee3-c11.o"]).
warning: aws-lc-sys@0.37.0: Environment Variable found 'CC': 'clang'
warning: aws-lc-sys@0.37.0: Setting CC_x86_64_pc_windows_msvc: clang
warning: aws-lc-sys@0.37.0: Environment Variable found 'CXX': 'clang++'
warning: aws-lc-sys@0.37.0: Setting CXX_x86_64_pc_windows_msvc: clang++
warning: aws-lc-sys@0.37.0: Using flag: -ffile-prefix-map=C:\Users\WDAGUtilityAccount\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\aws-lc-sys-0.37.0=
warning: aws-lc-sys@0.37.0: Compilation of 'stdalign_check.c' succeeded - Ok(["C:\\Users\\WDAGUtilityAccount\\AppData\\Local\\Temp\\cargo-installVkwQqr\\x86_64-pc-windows-msvc\\release\\build\\aws-lc-sys-027252bcf838056f\\out\\out-stdalign_check\\e1bacabfea35bee3-stdalign_check.o"]).
warning: aws-lc-sys@0.37.0: Compilation of 'builtin_swap_check.c' succeeded - Ok(["C:\\Users\\WDAGUtilityAccount\\AppData\\Local\\Temp\\cargo-installVkwQqr\\x86_64-pc-windows-msvc\\release\\build\\aws-lc-sys-027252bcf838056f\\out\\out-builtin_swap_check\\e1bacabfea35bee3-builtin_swap_check.o"]).
error: failed to run custom build command for `aws-lc-sys v0.37.0`

