couldn't load codegen backend on windows-gnu

[sailfish009]

win7_64 msys64

$ ./x.py install
Updating only changed submodules
Submodules updated in 1.12 seconds
Finished dev [unoptimized] target(s) in 1.98s
Building stage0 std artifacts (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu)
Finished release [optimized] target(s) in 1.75s
Copying stage0 std from stage0 (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu / x86_64-pc-windows-gnu)
Building stage0 test artifacts (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu)
Finished release [optimized] target(s) in 0.63s
Copying stage0 test from stage0 (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu / x86_64-pc-windows-gnu)
Building stage0 compiler artifacts (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu)
Finished release [optimized] target(s) in 2.89s
Copying stage0 rustc from stage0 (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu / x86_64-pc-windows-gnu)
Building stage0 codegen artifacts (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu, llvm)
warning: In file included from ../rustllvm/rustllvm.h:5,
warning: from ../rustllvm/PassWrapper.cpp:6:
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h: In instantiation of 'llvm::ArrayRef::ArrayRef(const std::initializer_list<_Tp>&) [with T = long long unsigned int]':
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/IR/DIBuilder.h:645:74: required from here
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h:102:37: warning: initializing 'llvm::ArrayRef::Data' from 'std::initializer_list::begin' does not extend the lifetime of the underlying array [-Winit-list-lifetime]
warning: 102 | : Data(Vec.begin() == Vec.end() ? (T*)nullptr : Vec.begin()),
warning: In file included from ../rustllvm/rustllvm.h:5,
warning: from ../rustllvm/RustWrapper.cpp:1:
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h: In instantiation of 'llvm::ArrayRef::ArrayRef(const std::initializer_list<_Tp>&) [with T = long long unsigned int]':
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/IR/DIBuilder.h:645:74: required from here
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h:102:37: warning: initializing 'llvm::ArrayRef::Data' from 'std::initializer_list::begin' does not extend the lifetime of the underlying array [-Winit-list-lifetime]
warning: 102 | : Data(Vec.begin() == Vec.end() ? (T*)nullptr : Vec.begin()),
warning: In file included from ../rustllvm/rustllvm.h:5,
warning: from ../rustllvm/ArchiveWrapper.cpp:1:
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h: In instantiation of 'llvm::ArrayRef::ArrayRef(const std::initializer_list<_Tp>&) [with T = long long unsigned int]':
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/IR/DIBuilder.h:645:74: required from here
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h:102:37: warning: initializing 'llvm::ArrayRef::Data' from 'std::initializer_list::begin' does not extend the lifetime of the underlying array [-Winit-list-lifetime]
warning: 102 | : Data(Vec.begin() == Vec.end() ? (T*)nullptr : Vec.begin()),
warning: In file included from C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/Linker/IRMover.h:13,
warning: from C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/Linker/Linker.h:14,
warning: from ../rustllvm/Linker.cpp:1:
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h: In instantiation of 'llvm::ArrayRef::ArrayRef(const std::initializer_list<_Tp>&) [with T = long long unsigned int]':
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/IR/DIBuilder.h:645:74: required from here
warning: C:/msys64/work/rust/src/llvm-project/llvm/include/llvm/ADT/ArrayRef.h:102:37: warning: initializing 'llvm::ArrayRef::Data' from 'std::initializer_list::begin' does not extend the lifetime of the underlying array [-Winit-list-lifetime]
warning: 102 | : Data(Vec.begin() == Vec.end() ? (T*)nullptr : Vec.begin()),
Finished release [optimized] target(s) in 0.48s
Assembling stage1 compiler (x86_64-pc-windows-gnu)
Building stage1 std artifacts (x86_64-pc-windows-gnu -> x86_64-pc-windows-gnu)
Compiling core v0.0.0 (C:\msys64\work\rust\src\libcore)
Compiling compiler_builtins v0.1.15
error: couldn't load codegen backend "C:\msys64\work\rust\build\x86_64-pc-windows-gnu\stage1\lib\rustlib\x86_64-pc-windows-gnu\codegen-backends\rustc_codegen_llvm-llvm.dll": "The specified procedure could not be found. (os error 127)"

error: Could not compile core.
warning: build failed, waiting for other jobs to finish...
error: build failed
command did not execute successfully: "C:\msys64\work\rust\build\x86_64-pc-windows-gnu\stage0\bin\cargo.exe" "build" "--target" "x86_64-pc-windows-gnu" "-j" "4" "--release" "--features" "panic-unwind backtrace compiler-builtins-c" "--manifest-path" "C:\msys64\work\rust\src/libstd/Cargo.toml" "--message-format" "json"
expected success, got: exit code: 101
failed to run: C:/msys64/work/rust/build/bootstrap/debug/bootstrap install
Build completed unsuccessfully in 0:00:33

[sailfish009]

i found that, unlike stage0, in stage1 not copy following 3 files:

libgcc_s_seh-1.dll
libstdc++-6.dll
libwinpthread-1.dll

C:>dumpbin /dependents C:\msys64\work\rust\build\x86_64-pc-windows-gnu\st
age1\lib\rustlib\x86_64-pc-windows-gnu\codegen-backends\rustc_codegen_llvm-
llvm.dll
Microsoft (R) COFF/PE Dumper Version 14.22.27706.1
Copyright (C) Microsoft Corporation. All rights reserved.