Caused by:
  process didn't exit successfully: `C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release\build\aws-lc-sys-273d57a1223b91fc\build-script-main` (exit code: 101)
  --- stdout
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_PREFIX_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_PREFIX
  cargo:rerun-if-env-changed=AWS_LC_SYS_PREGENERATING_BINDINGS_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_PREGENERATING_BINDINGS
  cargo:rerun-if-env-changed=AWS_LC_SYS_EXTERNAL_BINDGEN_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_EXTERNAL_BINDGEN
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_ASM_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_ASM
  cargo:rerun-if-env-changed=AWS_LC_SYS_CFLAGS_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_CFLAGS
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=CFLAGS
  cargo:warning=Environment Variable found 'CFLAGS': '-flto=thin -march=native'
  cargo:rerun-if-env-changed=AWS_LC_SYS_PREBUILT_NASM_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_PREBUILT_NASM
  cargo:rerun-if-env-changed=AWS_LC_SYS_C_STD_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_C_STD
  cargo:rerun-if-env-changed=AWS_LC_SYS_CMAKE_BUILDER_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_CMAKE_BUILDER
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_PREGENERATED_SRC_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_PREGENERATED_SRC
  cargo:rerun-if-env-changed=AWS_LC_SYS_EFFECTIVE_TARGET_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_EFFECTIVE_TARGET
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_JITTER_ENTROPY_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_JITTER_ENTROPY
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_U1_BINDINGS_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_NO_U1_BINDINGS
  cargo:rerun-if-env-changed=CARGO_ENCODED_RUSTFLAGS
  cargo:warning=Environment Variable found 'CARGO_ENCODED_RUSTFLAGS': '-Ctarget-cpu=native▼-Ccodegen-units=1'
  cargo:warning=Emitting configuration: cargo:rustc-cfg=universal
  cargo:rustc-cfg=universal
  cargo:rerun-if-env-changed=AWS_LC_SYS_STATIC_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_STATIC
  cargo:rerun-if-env-changed=CARGO_FEATURE_SSL
  cargo:warning=Building with: CC
  cargo:warning=Symbol Prefix: Some("aws_lc_0_37_0")
  cargo:rerun-if-env-changed=CARGO_FEATURE_SSL
  cargo:warning=Target platform: 'x86_64-pc-windows-msvc'
  cargo:root=C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\x86_64-pc-windows-msvc\release\build\aws-lc-sys-027252bcf838056f\out
  cargo:warning=Setting CFLAGS_x86_64_pc_windows_msvc: -flto=thin -march=native
  OPT_LEVEL = Some(3)
  OUT_DIR = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\x86_64-pc-windows-msvc\release\build\aws-lc-sys-027252bcf838056f\out)
  TARGET = Some(x86_64-pc-windows-msvc)
  CARGO_ENCODED_RUSTFLAGS = Some(-Ctarget-cpu=native▼-Ccodegen-units=1)
  cargo:rerun-if-env-changed=VCINSTALLDIR
  VCINSTALLDIR = None
  cargo:rerun-if-env-changed=VSTEL_MSBuildProjectFullPath
  VSTEL_MSBuildProjectFullPath = None
  cargo:rerun-if-env-changed=VCToolsVersion
  VCToolsVersion = None
  cargo:rerun-if-env-changed=VSCMD_ARG_VCVARS_SPECTRE
  VSCMD_ARG_VCVARS_SPECTRE = None
  cargo:rerun-if-env-changed=WindowsSdkDir
  WindowsSdkDir = None
  cargo:rerun-if-env-changed=WindowsSDKVersion
  WindowsSDKVersion = None
  cargo:rerun-if-env-changed=LIB
  LIB = None
  PATH = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release;C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release\deps;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\x86_64-pc-windows-msvc\lib;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\LLVM\bin;C:\Users\WDAGUtilityAccount\.cargo\bin;C:\Users\WDAGUtilityAccount\AppData\Local\Microsoft\WindowsApps;;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin)
  cargo:rerun-if-env-changed=INCLUDE
  INCLUDE = None
  HOST = Some(x86_64-pc-windows-msvc)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-msvc
  CC_x86_64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_msvc
  CC_x86_64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = Some(clang)
  cargo:rerun-if-env-changed=CC_KNOWN_WRAPPER_CUSTOM
  CC_KNOWN_WRAPPER_CUSTOM = None
  RUSTC_WRAPPER = 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:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  CFLAGS_x86_64_pc_windows_msvc = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-msvc
  CFLAGS_x86_64-pc-windows-msvc = None
  OPT_LEVEL = Some(3)
  TARGET = Some(x86_64-pc-windows-msvc)
  CARGO_ENCODED_RUSTFLAGS = Some(-Ctarget-cpu=native▼-Ccodegen-units=1)
  cargo:rerun-if-env-changed=VCINSTALLDIR
  VCINSTALLDIR = None
  cargo:rerun-if-env-changed=VSTEL_MSBuildProjectFullPath
  VSTEL_MSBuildProjectFullPath = None
  cargo:rerun-if-env-changed=VCToolsVersion
  VCToolsVersion = None
  cargo:rerun-if-env-changed=VSCMD_ARG_VCVARS_SPECTRE
  VSCMD_ARG_VCVARS_SPECTRE = None
  cargo:rerun-if-env-changed=WindowsSdkDir
  WindowsSdkDir = None
  cargo:rerun-if-env-changed=WindowsSDKVersion
  WindowsSDKVersion = None
  cargo:rerun-if-env-changed=LIB
  LIB = None
  PATH = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release;C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release\deps;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\x86_64-pc-windows-msvc\lib;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\LLVM\bin;C:\Users\WDAGUtilityAccount\.cargo\bin;C:\Users\WDAGUtilityAccount\AppData\Local\Microsoft\WindowsApps;;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin)
  cargo:rerun-if-env-changed=INCLUDE
  INCLUDE = None
  HOST = Some(x86_64-pc-windows-msvc)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-msvc
  CC_x86_64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_msvc
  CC_x86_64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = Some(clang)
  cargo:rerun-if-env-changed=CC_KNOWN_WRAPPER_CUSTOM
  CC_KNOWN_WRAPPER_CUSTOM = None
  RUSTC_WRAPPER = 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:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  CFLAGS_x86_64_pc_windows_msvc = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-msvc
  CFLAGS_x86_64-pc-windows-msvc = None
  cargo:warning=Compilation of 'c11.c' succeeded - Ok(["C:\\Users\\WDAGUtilityAccount\\AppData\\Local\\Temp\\cargo-installVkwQqr\\x86_64-pc-windows-msvc\\release\\build\\aws-lc-sys-027252bcf838056f\\out\\out-c11\\e1bacabfea35bee3-c11.o"]).
  cargo:rerun-if-env-changed=AWS_LC_SYS_CC_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_CC
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=CC
  cargo:warning=Environment Variable found 'CC': 'clang'
  cargo:warning=Setting CC_x86_64_pc_windows_msvc: clang
  cargo:rerun-if-env-changed=AWS_LC_SYS_CXX_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=AWS_LC_SYS_CXX
  cargo:rerun-if-env-changed=CXX_x86_64_pc_windows_msvc
  cargo:rerun-if-env-changed=CXX
  cargo:warning=Environment Variable found 'CXX': 'clang++'
  cargo:warning=Setting CXX_x86_64_pc_windows_msvc: clang++
  OUT_DIR = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\x86_64-pc-windows-msvc\release\build\aws-lc-sys-027252bcf838056f\out)
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  TARGET = Some(x86_64-pc-windows-msvc)
  HOST = Some(x86_64-pc-windows-msvc)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  CFLAGS_x86_64_pc_windows_msvc = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-msvc
  CFLAGS_x86_64-pc-windows-msvc = None
  cargo:warning=Using flag: -ffile-prefix-map=C:\Users\WDAGUtilityAccount\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\aws-lc-sys-0.37.0=
  OPT_LEVEL = Some(3)
  TARGET = Some(x86_64-pc-windows-msvc)
  CARGO_ENCODED_RUSTFLAGS = Some(-Ctarget-cpu=native▼-Ccodegen-units=1)
  cargo:rerun-if-env-changed=VCINSTALLDIR
  VCINSTALLDIR = None
  cargo:rerun-if-env-changed=VSTEL_MSBuildProjectFullPath
  VSTEL_MSBuildProjectFullPath = None
  cargo:rerun-if-env-changed=VCToolsVersion
  VCToolsVersion = None
  cargo:rerun-if-env-changed=VSCMD_ARG_VCVARS_SPECTRE
  VSCMD_ARG_VCVARS_SPECTRE = None
  cargo:rerun-if-env-changed=WindowsSdkDir
  WindowsSdkDir = None
  cargo:rerun-if-env-changed=WindowsSDKVersion
  WindowsSDKVersion = None
  cargo:rerun-if-env-changed=LIB
  LIB = None
  PATH = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release;C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release\deps;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\x86_64-pc-windows-msvc\lib;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\LLVM\bin;C:\Users\WDAGUtilityAccount\.cargo\bin;C:\Users\WDAGUtilityAccount\AppData\Local\Microsoft\WindowsApps;;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin)
  cargo:rerun-if-env-changed=INCLUDE
  INCLUDE = None
  HOST = Some(x86_64-pc-windows-msvc)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-msvc
  CC_x86_64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_msvc
  CC_x86_64_pc_windows_msvc = Some(clang)
  cargo:rerun-if-env-changed=CC_KNOWN_WRAPPER_CUSTOM
  CC_KNOWN_WRAPPER_CUSTOM = None
  RUSTC_WRAPPER = 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:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  CFLAGS_x86_64_pc_windows_msvc = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-msvc
  CFLAGS_x86_64-pc-windows-msvc = None
  cargo:warning=Compilation of 'stdalign_check.c' succeeded - Ok(["C:\\Users\\WDAGUtilityAccount\\AppData\\Local\\Temp\\cargo-installVkwQqr\\x86_64-pc-windows-msvc\\release\\build\\aws-lc-sys-027252bcf838056f\\out\\out-stdalign_check\\e1bacabfea35bee3-stdalign_check.o"]).
  OPT_LEVEL = Some(3)
  TARGET = Some(x86_64-pc-windows-msvc)
  CARGO_ENCODED_RUSTFLAGS = Some(-Ctarget-cpu=native▼-Ccodegen-units=1)
  cargo:rerun-if-env-changed=VCINSTALLDIR
  VCINSTALLDIR = None
  cargo:rerun-if-env-changed=VSTEL_MSBuildProjectFullPath
  VSTEL_MSBuildProjectFullPath = None
  cargo:rerun-if-env-changed=VCToolsVersion
  VCToolsVersion = None
  cargo:rerun-if-env-changed=VSCMD_ARG_VCVARS_SPECTRE
  VSCMD_ARG_VCVARS_SPECTRE = None
  cargo:rerun-if-env-changed=WindowsSdkDir
  WindowsSdkDir = None
  cargo:rerun-if-env-changed=WindowsSDKVersion
  WindowsSDKVersion = None
  cargo:rerun-if-env-changed=LIB
  LIB = None
  PATH = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release;C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release\deps;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\x86_64-pc-windows-msvc\lib;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\LLVM\bin;C:\Users\WDAGUtilityAccount\.cargo\bin;C:\Users\WDAGUtilityAccount\AppData\Local\Microsoft\WindowsApps;;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin)
  cargo:rerun-if-env-changed=INCLUDE
  INCLUDE = None
  HOST = Some(x86_64-pc-windows-msvc)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-msvc
  CC_x86_64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_msvc
  CC_x86_64_pc_windows_msvc = Some(clang)
  cargo:rerun-if-env-changed=CC_KNOWN_WRAPPER_CUSTOM
  CC_KNOWN_WRAPPER_CUSTOM = None
  RUSTC_WRAPPER = 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:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  CFLAGS_x86_64_pc_windows_msvc = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-msvc
  CFLAGS_x86_64-pc-windows-msvc = None
  cargo:warning=Compilation of 'builtin_swap_check.c' succeeded - Ok(["C:\\Users\\WDAGUtilityAccount\\AppData\\Local\\Temp\\cargo-installVkwQqr\\x86_64-pc-windows-msvc\\release\\build\\aws-lc-sys-027252bcf838056f\\out\\out-builtin_swap_check\\e1bacabfea35bee3-builtin_swap_check.o"]).
  OPT_LEVEL = Some(3)
  OUT_DIR = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\x86_64-pc-windows-msvc\release\build\aws-lc-sys-027252bcf838056f\out)
  TARGET = Some(x86_64-pc-windows-msvc)
  CARGO_ENCODED_RUSTFLAGS = Some(-Ctarget-cpu=native▼-Ccodegen-units=1)
  cargo:rerun-if-env-changed=VCINSTALLDIR
  VCINSTALLDIR = None
  cargo:rerun-if-env-changed=VSTEL_MSBuildProjectFullPath
  VSTEL_MSBuildProjectFullPath = None
  cargo:rerun-if-env-changed=VCToolsVersion
  VCToolsVersion = None
  cargo:rerun-if-env-changed=VSCMD_ARG_VCVARS_SPECTRE
  VSCMD_ARG_VCVARS_SPECTRE = None
  cargo:rerun-if-env-changed=WindowsSdkDir
  WindowsSdkDir = None
  cargo:rerun-if-env-changed=WindowsSDKVersion
  WindowsSDKVersion = None
  cargo:rerun-if-env-changed=LIB
  LIB = None
  PATH = Some(C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release;C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr\release\deps;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\x86_64-pc-windows-msvc\lib;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\LLVM\bin;C:\Users\WDAGUtilityAccount\.cargo\bin;C:\Users\WDAGUtilityAccount\AppData\Local\Microsoft\WindowsApps;;C:\Users\WDAGUtilityAccount\.rustup\toolchains\stable-x86_64-pc-windows-msvc\bin)
  cargo:rerun-if-env-changed=INCLUDE
  INCLUDE = None
  HOST = Some(x86_64-pc-windows-msvc)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-msvc
  CC_x86_64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_msvc
  CC_x86_64_pc_windows_msvc = Some(clang)
  cargo:rerun-if-env-changed=CC_KNOWN_WRAPPER_CUSTOM
  CC_KNOWN_WRAPPER_CUSTOM = None
  RUSTC_WRAPPER = 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:rerun-if-env-changed=CFLAGS
  CFLAGS = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  CFLAGS_x86_64_pc_windows_msvc = Some(-flto=thin -march=native)
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-msvc
  CFLAGS_x86_64-pc-windows-msvc = None