Dump of file C:\msys64\work\rust\build\x86_64-pc-windows-gnu\stage1\lib\
rustlib\x86_64-pc-windows-gnu\codegen-backends\rustc_codegen_llvm-llvm.dll

File Type: DLL

Image has the following dependencies:

ADVAPI32.dll
KERNEL32.dll
msvcrt.dll
ole32.dll
SHELL32.dll
libgcc_s_seh-1.dll
libstdc++-6.dll
std-628b34239afd544d.dll
rustc_cratesio_shim-1286e1e1e25e9401.dll
rustc_data_structures-2fe798d50cc1988d.dll
arena-6a0e10874a3e95a7.dll
syntax_pos-7d77f4de5c784c3b.dll
rustc_errors-75e0d9f7a3216c59.dll
rustc_target-afb73b93701b273b.dll
syntax-1b86f5297a43462e.dll
rustc_fs_util-51440b05ae415ecd.dll
rustc-7f75934bde937904.dll
rustc_allocator-efb755307bc90225.dll
rustc_incremental-217d1250b4277d9a.dll
rustc_codegen_utils-df25ac251788eeee.dll
rustc_codegen_ssa-26e20ca0ffb36a8b.dll

Summary

    1000 .CRT
    2000 .bss
   75000 .data
    8000 .debug_abbrev
    1000 .debug_aranges
    3000 .debug_frame
   85000 .debug_info
   12000 .debug_line
   2B000 .debug_loc
    2000 .debug_ranges
    2000 .debug_str
  3EF000 .edata
   19000 .idata
   A5000 .pdata
  FC0000 .rdata
   39000 .reloc
   79000 .rustc
 2337000 .text
    1000 .tls
   E3000 .xdata

[YairHalberstadt]

I have the same issue: https://stackoverflow.com/questions/56473344/couldnt-load-codegen-backend-when-compiling-rust-on-windows-using-mingw-64

[sailfish009]

replace llvm with old / latest version in my private repo (which works fine 2019-5-18 in another computer), result same error.

[sailfish009]

found the reason, latest mingw gcc 9.1.0 cause some missing dll problem. (although, compile rust source was fine).

if you have old version msys2, this will works for you:

pacman -R mingw-w64-x86_64-gcc mingw-w64-x86_64-cmake
pacman -R mingw-w64-x86_64-gcc-libs
pacman -U /var/cache/pacman/pkg/mingw-w64-x86_64-gcc-libs-8.3.0-2-any.pkg.tar.xz
pacman -U /var/cache/pacman/pkg/mingw-w64-x86_64-gcc-8.3.0-2-any.pkg.tar.xz
pacman -U /var/cache/pacman/pkg/mingw-w64-x86_64-cmake-3.14.4-1-any.pkg.tar.xz

./x.py install
rustc -vV
rustc 1.37.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-pc-windows-gnu
release: 1.37.0-dev
LLVM version: 8.0

[mati865]

This issue is not fixed and shouldn't have been closed.

[sailfish009]

@mati865 Technically correct, but rust is compiled fine with gcc 8.3 version.
only problem with gcc 9.x, may be rust need to be modified with gcc 9.x syntax.

[mati865]

Ntldd output:

$ ntldd /d/Projects/rust/build/x86_64-pc-windows-gnu/stage1/lib/rustlib/x86_64-pc-windows-gnu/codegen-backends/rustc_codegen_llvm-llvm.dll
        std-1bafbda090a28ede.dll => not found
        fmt_macros-b2c296fbc2d2182c.dll => not found
        rustc_driver-acfddf0893838c24.dll => not found
        ADVAPI32.dll => C:\WINDOWS\SYSTEM32\ADVAPI32.dll (0x000000000ab10000)
        KERNEL32.dll => C:\WINDOWS\SYSTEM32\KERNEL32.dll (0x000000000abb0000)
        msvcrt.dll => C:\WINDOWS\SYSTEM32\msvcrt.dll (0x000000000abb0000)
        ole32.dll => C:\WINDOWS\SYSTEM32\ole32.dll (0x000000000ab10000)
        SHELL32.dll => C:\WINDOWS\SYSTEM32\SHELL32.dll (0x000000000af70000)
        libgcc_s_seh-1.dll => D:\msys64\mingw64\bin\libgcc_s_seh-1.dll (0x0000000000080000)
        libstdc++-6.dll => D:\msys64\mingw64\bin\libstdc++-6.dll (0x000000000ab10000)

Missing libraries can be found inside /d/Projekty/rust/build/x86_64-pc-windows-gnu/stage1/bin so probably something weird happens to PATH during rustbuild.

Nightly doesn't depend on fmt_macros:

$ ntldd /c/Users/mateusz/.rustup/toolchains/nightly-x86_64-pc-windows-gnu/lib/rustlib/x86_64-pc-windows-gnu/codegen-backends/rustc_codegen_llvm-llvm.dll
        std-542b4eb673c8859b.dll => not found
        rustc_driver-dc847589f2996fc8.dll => not found
        ADVAPI32.dll => C:\WINDOWS\SYSTEM32\ADVAPI32.dll (0x0000000006190000)
        libgcc_s_seh-1.dll => D:\msys64\mingw64\bin\libgcc_s_seh-1.dll (0x00000000001c0000)
        KERNEL32.dll => C:\WINDOWS\SYSTEM32\KERNEL32.dll (0x0000000006230000)
        msvcrt.dll => C:\WINDOWS\SYSTEM32\msvcrt.dll (0x0000000006230000)
        ole32.dll => C:\WINDOWS\SYSTEM32\ole32.dll (0x0000000006190000)
        SHELL32.dll => C:\WINDOWS\SYSTEM32\SHELL32.dll (0x00000000065f0000)
        libstdc++-6.dll => D:\msys64\mingw64\bin\libstdc++-6.dll (0x0000000006190000)