  --- stderr

  thread 'main' (6048) panicked at C:\Users\WDAGUtilityAccount\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\aws-lc-sys-0.37.0\builder\cc_builder.rs:692:9:
  COMPILER: clangARGS: ["-O3", "-ffunction-sections", "-fdata-sections", "-m64", "--target=x86_64-pc-windows-msvc", "-flto=thin", "-march=native", "-flto=thin", "-march=native", "C:\\Users\\WDAGUtilityAccount\\.cargo\\registry\\src\\index.crates.io-1949cf8c6b5b557f\\aws-lc-sys-0.37.0\\aws-lc\\tests\\compiler_features_tests\\memcmp_invalid_stripped_check.c", "-Wno-unused-parameter", "-o", "C:\\Users\\WDAGUtilityAccount\\AppData\\Local\\Temp\\cargo-installVkwQqr\\x86_64-pc-windows-msvc\\release\\build\\aws-lc-sys-027252bcf838056f\\out\\memcmp_invalid_stripped_check"]EXECUTED: trueERROR: clang: error: LTO requires -fuse-ld=lld
  OUTPUT: Failed to compile memcmp_invalid_stripped_check

  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: failed to compile `cargo-audit v0.22.1`, intermediate artifacts can be found at `C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cargo-installVkwQqr`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_BUILD_BUILD_DIR` to that path.

[yoavwizstein]

@justsmth or @justinwsmith
I guess this: aws/aws-lc#3133
would solve that? I guess would also require a submodule update here

[justsmth]

Thanks for the report!

The cause is our memcmp_check inherits CFLAGS when compiling and linking its test binary. With -flto=thin, Clang on Windows requires -fuse-ld=lld for the link step, which isn't present, causing the failure you're seeing.

The check actually only needs -O3 to trigger the bug it's detecting, so I posted a PR (#1134 ) to have this check ignore CFLAGS entirely. This matches what the CMake build does.

As a workaround until the next release, you could set AWS_LC_SYS_CMAKE_BUILDER=1 to use the CMake build path, which shouldn't have this issue.

[AngelicosPhosphoros]

Thanks!